Compressor Start And Stop Commands; Figure C-3. Setting Microvission In Remote Mode - Emerson Vilter MicroVission Operation And Service Manual
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- Retrofit manual (20 pages) ,
- Operation and service manual (262 pages)
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Appendix C • Remote Control and Monitoring
•
3 = Ethernet (Modbus TCP or Ethernet IP
communications.)
Typically, the following registers are setup (written to)
before a "Start" command is issued to the compressor.
Modbus Register 40172 - Remote Control Select
•
0 = Auto Control. This selection defines that the
MicroVission will control compressor capacity from
its internal Control Setpoints.
•
1 = Pulse Load / Unload. This selection defines that
the MicroVission will control compressor load from
contents of Remote Step Load register 40174 and
Remote Step Unload register 40175.
Modbus Register 40177 - Active Setpoint
This register is used in conjunction with Register 40172
= 0, Auto Control mode.
•
1 = Setpoint #1 Active
•
2 = Setpoint #2 Active (note: you must enable two
setpoints from configuration screen first).
Sometimes compressors are switched from Suction
Pressure control mode to Process Temp control mode or
vice versa. This can be done via communications using
the following register.
MicroVission Controller • Operation and Service Manual • Emerson • 2017VM-16 1.0
Figure C-3. Setting MicroVission in Remote Mode
Modbus Register 40173 - Auto Capacity Control Type
•
0 = Suction Pressure (if enabled from Configuration
screen)
•
1 = Process Temp (if enabled from Configuration
screen)
•
2 = Discharge Pressure (if enabled from Configuration
screen)
Compressor Start and Stop Commands
Modbus Register 40178 – Start Command
•
1 = Start Compressor in Remote Auto Mode
Two (2) minute Remote mode time-out timer
Once the compressor has been started in Remote Auto
Mode using the Start Compressor Command, a 2-minute
timer will start. If no further communication takes place
to the MicroVission within 2 minutes, the MicroVission
will be placed in Local Auto mode, a yellow banner will be
displayed on the MicroVission signifying that a "Remote
Comm Time-out" occurred, and the Event List will get
populated with a time-stamped "Remote Comm Time-
out" event.
Modbus Register 40509 - Stop Command
•
1 = Stop Compressor Command
MicroVission panel will remain in Remote (Idle) mode
after a Stop Compressor command has been issued.
C - 3
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