Frequency Monitoring; Temperature Monitoring - Siemens SIPLUS HCS Series Operating Instructions Manual

9.7.5

Frequency monitoring

Frequency monitoring
The frequency of the applied line voltage is automatically detected and monitored. The
frequency value can be read by the user.
Frequency
50 Hz
60 Hz
Frequency fault
If the frequency of both phases lies outside the permissible range for several consecutive
measurements (e.g. due to disturbance over an extended period), a frequency fault will be
reported to the user (see section Diagnostics data (Page 180)).
This is a group error across all possible sources (PM U/I, POMs).
Fault reaction:
The heating is not switched off and the last valid frequency value measured is retained.
Fault reaction POM4220 Highend:
The heating is switched off. When switched off due to a frequency error, no measured values
other than the heat sink temperature are output.
9.7.6

Temperature monitoring

Internal temperature monitoring
A sensor is installed on the heat sink inside the heating control system (POM) to measure
the internal temperature.
An alarm threshold is defined for the internal temperature. The following reactions are
triggered when the threshold is overshot:
● Signal to the higher-level controller.
● The channels are deactivated - regardless of which channel response was configured for
the error (see section Behavior of the power outputs (Page 141)).
Note
If an internal temperature of 0 °C is reported, this indicates that a temperature sensor has
been torn off.
SIPLUS HCS4200 PROFINET/PROFIBUS DP
Operating Instructions, 07/2019, A5E35066204A/006
Permitted range
47 Hz to 55 Hz
55 Hz to 63 Hz
Functions
9.7 Monitoring functions
149