Siemens SIPLUS HCS Series Operating Instructions Manual page 41

Restriction of the switching power when operating without soft start and phase angle control
Due to the different physical properties of radiation sources, this may result in restrictions of
the permissible switching power depending on the type of radiation source.
Short-wave halogen or infrared emitters ("flash heating elements") have a high starting
current due to their relatively low cold resistance. The starting current can be several times
the rated current, especially during the first half waves.
Overloading of the internal fuses of the POM can occur depending on the number of
switching operations as well as the duration of switching operations and pause times.
NOTICE
Restriction of the switching power
When using flash radiators with the following outputs, switching operations can result in
extremely high currents which trigger the channel fuses:
• Over 750 W at 230 V AC with POM4220 Lowend
• Over 1600 W at 230 V AC with POM4220 Midrange phase angle control and
• Over 2700 W at 230 V AC or 4800 W at 400 V with POM4220 Highend
• Over 4000 W at 400 V AC with POM4320
The power limit for each POM is set by the technical parameter "Current carrying capacity
per output, max. for heating elements with high inrush current" (see Technical
specifications (Page 205)) for each POM.
Therefore, we recommend you to have Siemens AG measure radiation sources with a high
inrush current
Derating of fuses
Note that fuses are subject to derating at high ambient temperatures, i.e. the rated current
for a fuse is reduced.
SIPLUS HCS4200 PROFINET/PROFIBUS DP
Operating Instructions, 07/2019, A5E35066204A/006
POM4220 Flexible
Application planning
4.4 Installation location
39