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Installation and operating instructions Wilo-Control SC-Booster (SC, SC-FC, SCe) 45
Fault-actuated switchover of multi-pump
system
SC switchgear with frequency converter (FC):
If the base-load pump has a fault, it is switched off
and another pump is switched onto the frequency
converter. If the frequency converter has a fault,
the switchgear works like an SC switchgear with-
out frequency converter.
SC switchgear without frequency converter:
If the base-load pump develops a fault, it is
switched off and one of the peak-load pumps is
managed by the control system as a base-load
pump.
SCe switchgear:
If the base-load pump develops a fault, it is
switched off and another pump takes over the
control function.
A fault on a peak-load pump always leads to it
being deactivated, and activation of another
peak-load pump (possible also the standby
pump).
6.2.2 Motor protection
Overtemperature protection
Motors with WSK (thermal winding contact) signal
a winding overtemperature to the switchgear by
opening a bimetal strip contact. The WSK is con-
nected according to the wiring diagram.
Faults on motors that are equipped with a tem-
perature-dependent resistor (PTC) for overtem-
perature protection can be registered using
optional evaluation relays.
Excess-current protection
Direct-starting motors are protected by motor
protection switches with thermal and electro-
magnetic trip triggers. The trigger current must
set directly on the motor protection switch.
Motors with Y-∆ starting are protected by thermal
overload relays. These are installed directly on the
motor contactors. The trigger current must be set
and is 0.58 * I
nom
with the Y-∆ starting used.
All motor protection devices protect the motor
during operation with the frequency converter or
in mains operation. Pump faults which reach the
switchgear result in deactivation of the corre-
sponding pump and activation of the SSM. When
the cause of the fault has been rectified, it is nec-
essary to acknowledge the fault.
The motor protection is also active in manual
mode, and leads to deactivation of the corre-
sponding pump.
In the SCe version, the pump motors protect
themselves by mechanisms integrated in the fre-
quency converters. The error messages from the
frequency converters are handled in the switch-
gear as described above.
6.2.3 Operation of the switchgear
Operating elements
• Main switch on/off (lockable in “Off” position)
•The LCD shows the operating statuses of the
pumps, the controller and the frequency con-
verter. The menu selection and parameter input
are performed using the operating knob. Turn the
knob to change values or to scroll through a menu
level; press it in order to select and confirm:
Information appears on the display as shown in
the sample illustration below:
Fig. 5: Display structure
Item Description
1 Menu number
2
Value display
3 Units display
4
Standard symbols
5
Graphic symbols
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