155
Trouble shooting SCC
Edition 10-2008a
Service 10 (SC Pump)
Level electrode of the steam generator did not recognise a reduction
of the water level during last SC-Automatic
Indication Service 10
Activate function test
Select step 8
SC Pump M4
and touch „Start“ key
Check pump for scale deposits or
other dirt, that blocks the impeller
Clean housing of the pump, desca-
le steam generator
and /or change pump
Short circuit level electrode or
check drain system and quenching
box for dirt,
clean if necessary
Check cable, connector and
pump. Change defective part
Change auxiliary contact or
contactor
Change I/O-pcb
Change fuse
Check cable and pump for short
circuit
YES
YES
YES
NO
NO
NO
YES
NO
Pump active, water is pum-
ped off
230V output at I/O-pcb
X18 1/2 during function test?
Auxiliary contact 13/14 of
contactor K1 ok?
Fuses F6/F6.1
(on I/O pcb) ok?
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