Procedure
1. Switch on the rotary vane pump briefly (2 to 3 seconds.)
– The motor and motor fan must rotate clockwise (see the arrow on the fan cover).
2. If the direction of rotation is incorrect, exchange the 2 phases on the connection cable.
3. Refill the operating fluid.
5.5.5 Connecting the PTC thermistor tripping unit
Tripping units store the shut-down
Pfeiffer Vacuum recommends connecting motors with PTC in the stator winding to a PTC
resistor tripping device for protection against overload.
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)
Fig. 12:
Connection example with PTC thermistor tripping unit
U
S
Control voltage
T1 – T3
PTC resistor sensor
S
1
OFF button
H1
Tripping indicator
S
2
ON button
M
Motor, 3-phase
S
3
RESET button
1)
For devices with two relay outputs only
K1
Contactor
2)
For MSR type (model) only
F1 – F4 Fuses
3)
Only for order no.: P 4768 052 FQ and P 4768 052 FE
Procedure
► After shut-down, switch the tripping unit back on manually via the installed RESET button or via
the external RESET S3.
– Switching on mains detected as automatic RESET.
5.5.6 Setting the motor protection switch
The magnetic coupling is not intended for use as overload protection
The torque is too great for it to act as overload protection for the motor.
Motor protection switches are current-dependent protective devices for the drive motors. Protection
switches with slow tripping characteristics are suitable. When adjusting the motor protection switch, take
into consideration that certain operating conditions (for example, cold pump start) can cause short-term
increases in power input.
Installation
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