Commissioning
7.3 Insulation test
SIPLUS HCS4200 PROFINET/PROFIBUS DP
102
Operating Instructions, 07/2019, A5E35066204A/006
7.3
Insulation test
POM4220
Due to the protective impedances and filter capacitors installed in the device, you must
remove the following connectors from the Power Output Module (POM) before performing an
insulation test on the equipment:
●
Plug connectors for the line supply X2
●
Plug connectors for the heating elements X1, X3
Due to the protective impedances, the following protective conductor current flows under
normal operating conditions:
Voltage
Protective conductor current
Note
POM4220 Lowend
POM4220 Midrange
phase angle control
POM4220 Flexible
POM4220 Highend
The specified protective
conductor current refers to
the output channels of one
phase of a POM.
230 V / 50 Hz
<1.9 mA
<12.8 mA
277 V / 50 Hz
<2.3 mA
<15.4 mA
POM4320
Because of the protective impedances in the device, the isolation resistance of a device of
each phase to ground with an open load is around 124 k
Ω
and around 70 k
Ω
with connected
heating loads. These values must be taken into account for an isolation test.
With multiple devices in a circuit, you have to factor in the parallel connection of the
impedances. You may need to remove the device from the circuit prior to the isolation test.
Due to the protective impedances, the following protective conductor current flows under
normal operating conditions:
Voltage
Protective conductor current
400 V / 50 Hz
<1.1 mA
480 V / 60 Hz
<1.4 mA
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