Normal operation
Measure the normal operating temperature T
operation
at the installation site in °C. Set the values
for shutdown and warning according to the operating temperature T
operation
.
Table 7-4 Set values for monitoring the winding temperatures in normal operation
Set value Insulation class 155(F)
Warning T
op
+ 10 K ≤ 145 °C
Shutdown T
op
+ 15 K ≤ 155 °C
7.5 Commissioning an external fan
An external fan is suitable for use only in unidirectional operation; refer to the specification of
the direction of rotation on the fan cowl or on the fan unit. The external fan ensures that the
machine is cooled irrespective of the machine speed or direction of rotation.
If the cooling air is in open circulation, it must have only weak, chemically abrasive properties
and only a low dust content.
Checks before the first test run
Before the first test run, carry out the following checks:
● The external fan is correctly fitted and aligned.
● The rotor runs freely.
● All of the retaining elements and electrical connections are securely tightened.
● The grounding and equipotential bonding connections to the mains have been correctly
made.
● The air flow is not impeded or shut off by flaps, covers or similar.
● All protection measures have been taken to prevent accidental contact with moving or live
parts.
Performing the test run
1. Switch the external fan motor on and off briefly.
2. Compare the the direction of rotation of the external fan with the arrow indicating the
direction of rotation. If the direction of rotation and the arrow do not match, then switch two
of the three phases of the external fan motor.
Commissioning
7.5 Commissioning an external fan
1MB5 SH 400/450
Operating Instructions, 05/2019, A5E45959221A 93
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