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CONTROL UNIT ERROR and FAULT CONDITIONS .
• PLC operation - Normally, POW (red) indicator is lit while RUN (green) indicator is
blinking fast. (Note that PLC operation indicators is located on the PLC front panel.)
• MOTOR FAULT. (FAULT indicator lit constantly.) Motor fault caused by it's overload
protection, will cause immediate motor stop, at any location , while FAULT indicator
lit constantly. (PLC inputs indicators – No. X0 lit in case of motor over load
malfunction.) In this case :
a) Reset the overload OL1 by turning the knob left to O position (Release) then back to
| position (Up).
b) Reset the control unit by pressing the FAULT sw.
• DP FLUSH FAULT. (FAULT indicator lit.)
A high differential pressure also can be seen on PLC - DP inlet No. X3 that lit).
In this case, pressing FAULT sw. will reset the system and resume operation.
Note that since a DP still exist the flushing mechanism will execute another REGULAR
FLUSH followed by EMERGENCY FLUSH scans. If a second attempt to remove the DP
signal is failed then manual screen cleaning is required.
• MOTOR limit switches error.
The flushing cycles (scans) executed by the motor movement IN and OUT limit area
bordered with two limit switches. Malfunction in one or both can cause damage to
the filter mechanism.
To avoid this situation the flush mechanism measure the elapsed time required to
scan from LSI to LSO and vice versa.
If a signal from LSI or LSO (Due to malfunction/bad connection) is not registered after
the last measured time , FAULT indicator will blinks , indicating that one or both limit
switches malfunctioned.
In case of LSI /LSO malfunction FAULT indicator will blink.
Note that the control unit will continue to activate the flushing mechanism with last
time / location registered by LSI or LSO.
In this case check and readjust the limit switches as described on chapter E paragraph
2 and 3.
SV3 OPERATION
SV3 serve two purposes according to preset configuration.
• By setting SV3 as a FAULT valve , SV3 will be activates on FAULT State.
In this case it can be used to open a bypass valve.
• By setting SV3 as a FLUSH valve , SV3 will be activates and after preset PRE-FLUSH
time the flush cycle will start.
In this case it can be used to control a down stream valve which enables more
dirt collector sucking ability therefore less time/scans required for successful
flushing.
To configure this option refer to screen no. 1.2.0
40
(factory set on FAULT configuration.)
AF900
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