Basic Documentation

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Siemens Universal controllers RMU710B, RMU720B, RMU730B CE1P3150en
Building Technologies Aggregates 03.10.2011
To ensure optimum control of a twin pump, the RMU7..B provides the following
control functions in addition to standard functions:
 Run priority changeover automatic, manual or in the case of pump fault.
 Adjustable changeover period for orderly changeover of pumps.
Run priority changeover can be automatic, manual, or in the case of fault.
Main menu > Commissioning > Settings > .... or
Main menu > Settings > Aggregates > Pump 1...4
Operating line Range Factory setting
Run priority Automatic
Pump A
Pump B
Automatic
If the selection in operating line "Run priority" is "Automatic", the run priority
automatically changes weekly. Changeover always takes place at the time set for
Pump kick (pump kick does not need to be active).
If no changeover by time is desired, the run priority can be assigned to a pump by
selecting the required pump in operating line "Run priority".
The run priority can also be changed over for test purposes. When switching back
the run priority to "Auto", the run priority remains active at the current pump until
the next changeover by time occurs.
If a pump is faulty, the run priority is set to the other pump. After the fault
disappears, the same run priority as prior to the fault is assumed.
For orderly changeover of run priority, a changeover period can be entered.
Main menu > Commissioning > Settings > .... or
Main menu > Settings > Aggregates > Pump 1...4
Operating line Range Factory setting
Changeover period
60...60 s
0 s
 If a negative number is entered, both pumps are switched on for the period of
time set during changeover
 If a positive number is entered, the second pump can switch on only after the
time has expired after the first pump has switched off
The changeover period is also considered for the Pump kick.
If both pumps are faulty at the same time, a fault message is generated and the
pumps shut off.
No. Text Effect
1210 [Pump 1] fault Urgent message; must be acknowledged and
reset
1220 [Pump 2] fault Urgent message; must be acknowledged and
reset
1230 [Pump 3] fault Urgent message; must be acknowledged and
reset
1240 [Pump 4] fault Urgent message; must be acknowledged and
reset
Additional control
functions
Run priority
changeover
Setting value
Automatic changeover
(by time)
Manual changeover
Changeover in case of
fault
Changeover period
Setting values
Note
Behavior in case of fault
Fault status messages