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7 Operation
NOTE
Error values I18 and I19 serve as information; error values I10, E11 and I14 are
warnings. The pump set does not stop in this case. The error value is displayed until
the corresponding error has been resolved. Error value E05 reduces the speed until
no overload is detected any more.
Examples of Modbus communication
1.
Monitoring the speed:
To be able to read the current speed of the pump set, the following request has
to be sent by the Modbus master: Modbus Request 11 03 07 D8 00 01 07 D5
2.
Setpoint input:
The setpoint can be set to any value from 0 - 9999 (equalling 0 - 100 % of the
setpoint).
Example: Write setpoint 50 %
Modbus Request 11 10 08 35 00 01 02 13 88 EA A3
3.
Input control mode:
The operating mode of the pump can also be changed via Modbus (see table).
Example: Write control mode Open-loop Control
Modbus Request 11 10 08 34 00 01 02 00 10 E7 E8
Control options of pump sets and priorities
The pump set can be controlled via the control element, Modbus or the analog input.
The control options available are indicated in the table.
The pump set will start up when no alarm is active, the RUN contact is bridged, and
the pump set is connected to 230 V. If the external analog 0 - 10 V signal is active, the
setpoint of the analog input will be valid; all other setpoint inputs will be ignored. If
the external analog 0 - 10 V signal is disabled, the last valid setpoint is valid,
regardless of whether the input is made via the control element or Modbus. The
operating mode can be changed at any time via Modbus or the control element;
both are of the same priority.
Table 31: Symbols key
Symbol
✘
-
Table 32: Setting options for the pump sets
Setting option
Operating mode
0 - 10 V
Modbus
Control element
If the Modbus function and the DUAL (dual-pump operation) functions are both
active, either one or both of the pump sets can be connected to Modbus. Changes of
global input for the duty pump set will also be transmitted to the stand-by pump set
via the terminal pair DUAL. In Dual-pump Operation operating mode the following
priorities apply to the setpoint input:
Table 33: Priority list
Priority
Setpoint input
1
0 - 10 V of master pump
2
0 - 10 V of slave pump
3
The last valid value input via Modbus or control element of the master
pump or slave pump
The digital input (RUN terminal) is factory-set to start up and stop the pump set.
If the digital input is configured for a different function, the pump set can no longer
be stopped via the digital input.
CalioTherm Pro
Description
Setting possible
Setting not possible
Setpoint
-
✘
✘
✘
✘
✘
Start/stop
✘
✘
-
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