Fuse Replacement; Pom4220 Fuse Replacement - Siemens SIPLUS HCS Series Operating Instructions Manual

Service and maintenance

12.3 Fuse replacement

12.3 Fuse replacement
Safety guidelines
Danger from electrical voltages
May cause death or serious injury
• Before changing a fuse, you must isolate the load circuit from the supply.
• Before working on the heating control system or the connected components, ensure the
NOTICE
Use only the prescribed fuse types (see section Ordering data (Page 258)). If you operate
the device with unapproved fuses, the device could be destroyed.
12.3.1

POM4220 Fuse Replacement

Removing the POM4220
To replace the channel fuses, the Power Output Module (POM) on which the fuse to be
replaced is located must be removed from the rack.
NOTICE
ESD-sensitive components
Before you remove the board, please note the ESD information in Section ESD guidelines
(Page 260).
1. Proceed as described in Section Replacing the POM4220 (Page 198).
2. Place the board on an ESD-compatible surface
188
WARNING
system is disconnected.
SIPLUS HCS4200 PROFINET/PROFIBUS DP
Operating Instructions, 07/2019, A5E35066204A/006