Wilo Padus UNI - Page 16

en Installation and electrical connection
16 WILO SE 2019-02
ƒ Check the insulation resistance of the motor winding.
ƒ Test the resistor of the temperature sensor.
If the measured values differ from the specifications, moisture
may have penetrated into the motor or the power supply cable or
the monitoring device is defective. Contact customer service in
the event of a fault.
6.5.2.1 Checking the insulation resistance of the motor wind-
ing
Use an insulation tester to measure the insulation resistance
(measuring voltage=1000V). Observe the following values:
ƒ At the time of initial commissioning: Insulation resistance may
not be less than 20MΩ.
ƒ For further measurements: Value must be greater than 2MΩ.
NOTICE!For motors with an integrated capacitor, short-circuit
the windings prior to checking!
6.5.2.2 Test the resistor of the temperature sensor
Measure the resistor of the temperature sensors with an ohm-
meter. The bimetallic strips must have a measured value of
0Ohm (passage).
6.5.3 Connection of the single-phase current motor
U1/Z1
bn
U2
bu
C
r
M 1~
gn-ye
LNPE
Fig.5: Connection diagram single-phase current motor
Wire colour Terminal
Brown (bn) L
Blue (bu) N
Green/yellow (gn-ye) Earth
The single-phase current version is equipped with a shockproof
plug. The connection to the mains is established by inserting the
plug into a socket. The plug is not overflow-proof. Install the
socket so that it is overflow-proof! Observe the information on
the protection class (IP) of the plug.
DANGER!If the pump is connected directly to the switchgear,
dismantle the plug and arrange for the electrical connection to
be carried out by a qualified electrician!
6.5.4 Three-phase current motor connection
W
5 1 2
V
4
U
3
M 3~
gn-ye
L3L2 2120L1PE
250 V (AC); 2,5 A; cos φ = 1
Fig.6: Connection diagram three-phase current motor
Wire number Designation Terminal
1 20 WSK
2 21 WSK
3 U L1
4 V L2
5 W L3
Green/yellow (gn-ye) Earth PE
For three-phase current motors, a clockwise rotating field must
be available. The three-phase current version is equipped with a
CEE plug or with a bare cable end:
ƒ If a CEE plug is supplied, connection to the mains is estab-
lished by inserting the plug into a socket. The plug is not
overflow-proof. Install the socket so that it is overflow-
proof! Observe the information on the protection class (IP) of
the plug.
ƒ If there is a bare cable-end, the pump must be connected dir-
ectly to the switchgear. DANGER!If the pump is connected
directly to the switchgear, arrange for the electrical con-
nection to be carried out by a qualified electrician!
6.5.5 Monitoring device connection
All monitoring device must be connected!
6.5.5.1 Monitoring of motor winding
Single-phase current motor
Thermal motor monitoring is self-switching for single-phase cur-
rent motors. The monitoring function is always active and does
not need to be connected separately.
Three-phase current motor with bimetallic strip
Bimetallic strips are directly connected to the switchgear or via an
evaluation relay.
Connection values: max. 250V(AC), 2.5A, cos φ=1
When the threshold is reached, deactivation must take place.