Monitoring Power Channels - Siemens SIPLUS HCS Operating Instructions Manual

Functions
9.6 Monitoring functions
9.6.6

Monitoring power channels

Power output diagnostics
The power output module (POM) has a diagnostics function to detect errors in the power
outputs. In every half-wave, the status of the power output is requested and checked at a
fixed point in time.
The following faults are detected:
Fault
Heating element / emitter cable
defective
Triac breakdown
Incoming fuse has tripped
Outgoing fuse ruptured or triac
has high resistance
Note
The "triac breakdown" fault is always indicated (provided the mains voltage is connected),
regardless of heating status; all other faults are only indicated when heating is enabled
(heating is "ON").
For more information about the structure and output of diagnostic alarms, see Section
Transfer of diagnostic alarms to the controller (Page 94).
You will find information about the causes of faults and possible rectification measures in
Section Auto-Hotspot.
Suppression of channel errors
Errors are reported for all power outputs/channels as standard. The user can, however,
define a list of channels for which errors should not be reported. This is appropriate when
some channels are not wired up in the plant.
80
Description / Special characteristics
-
"Breakdown" means the triac is defective and conducts continu-
ously even without being activated.
This fault can only be detected if the power output is switched off.
For a 100 % setpoint, the fault can be neither detected nor indi-
cated.
-
This fault can only be detected if the power output is switched on.
For a 0 % setpoint, the fault is not detected and also cannot be
indicated.
Operating Instructions, 11/2015, A5E35452705A/002
SIPLUS HCS4300