Installation and operating instructions Wilo-Control MS-L 1x4kW
37
TROUBLESHOOTING AND POSSIBLE SOLUTIONS English
Maintenance or repair work and/or con-
structional changes that are not listed in this
operating and maintenance manual may only be
carried out by the manufacturer or by author-
ised service centres.
9.1. Maintenance intervals
To ensure reliable operation, various maintenance
tasks must be carried out regularly.
NOTE
When used in sewage lifting units inside build-
ings or on land plots, the maintenance intervals
and work shown in DIN EN 12056‐4 must be
adhered to.
Before initial commissioning or after a longer
period of storage:
• Clean the switchgear
Yearly
• Visual inspection of individual components
9.2. Maintenance work
Prior to maintenance work, the switchgear must
be switched off as described under "Temporary
shutdown". Maintenance work may only be car
-
ried out by qualified persons.
9.2.1. Clean the switchgear
Use a damp cotton cloth to clean the switchgear.
Do not use any aggressive or scouring cleaners
or fluids!
9.2.2. Visual inspection of individual components
Have the individual components checked for wear
by a qualified electrician or Wilo Customer Service
(e.g. melting of protective contacts, deformation
of plastic parts).
If severe wear is identified, have the affected
components replaced by a specialist electrician or
Wilo Customer Service.
9.3. Repair work
Prior to repair work, the switchgear must be
switched off as described under "Final shutdown"
and all power supply cables dismantled. Repair
work must be carried out by an authorised service
centre or Wilo Customer Service.
10. Troubleshooting and possible solutions
DANGER due to electrical voltage!
Improper procedures during electrical work
may result in fatal injuries caused by electrical
voltage! Such work may only be carried out by
a qualified electrician.
Potential faults are indicated visually and audibly.
According to the fault shown, the connected
pump or signal transmitter must be checked for
correct operation and replaced if necessary.
Only perform this work if suitably qualified
personnel are available. Electrical work must be
carried out by qualified electricians for instance.
We recommend always having this work carried
out by Wilo Customer Service.
Unsanctioned modifications to the switchgear are
made at the operator's own risk and release the
manufacturer from any warranty obligations.
10.1. Acknowledging faults
After a fault occurs, a visual and audible warning is
output.
By briefly pressing the Buzzer OFF/reset button,
the audible alarm is deactivated and collective fault
signal relay (SSM) acknowledged.
When held down for longer (min. 1 sec), the fault is
acknowledged and the control is reenabled.
A fault can only acknowledged once it has been
eliminated!
10.2. Fault signals
LED lights up red
Cause:
permitted rated current has been exceeded,
excess current release has been initiated
Solution:
Checking the pump and the DIP switch
setting
LED flashes red
Cause:
Rated current below 300 mA during opera
-
tion or phase L2 missing
Solution:
Check mains connection of switchgear
and pump connection
LED lights up red
Cause:
Winding temperature monitoring has been
triggered
Solution:
Check pump and wiring (converter bridge
may be missing); check pump operating conditions
LED lights up red
Cause:
High-water alarm has been triggered.
Solution:
Check pump/unit operating conditions
and level settings
All LEDs light up simultaneously for 2 sec.
Cause:
Button lock active
Solution:
Deactivate the button lock by simulta-
neously pressing down the Manual Mode, Stop and
Automatic Mode buttons (for approx. 1 s).
All LEDs light up from right to left.
Cause:
Incorrect phase sequence in mains connec-
tion
Solution:
Swap over 2 phases in the switchgear's
mains connection
10.3. Fault memory
The switchgear has a fault memory. The last fault
is stored retentively in the fault memory.
Opening the fault memory
By pressing down the Stop and Automatic Mode
buttons simultaneously, the last fault is indicated
by the corresponding LED.
