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Installation and operating instructions Wilo-SC/SCe-HVAC
85
SC switchgear without frequency converter:
• If the direction of rotation of only one pump in mains operation is
wrong, swap over any 2 phases on motors in direct starting (DOL) in
the motor terminal box.
• If the direction of rotation of only one pump in mains operation is
wrong, swap over 4 connections on motors in star-delta starting (SD)
in the motor terminal box: Swap the winding start and winding end of
2 phases (e.g. V1 for V2 and W1 for W2).
SC switchgear with frequency converter (FC):
• Mains operation: see above (SC switchgear without frequency con-
verter)
• Frequency converter operation: set all pumps to the “Off” operating
mode (menu 3.2.1.1, 3.2.2.1, 3.2.3.1 and 3.2.4.1) and then set each
pump individually to “Automatic”. Briefly switch on the individual
pump to check the direction of rotation in frequency converter oper-
ation. If the direction of rotation of all pumps is wrong, swap over any
2 phases on the frequency converter output.
8.3
Adjusting the motor protection
•
Thermal winding contact/PTC:
No setting is required for the excess
temperature protection.
•
Excess current:
see chapter 6.2.3 “Motor protection” on page 55.
8.4
Signal transmitters and optional
modules
Comply with the installation and operating instructions of signal
transmitters and optional additional modules.
9
Maintenance
Have maintenance and repair work carried out by qualified person-
nel only!
DANGER! Risk of fatal injury!
There is a risk of fatal injury from electric shock when working on
electrical equipment.
• The switchgear must be isolated from the voltage and secured to
prevent it from being switched back on before any maintenance or
repair work.
• Any damage to the connection cable should always be rectified by
a qualified electrician only.
• Keep the switch cabinet clean.
• Clean the switch cabinet and fans if they are dirty. Check the filter
mats in the fans, clean them and replace them if they are excessively
dirty.
• If the motor power is 5.5 kW or more, check the contactor contacts for
burn-up as part of the service intervals. If there is severe burn-up,
replace the contactor contacts.
10
Faults, causes and remedies
Have faults remedied by qualified personnel only! Observe the
safety instructions in chapter 2 “Safety” on page 46.
• If the fault cannot be remedied, contact your nearest Wilo cus-
tomer service point or representative.
10.1
Fault display and acknowledgement
If a fault occurs, the red fault signal LED lights up, the collective fault
signal is activated and the fault is displayed on the LCD (fault code
number).
A faulty pump is indicated on the main screen by a flashing status
symbol for the corresponding pump.
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