Installation
13
With PTC temperature sensors (3PTC)
Pump motors equipped with PTC temperature sensors (3PTC) in the stator windings can
be connected to a PTC resistor tripping device for protection against overload. Other ap-
proved motor temperature monitoring can be used also by the operator.
Tripping devices store the shutdown event and need to be manually switched back on
again via the integrated RESET button or via the external RESET S3. Mains-ON is de-
tected as an automatic RESET.
Set up the connections so that the directional rotation indicated on the pump is main-
tained, regardless of the representations in the current flow diagram.
Fig. 7:
Connection example for a three-phase AC motor with PTC resistor tripping device
U
S
Control
voltage
S
1
OFF
button
S
2
ON
button
S
3
RESET button, external
K1
Contactor
F1 ... F4 Fuses
T1... T3 PTC resistor sensor
H1
Tripping indicator
M
Motor, 3-phase
1)
Only for devices with two
relay outputs
2)
Only for MSR type
3)
Only for order no.:
P 4768 051 FQ
N
L1
M
3
L2
L3
F1 - F3
K1
10
11
AC 220 ... 240 V
Us
F4
U
V W
S1
S2
k1
K1
H1
S3
2)
A1
A2
T1
T2
Y2
Y1
24
21
22
14
12
11
2)
2)
1)
1)
1)
T1...T3
3)
NOTICE
Do not start with star/delta connection.
Always start motor directly.
