16
Installation
Fig. 7:
Connection example for a three-phase AC motor with PTC resistor tripping device
With motor protection switch
Suitable are protection switches with slow triggering characteristics. The drive motor can
have a power consumption that is higher than the rated current I
N
. According to DIN EN
60034-1 it is permissible to exceed the rated current I
N
1.5 times for a period of 2 min-
utes. The setting must permit the overload ability of the motor and can be found in the
following table.
BA 251
BA 501
Frequency converter (valid for three phase motors)
Operation of rotary vane pumps with variable rotation speeds is possible in the mains fre-
quency range between 35 and 60 Hz. The start-up can use a ramp (run-up time: max.
30 s); the shutdown can occur directly.
Electrical connection
with cooling water
pressure monitor
Prepare the circuitry of the motor with cooling water pressure monitor 3 according to the
circuit diagram. A combination with a PTC resistor temperature sensor (3TF) is also pos-
sible.
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)
Voltage [V]
Frequency
[Hz]
Motor rating [kW]
I
N
[A]
I
max
[A]
230
50
11
34.3
322
400
50
11
19.8
186
265
60
13
34.5
331
460
60
13
19.9
191
Voltage [V]
Frequency
[Hz]
Motor rating [kW]
I
N
[A]
I
max
[A]
400
50
15
27.5
261
690
50
15
15.9
151
460
60
18
28.1
267
