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. 11:
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
► For motors equipped with PTC in the stator winding, connect a thermistor tripping unit as protec-
tion against overload.
► Observe the supplied operating instructions for the motor with regard to the construction guide-
lines.
► 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.
5.5.5 Checking the direction of rotation
Operating fluid leaks out
The direction of rotation must be checked on vacuum pumps with three phase motors. If
the direction of rotation for the vacuum pump is incorrect, there is a risk of operating fluid
escaping at the vacuum flange.
● Check the direction of rotation before refilling operating fluid.
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.
5.6 Filling the operating fluid
The operating fluid type intended for the vacuum pump and the respective filling quantity are indicated
on the rating plate. Only the operating fluid used during initial installation is permissible.
Installation
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