Wilo TOP-Z - 7.2.1 Motor protection

English
34 WILO SE 11/2023
• Commission pumps only if they are fitted with the correct modular cover. Check
that the cover gasket is correctly seated.
• Earth the pump/installation as per regulations.
7.2.1 Motor protection
DANGER! Risk of fatal injury!
Improper electrical connections can lead to fatal electric shock.
If the mains and thermal winding contact (WSK) line are fed in a 5-wire cable,
the thermal winding contact line is not allowed to be monitored with an
extra-low voltage.
CAUTION! Risk of material damage!
If the thermal winding contact (WSK, terminal 10 and 15) of the pump is not
connected to the motor protection, the motor might be damaged by thermal
overload!
• The setting of any thermal tripping fitted must correspond to the maximum
current (see rating plate) of the speed stage at which the pump is being
operated.
Pump with terminal
box type
Tripping SSM
(collect
ive
fault
signal)
Fault acknowledgement
1~ 230 V
1/2
(P
1
max ≤ 205 W)
Internal interruption of
motor voltage
-
Automatically, after the motor
has cooled down
3/4
(295 W ≤ P
1
max
≤ 345 W)
WSK and external trip-
ping unit (SK602(N)/
SK622(N) or other
switchgear/control
device)
-
After the motor on the SK602/
SK622 has cooled down: manually
on the tripping unit
on the SK602N/SK622N:
automatically
5
(295 W ≤ P
1
max
≤ 345 W)
WSK and external trip-
ping unit (SK602(N)/
SK622(N) or other
switchgear/control
device)
- After the motor on the SK602/
SK622 has cooled down: manually
on the tripping unit
on the SK602N/SK622N:
automatically
3~ 400 V 6
(P
1
max ≤ 215 W)
Internal interruption of
a motor phase
- • Switch off mains voltage
• Allow motor to cool down
• Switch on mains voltage
7
(305 W ≤ P
1
max
≤ 1445 W)
WSK and external trip-
ping unit (SK602(N)/
SK622(N) or other
switchgear/control
device)
- After the motor on the SK602/
SK622 has cooled down: manually
on the tripping unit
on the SK602N/SK622N:
automatically