11
Installation
Three phase motor
Inspection of the direction of rotation
With pumps with three-phase motors is it necessary to check the direction of rota-
tion!
Î
Remove the locking cap from the exhaust flange (if existing).
Î
Switch the pump on briefly (from 2 to 3 sec.).
– The motor and motor fan must turn in a clockwise direction (see the arrow on
the support stand).
Î
If the direction of rotation is incorrect: Swap two phase contacts at the connec-
ting cable.
Î
Fill up the operating fluid.
Motor protection
Pump motors equipped with PTC temperature sensors (3PTC) in the stator wind-
ings can be connected to a PTC resistor tripping device for protection against over-
load.
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 detected as an automatic RESET. Other approved motor temperature monitoring
can be used also by the operator.
Î
Set up the connections so that the directional rotation indicated on the pump is
maintained, regardless of the representations in the current flow diagram.
Fig. 6: Connection example for a three-phase AC motor with PTC resistor tripping de-
vice
NOTE
The transmission power of the pump’s magnetic coupling is so great that there
is no overload protection for the motor.
CAUTION
Operating fluids may leak out!
If the direction of rotation is incorrect, there is a danger that operating fluids may leak
at the vacuum flange.
Î
Always check the direction of rotation before filling in operating fluid.
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)
