User Manual

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Siemens Universal controllers RMU710B, RMU720B, RMU730B CE1P3150en
Building Technologies Refrigeration demand 03.10.2011
26.6 Display values
Heat and refrigeration demand are visible on the password level under:
Main menu > Aggregates > Heat and refrig demand >
Operating line Range Comments
Refrig demand air handling 0...100% From RMU(A,U), RMS
Refrig demand air retreatment 0...100% From RXB
Refrig demand cooling surface 0...100% From RXB
Refrigeration demand -50…250°C From RMU (C)
Refrigeration demand relay On, Off Output Q
Refrig demand modulating 0…100% Output (Y)
The following are visible at the service level:
Main menu > Aggregates > Heat and refrig demand >
Operating line Range Comments
Refrigeration demand relay On, Off Output Q
Refrig demand modulating 0…100% Output (Y)
26.7 Function check / wiring test
During the output wiring test, refrigeration demand can be switched directly.
Main menu > Commissioning > Wiring test > Outputs >
Operating line Comments
Refrigeration demand relay ---, 0...100% (relay switches >= 1%)
Refrig demand modulating ---, 0...100%
26.8 Troubleshooting
The temperature sensor is monitored as follows:
When exiting the "Commissioning" menu, a check is made to see if the sensor is
connected. If no sensor is connected, there is no supervision.
If the sensor is connected but is missing later, a fault message appears (see
section 8.2 "Analog inputs"). The sensor fault is interpreted as "No refrigeration
available".
No. T
ext Effect
3202 No refrigeration available Non-urgent message; must not be
acknowledged or *
Urgent message, with plant stop; must
be acknowledged and reset
101… [N.X1] sensor error Non-urgent message; must not be
acknowledged
* The effect depends on the setting "Impact of fault" (section 26.3)
Digit
al signals cannot be monitored.
Purpose
Setting values
Fault status messages
Note