19
W25, E25 Maximum admissible electrode current exceeded
Function:
monitoring of the heating current (Phase L1)
Procedure:
if a overcurrent is detected the main contactor is switched off
immediately, a draining is carried out and the Warning W25 is triggered.
Subsequently, the main contactor is activated again. If overcurrent occurs
again, the process is repeated. After 3 drainings the error E25 is triggered
if the current could not be reduced.
The excess current monitoring serves for the recognition of fast rising over-
currents. The threshold of 135 % refers always to the nominal current of the
steam generator and therefore it does not depend on the steam demand.
The current value is analysed even if the software related RC element is not
yet loaded. Thus it can be ensured that a fast rising current can be switched
off, before the fuse is triggered.
Behaviour on activation:
Warning
Error
Display
W25A(B): Excess Current
E25A(B): Excess Current
LED display:
-
Red lights
Fault-Remote:
-
Error Relay
Error-History:
-
E25A(B)
System:
Unit is draining
Unit blocked
Time delay:
-
3 drainings
(Time see table)
Reset:
automatic reset
Unit Off/On
Cylinder type
Draining time
5xx/8xxx
30 seconds
15xx
40 seconds
23xx
40 seconds
32xx/45xx/65xx
60 seconds
E26 Current without demand
Function:
current monitoring while the contactor is switched off.
Procedure:
if during operation with deactivated main contactor a current
higher than 1.5 % is registered the error E26 is triggered and the unit is
blocked. Error E26 is triggered and the system is blocked too, if during the
calibration of the unit (after switching the unit on) a certain current value is
exceeded.
Behaviour on activation:
No Warning
Error
Display
-
E26A(B): Req. Off Current
LED display:
-
Red
Fault-Remote:
-
Error Relay
Error-History:
-
E26A(B)
System:
-
Unit blocked and cylinder is draining
Time delay:
-
30 seconds
Reset:
-
Unit Off/On
