XM0 - Volume flow MODBUS   | TROX GmbH
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Compact controller XM0 for TVE and TVE-Q
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Bus interface Modbus RTU

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Control component for type TVE

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VAV control unit variant TVE-Q-P1 (powder-coated)

Control component for type TVE-Q

Control component for type TVE-Q

XM0_mit_Kappe_querpsd.png
Modbus_XM0png.png
XS0_img_01png.png
TVE-Q_-P1_img_02psd.png

XM0  

Control component with dynamic transducer and Modbus RTU interface

Compact unit for VAV control unit TVE and TVE-Q

  • Controller, dynamic effective pressure transducer and actuator in one casing
  • Use in ventilation and air conditioning systems, only with clean air
  • Simple terminal connection, no connection box required
  • Volume flow rates qvmin and qvmax factory preset and stored in the controller as variable parameters
  • High data transparency through standardised bus communication Modbus RTU, RS485
  • Setpoint presets, override controls, parameter adjustment via Modbus registers
  • Integrated display for volume flow rate display, operating status display and setting of operating parameters
  • Service access for manual adjustment devices and PC configuration software

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General Information

Application

  • Complete control units for VAV control units types TVE and TVE-Q
  • Dynamic differential pressure transducer, electronic controller, and actuator are fitted together in one casing
  • Dynamic transducer for clean air in ventilation and air conditioning systems
  • Standard filtration in comfort conditioning systems allows for use of the controller in the supply air without additional dust protection
  • Choice of various control options based on setpoint value default setting
  • Volume flow rate control is based on setpoint values received from room temperature controller, central BMS, air quality controller or other devices as an analogue signal or via communication interface
  • Override controls for activating qvmin, qvmax, shut-off, open position via Modbus register or switch or relay possible
  • The actual volume flow rate is available as a network data point or as a linear voltage signal
  • Damper blade position is available as a network data point

With heavy dust levels in the room

  • Install suitable extract air filters upstream, as a partial volume flow is routed through the transducer for volume flow rate measurement

If the air is contaminated with dust, lint or sticky particles:

  • Use module XS0 instead of the Compact controller XM0 described here


Control strategy



  • The volume flow controller works independent of the duct pressure
  • Pressure fluctuations do not result in permanent volume flow rate changes
  • To prevent the control from becoming unstable, a dead band (hysteresis) is allowed within which the damper blade does not move.
  • Flow rate range in the controller set in the factory (qvmin: minimum volume flow rate, qvmax: maximum volume flow rate)
  • Operating parameters are specified via the order code and set in the factory



Operating modes

  • Modbus (M): Setpoint specification via Modbus registers
  • Analogue - variable operation (V): Setpoint input via analogue interface, signal voltage range corresponds to qvmin to qvmax

  • Analogue - fixed value operation (F): no setpoint signal required, setpoint corresponds to qvmin


Interface

Communication interface

  • Modbus RTU, RS485
  • Data points see Modbus register list

Analogue interface with adjustable signal voltage range

  • Analogue signal for volume flow setpoint
  • Analogue signal for actual volume flow rate (factory setting)
  • Alternatively: analogue signal for damper position (on-site conversion required)

Note:

  • Interface type preset at the factory according to operating mode
  • Can be adapted on site via communication interface (Modbus register) or display operation.


Signal voltage ranges



When using the analogue interface

  • 0 – 10 V DC
  • 2 – 10 V DC



Parts and characteristics

  • Transducer for dynamic measurement principle
  • Overload protection
  • Terminals with cover
  • Display and control elements for simple menu guidance
  • Menu guidance for adjusting operating parameters and communication interface
  • Service interface



Construction

  • TR0VM-024T-05I-DD15-MB
  • Only applicable for types TVE and TVE-Q


Commissioning



  • Due to the volume flow rates set in the factory, always ensure that the control units are only installed in the specified locations
  • Analogue interface: ready for use after installation and wiring
  • Modbus interface: additional commissioning steps required
  • Operating parameters can be adjusted by the customer (using the display panel, adjustment device or Modbus register)




Useful additions

  • Adjustment device type GUIV3-M  (order code AT-VAV-G3)


Technical information

Function, Specification text, Order code

  • Function
  • SPECIFICATION TEXT
  • ORDER CODE
XS0_dia_01ai.png

① Differential pressure transducer
② Actuator
③ Volume flow controller
④ Setpoint via Modbus or analogue signal
⑤ Shaft with effective pressure channel

VAV terminal units control the volume flow in a closed loop, i.e. measurement – comparison – correction.
For volume flow rate measurement the effective pressure is measured first. This is done with a differential pressure sensor. The integral differential pressure transducer transforms the effective pressure into a voltage signal. The actual volume flow rate is available as a voltage signal. The factory setting is such that 10 V DC always corresponds to the nominal flow rate (qvnom).
The volume flow rate setpoint value comes from a higher-level controller (e.g. room temperature controller, air quality controller, central BMS). Variable volume flow control results in a value between qvmin and qvmax. It is possible to override the room temperature control, e.g. by a complete shut-off of the duct.
The controller compares the differential pressure setpoint value to the actual value and controls the actuator accordingly if there is a difference.


Category

  • Compact controller for volume flow rate
  • Control of a constant or variable volume flow rate setpoint
  • Electronic controller for the connection of a reference variable and tapping of an actual value for integration into a Modbus-based building management system
  • The actual value relates to the nominal volume flow rate so that commissioning and subsequent adjustment are simplified


Application

  • Dynamic transducer for clean air in ventilation and air conditioning systems
  • Modbus commands (Modbus operating mode)
  • External switching contacts/wiring (with analogue interface)


Supply voltage


  • 24 V AC/DC


Actuator


  • Integrated; slow-running (running time 100 s for 90°)


Installation orientation


  • Either direction


Interface/signalling


  • Modbus RTU (RS-485) or alternative analogue signals (0 – 10V or 2 – 10V DC) can be used
  • Interface type preset in the factory on the basis of the order code


Connection


  • Terminals with cover by rubber cap, therefore no additional terminal box required
  • Double terminal for supply voltage for easy further wiring of up to 3 controllers


Interface information

  • Modbus: among other things, volume flow setpoint and actual value signal, damper position, override control
  • Alternative: Volume flow setpoint and actual value signal as analogue signal


Special functions


  • Clearly visible external indicator light for signalling the functions: Set, not set, and power failure
  • Display for actual values, parameterisation and for test functions
  • Activation qvmin, qvmax, closed, open by: Modbus (with Modbus control), external switch contacts (with analogue control)


Parameter setting


  • Parameters specific to VAV terminal unit set at the factory
  • Operating values: qvmin, qvmax and interface type set in the factory
  • Subsequent adjustment via display and control element directly on the device or with optional tools: adjustment device, PC software (wired in each case), in Modbus mode as well as via Modbus register access


Factory condition


  • Electronic controller factory set on control unit
  • Factory setting of parameters
  • Functional test under air; certified with sticker


TVED / 200 / D2 / XM0 / V0 / qvminqvmaxm³/h
|||||||||
12567891011
1 Type
TVE VAV terminal unit
 
2 Acoustic cladding

No entry: none
D With acoustic cladding
 
3 Material
Galvanised sheet steel (standard construction)
P1 Powder-coated RAL 7001, silver grey
A2 Stainless steel construction
 
5 Nominal size [mm]
100, 125, 160, 200, 250, 315, 400
 
Accessories 6
No entry: none
D2 Double lip seal both ends
G2 Matching flanges for both ends


 
7 Attachments (control component)
XM0 Compact controller dynamic transmitter, Modbus RTU, display
 
8 Operating mode
F Constant value (one setpoint value)
V Variable (setpoint value range)
M Modbus RTU
 
9 Signal voltage range (only with operating mode F, V)
0 0 – 10 V DC
2 2 – 10 V DC
 
10 Operating values for factory setting
Volume flow rates in m³/h or l/s
qvconst (only with operating mode F)
qvmin (only with operating mode V, M)
qvmax (only with operating mode V, M)
 
11 Volume flow rate unit
m³/h
l/s

Order example: TVE/100/D2/XM0/M/20-350 m³/h

Acoustic claddingWithout
MaterialGalvanised sheet steel
Nominal size100 mm
AccessoriesDouble lip seal both sides
AttachmentCompact controller Modbus, dynamic transducer
Operating modeModbus RTU
Volume flow rate20 – 350 m³/h
 

Variants, Product details

  • VARIANTS
  • PRODUCT DETAILS


Product details

Modbus operation (operating mode M in the order code)


A smooth exchange of data in the Modbus RTU network (network by others) requires that the communication parameters and the user address for the Modbus interface are set.
The interface offers standardised Modbus register access to the available data points by means of the ReadHoldingRegister (3) and WriteSingleRegister (6) functions.




Setpoint value setting


  • In operating mode M, the setpoint is only specified by specifying the volume flow setpoint [%] in Modbus register 0
  • The percentage value refers to the volume flow rate range specified by qvmin - qvmax defined volume flow rate range
  • Volume flow rate range qvmin - qvmax set at the factory according to the order code details
  • Subsequent adjustment of qvmin or qvmax possible in the setting menu on the display, with setting device or via Modbus interface

Note:


Cyclic writing to registers with storage in the EEPROM is not permitted.
This applies in particular to the basic setting parameters for the working range qvmin (register 105) , qvmax (Register 106)
and the definition of the interface type (register 122) as well as all other registers from number 100.



Actual value as feedback for monitoring or tracking control


  • In Modbus register 7, the current actual volume flow can be called up in the set volumetric flow unit (register 201)
  • In addition to the actual volume flow rate, further information can be read out via other Modbus registers;
    Overview see register list
  • For diagnostic purposes, the actual volume flow rate can be tapped at terminal U in Modbus mode
  • The volume flow rate range 0 – qvnom always corresponds to the signal voltage range of 2 - 10V DC


Override control


For special operating situations, the volume flow controller can be set to a special operating state (override control). The following modes are possible: control qvmin, control qvmax, control damper in open position (OPEN) or control damper closed (CLOSED).



Override control via the Modbus

Specifications are made via Modbus register 1.


Override control through bus failure monitoring


If Modbus communication fails for a specified period of time, a predefined operating state qvmin, qvmax, OPEN or CLOSED can be activated.


  • The override control to be activated in case of bus failure is defined via register 108
  • The determination after which bus failure time the override control is activated is made via register 109
  • Any Modbus communication resets the bus failure monitoring timeout


Override controls for diagnosis


Activation via the diagnostic menu on the controller display or via the service tools (setting device, PC software).



Prioritisation of different default options


Specifications for override controls via service tools are prioritised over Modbus specifications.


  • Highest priority: Defaults coming from a service tool (service connector), e.g. adjustment device or PC software, for test purposes
  • Lowest priority: Defaults coming from Modbus 1 or the diagnosis menu on the controller

Note:
Cyclic writing to registers with storage in the EEPROM is not permitted. This applies in particular to the basic setting parameters for the working range qvmin (register 105 or 120), qvmax (register 106 or 121), the definition of the interface type (register 122) and all other registers from number 100.
See also notes on writeability at the end of the Modbus register description.


,

Analogue operation 0 - 10V DC or 2 - 10V DC (order code, operating mode V, F)


The analogue interface can be set for the signal voltage range 0 - 10V DC or 2 - 10V DC.
The assignment of volume flow setpoint or actual value to voltage signals is shown in the characteristic diagrams.


  • The set signal voltage range applies to both setpoint value and actual value signals.
  • The signal voltage range is set in the factory according to the order code
  • Signal voltage range can be adjusted on site in the setting menu on the display or with the setting device


Setpoint value setting


  • In operating mode V (variable operation), the setpoint is only specified with an analogue signal at terminal Y
    • Setpoint specifications via Modbus register 0 are rejected
  • Selected signal voltage range 0 - 10V or 2 - 10V DC is adjusted to the set volume flow rate range qvmin – qvmax assigned to
  • Volume flow rate range qvmin – qvmax set at the factory according to the order code details
  • Subsequent adjustment of qvmin or qvmax possible in the setting menu on the display or with the setting device
  • In operating mode F (fixed value operation), no analogue signal is required at terminal Y
  • The value given by qvmin is controlled through the fixed volume flow rate
  • Volume flow qvmin set at the factory according to the order code details
  • Subsequent adjustment of qvmin possible in the setting menu on the display or with the setting device


Actual value as feedback for monitoring or tracking control


  • The actual volume flow rate measured by the controller can be captured as a voltage signal at terminal U
  • The selected signal voltage range 0 – 10 V DC or 2 – 10 V DC is mapped to the volume flow rate range 0 – qvnom shown
  • In analogue mode (operating mode V, F), there is the parallel option of querying operating data via the Modbus interface


Override control


For special operating situations, the volume flow controller can be set to a special operating state (override control). The following modes are possible: control qvmin, control qvmax, control damper in open position (OPEN) or control damper closed (CLOSED).



Override controls via signal input Y
With suitable wiring at signal input Y, the override controls can be activated according to the wiring diagrams by wiring with external switching contacts/relays (see wiring examples). OPEN and CLOSE are only available if the controller is supplied with alternating current (AC).



Override control CLOSE using signal input Y


  • With signal voltage range 0 - 10 V DC and qvmin = 0: CLOSE is activated when command signal Y < 0.3 V DC
  • With signal voltage range 0 - 10 V DC and qvmin > 0: No shut-off possible
  • With signal voltage range 2 - 10 V DC and qvmin = 0: CLOSE is activated when command signal Y < 2.3 V DC
  • With signal voltage range 2 - 10 V DC and qvmin > 0: CLOSE is activated when command signal Y < 0.8 V DC
    Between 0.9 V and 2 V, qvmin regulated.


Override controls in analogue mode via Modbus interface


If the Modbus interface is also connected in analogue mode, override control can also be specified via Modbus register 1.

Override control for diagnosis
Activation via the diagnostic menu on the controller display or the service tools (setting device, PC software).

Prioritisation of different default options
Various override options are prioritised by the controller as follows:


  • Highest priority: Defaults coming from a service tool (service connector), e.g. adjustment device or PC software, for test purposes
  • Medium priority: Specifications via Modbus register 1 or the diagnostics menu on the controller
  • Lowest priority: Specifications via wiring at the Y-signal input of the controlle

Technical data

  • TECHNICAL DATA

Compact controllers for VAV terminal units

Part number

Type of installation componentVAV terminal units
A00000069230TR0VM-024T-05I-DD15-MBTVE, TVE-Q

TR0VM-024T-05I-DD15-MB

Measurement principle/installation orientationDynamic measurement principle, position-independent
Supply voltage (AC)24 V AC, ± 20 %, 50/60 Hz
Supply voltage (DC)24 V DC ± 20 %
Power rating (AC)TVE NW 100 - 200: maximum 4 VA
TVE NW 250 - 400: maximum 7 VA
TVE-Q up to height 200: maximum 4 VA
TVE-Q from height 300: maximum 7 VA
Power rating (DC)TVE NW 100 - 200: maximum 2.5 W
TVE NW 250 - 400: maximum 4 W
TVE-Q up to height 200: maximum 2.5 W
TVE-Q from height 300: maximum 4 W
Power consumption (when running/when idle)

1 W

Setpoint value signal input (analogue optional)0 - 10 V DC, input resistance > 100 kΩ
or 2 - 10V DC Ra> 50 kΩ
Actual value signal output

0 - 10 V DC or 2 - 10 V DC; maximum 5 mA

IEC protection classIII (protective extra-low voltage)
Protection levelIP 42 (with the terminal cover attached)
EC conformityEMC to 2014/30/EU
Bus connectionModbus RTU, RS485
Number of nodes128
Adjustable communication parameters1200 – 115,200 Bd
Start bit: 1
Data bits: 8
Stop bits: 1 or 2
Parity: None, Even, Odd
Setpoint / actual value interface (Modbus)via Modbus register list
Cable terminationExternally required

 Interface configuration of control components

Depending on the setting, the Modbus communication interface or the analogue interface are available for the setpoint value specification of volume flow rates. Interface mode is pre-set at the factory according to the order code and can be adjusted by others by setting the menu guidance or the Modbus register.


Typical interface configuration

Setpoint value default setting via:Actual values via:Corresponds to order key optionMenu configuration (Mode)
Analogue operationanalogue 0 - 10 Vanalogue 0 - 10 VV or FCA0
Analogue operationanalogue 2 - 10 Vanalogue 2 - 10 VV or FCA2
Modbus operationModbus register setpointModbus register actual value or analogue 2 - 10 VMCB

By special configuration of the Modbus register Interface-Mode, mixed operations of Modbus operation and analogue operation can be configured. See the description of the interface mode in Modbus register 122.


Supplementary use of the Modbus interface in analogue mode


In analogue mode, only the setpoints at the analogue input are evaluated by the controller. A setpoint specification via the Modbus interface (register 0) is not possible. Any write attempts are acknowledged with an error response. Regardless of the selected interface configuration, however, the other Modbus registers can be used. In this way, the operating values of the actual volume flow rate and damper position can be read out from a higher-level building management system (BMS) with local control using an analogue signal via a connected Modbus, or central override controls can also be triggered.


Communication interface Modbus RTU (operating mode M)

Register

MeaningAccess rightStorage

0

Volume flow setpoint [%]
Reference: Vmin – Vmax (qvmin – qvmax)
Resolution: 0 – 10000
Volume flow setpoint: 0.00 - 100.00%
R, WRAM
1Activation of an override control; 0 = None; 1 = Open; 2 = Close; 3 = Vmin; 4 = VmaxR, WRAM
2Command triggering 0 = none; 1 = adaptation; 2 = test run; 4 = controller resetR, WRAM
4Current damper blade position [%]
Resolution: 0 – 10000
Damper blade position: 0.00 – 100.00%
RRAM
5Current damper blade position [°]
Reference: without decimal places
RRAM
6Current actual volume flow rate [%]
Resolution: Vnom
Resolution: 0 – 10000
Actual volume flow rate: 0.00 - 100.00%
RAM
7Actual volume flow rate in volume flow unit [m³/h], [l/s], [cfm] acc. Register 201RRAM
8Voltage at analogue input Y [mV]RRAM

20

Volume flow setpoint
in volume flow unit [m3/h], [l/s], [cfm]
acc. to register 201

R, W

RAM

103Firmware versionR

Flash


105Operating range limitation: Operating parameter Vmin (qvmin) [%]
Resolution: Vnom
Resolution: 0 – 10000
Vmin: 0.00 – 100.00%
R, WEEPROM
106Operating range limitation: Operating parameter Vmax (qvmax) [%]
Resolution: Vnom
Resolution: 0 – 10000
Vmax: 0.00 – 100.00%
R, WEEPROM
108Behaviour in case of bus timeout; 0 = none; 1 = close; 2 = open; 3 = qvmin; 5 = qVmaxR, WEEPROM
109Definition of bus timeout [s]R, WEEPROM
120Definition of operating range: operating parameter Vmin (qvmin) in volume flow unit [m³/h], [l/s], [cfm] acc. register 201R, WEEPROM
121Definition of operating range: operating parameters Vmax (qvmax) in volume flow unit [m³/h], [l/s], [cfm] acc. Register 201R, WEEPROM
122Interface definition (Interface mode) For assignment see separate tableR, WEEPROM


130 *


Modbus address (device address)R, WEEPROM
201Volume flow unit 0 = l/s; 1 = m³/h; 6 = cfmR, WEEPROM
231Setting of mode:
Bit 0 defines the characteristic of the analogue interface.
Bit 0 = 0 characteristic: 0 – 10 V
Bit 0 = 1 characteristic: 2 – 10 V
Bit 4 defines the actual value signal as actual volume flow rate or damper position.
Bit 4 = 0 Actual volume flow rate
Bit 4 = 1 Damper blade position
All other bits must not be changed.
R, WEEPROM
568

Modbus parameter kit communication settings: baud rate, parity, stop bits, assignment see separate table


R, WEEPROM
569Modbus communication settings: Modbus Response Time = 10 ms + delay; with delay= 3 ms × register value 0 – 255R, WEEPROM
572Setting of switching threshold for override control CLOSE via control signal for signal voltage range 2 – 10 V:
Setting range 0.5 V – 1.8 V
Default value 0.8V (register value = 20)
Resolution: 1 setting unit = 40mV
R, WEEPROM
104Status information
Bit 5 mechanical overload
Bit 8 internal activity e.g. test run, adaptation
Bit 10 bus timeout monitoring triggered
RRAM

* Factory setting: Modbus address 1

R = register readable

R,W = register readable and writable

RAM = register value volatile

EEPROM = register value not volatile, but permanently stored (maximum 1 million write operations)

Note:

All registers from register number 100 with storage in the EEPROM are not designed for cyclical write access, e.g. by the building management system. Cyclic write operations are only permitted on registers with storage in RAM.


 Detailed information on register 122 (communication interface setpoint/actual value - interface mode)

Communication interface/Interface mode

Storage

Register value

Signal inputFeedback signalRAM

0

analogue (0) 2 - 10 V(0)2 – 10 VRAM
1Modbus via Register 0(0)2 – 10 VRAM
2Modbus via Register 0Register 10RAM
3analogue (0) 2 - 10 VRegister 10RAM

 Detailed information on register 568 (Modbus communication parameters)

Register valueDisplay setting valueBaud rateParityStop bits

0

11200None2
121200straight1
231200odd1
342400None2
452400straight1
562400odd1
674800None2
784800straight1
894800odd1
9109600None2
10119600straight1
11129600odd1
121319200None2
131419200straight1
141519200odd1

15 **

16

38400

None

2

161738400straight1
171838400odd1
18191200None1
19202400None1
20214800None1
21229600None1
222319200None1
232438400None1
242576800None1
2526115200None1
262776800None2
272876800straight1
282976800odd1
2930115200None2
3031115200straight1
3132115200odd1

** Factory setting: Modbus communication parameters

 
Commissioning

After installation, wiring and connection of the supply voltage


  • When using the Modbus interface: Set Modbus communication parameters via the integrated menu, then the air terminal unit is ready for operation
  • Setpoint value default setting via Modbus register
  • When using the analogue interface: air terminal unit is immediately ready for use
  • Remove terminal cover of the control component only for wirin

Observe volume flow control ranges


  • TVE: 4 - 100 % of qvnom
  • TVE-Q: 10 - 100 % of qvnom
  • In particular, do not fall below the values for the minimum volume flow of the control unit

Range of display functions


Display functions


  • Actual volume flow rate (unit optionally m³/h, l/s, cfm)
  • 3-character display with positional notation
  • Status and error display for various operating states, including display of activated override control and diagnosis function


Parameter setting


  • Adjustment option for the unit of the volume flow rate display m³/h, l/s, cfm
  • Adjustment option for the operating range qvmin, qvmax
  • Selection of interface configuration Modbus or analogue including signal voltage range 0 - 10 V or 2 - 10 V DC
  • Setting option for Modbus communication settings (address, baud rate, stop bits, parity)


Diagnosis functions


  • Activation of a test run
  • Activation of override controls Open, Closed, qvmin, qvmax, motor stop (observe prioritisation)
  • Display of the voltage value on the analogue input


Use and description of the display


Pressing the LED button (< 3 s) selects the next menu item (1) - (6). The selected menu item can be changed by pressing the LED push button for more than 3 s. Changing is done with the rotary selector switch. Pressing the LED push button again (< 3 s) confirms the selected value. If no entry is made for ≥ 60 s, the system returns to menu item 1.


Table 1: Description of the menu items


① FlowDisplay of actual values or operating states. Setting the volume flow rate unit m³/h, l/s, cfm.
② VminSetting qvmin
③ VmaxSetting qvmax

④ DIAG

Display of control signal and feedback signal alternately in [V],
Activation of override controls for test and diagnostic purposes:
tst = test drive
oP = Flap Open
cL = Flap Closed
Lo = qvmin
Hi = qvmax
St = motor stop
oFF = Priority control off
000 = Display firmware version

⑤ MODE

Selection of the operating mode:
CA0 = Setpoint input and actual value return via analogue interface (0 - 10 V)
CA2 = Setpoint input and actual value return via analogue interface (2 - 10 V)
CB2 = Setpoint input and actual value return via Modbus - optional actual value return via (2 - 10 V)

⑥ COM

Setting the modbus address: 1 - 247

and the baud rate, parity, stop bits: 1 (b1) - 32 (b32)


Description of status LEDs and error messages


LED flashing signalStatusDisplay

no power supply connected

Service tool plugged in.
On-site network connection deactivated.
Forced controls from the service tool have priority

Undervoltage detected.
Supply voltage outside the tolerance range.
Control function not guaranteed

TROX service technicians provide information.
Incomplete parameterisation was detected during power-on/reset *

Drive overload detected (block) *

Synchronisation drive after Power Up *

Test mode enabled *

Overpressure sensor (Overpressure) *

Setpoint or forced control position not yet reached (display changes between e.g. Hi = high and actual value) *

Forced control position reached
(display changes between e.g. Hi = High and actual value) *

Offset: Is signalled as long as the drive does not rotate to readjust the setpoint value *

Notes:

  1. The signal spans 2 seconds. 1 = LED is illuminated, 0 = LED is not illuminated
  2. For service tool plugged in (display: Pc) and undervoltage detected (display: Lou), no special flashing signal appears on the LED button. Instead, one of the operating states marked with an asterisk (*) is displayed.


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