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Table 4- 2
4.7
Thermal protection
The machine is optionally equipped with PTC thermistors, Pt100, Pt1000 or bimetallic
sensors. Thermal machine protection by directly monitoring the winding temperature is
permissible if this is certified and test data specified on the rating plate. PTC thermistors for
direct temperature monitoring (sole protection) ensure explosion protection in conjunction
with function tested tripping devices in accordance with local regulations.
● Direct temperature monitoring for line (DOL) operation: You can operate the machine
without a circuit breaker. Evaluate the temperature sensors.
● Direct temperature monitoring for inverter operation: Evaluate the temperature sensors.
● If you have to perform a continuity test of the temperature sensors, do not apply a voltage
>2.5 V. If no test data is specified on the rating plate, this means that the winding
protection is only intended as an additional protection.
● For pole-changing machines, use a direct temperature monitoring sensor as stated on the
rating plate, e.g. PTC thermistor, for each speed level in addition to the separate,
mutually interlocked machine protection relays.
4.8
Interlock circuit for anti-condensation heating
If the anti-condensation heating is operated while the machine is running, this can increase
the temperatures inside the machine.
● Install an interlock circuit that switches off the anti-condensation heating once the main
machine is switched on.
● Only switch on the anti-condensation heating after the machine has been switched off.
See also
Switching on with the anti-condensation heating active (Page 98)
1MB155 / 1MB555
Operating Instructions, 03/2018, A5E41926185A
Minimum dimension "X" for the distance between adjacent modules and the air intake of
the machine
Frame size
63 ... 71
80 ... 100
112
132
160
180 ... 200
225 ... 250
280 ... 315
355
Preparations for use
4.7 Thermal protection
X
mm
15
20
25
30
40
90
100
110
140
41
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