Screws With Precote Coating; External Fan Cowl - Siemens SIMOTICS 1PQ8 Operating Instructions Manual
Low-voltage motor
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Maintenance
9.2 Corrective Maintenance
Incorrectly repairing the anti-condensation heating
If the anti-condensation heating is not correctly repaired, e.g. if unauthorized or untested
spare parts are used, this can result in explosions during operation in a potentially explosive
atmosphere. This can result in death, serious injury or material damage.
● Only appropriately trained specialists in the Service Center (Page 155) are authorized to
● Only use authorized and tested spare parts.
9.2.3
Screws with preCOTE coating
The motor can partly be fitted with screws with preCOTE coating. To ensure screw locking,
use new screws with preCOTE coating during assembly/repair. As an alternative, use normal
screws with a threadlocker such as Loctite.
9.2.4
External fan cowl
The external fan is installed in the external fan cowl. To remove or replace it, the external fan
cowl must be disassembled.
Disassembly
Rotating or live parts
Live electrical parts at the external fan motor are dangerous. Contact with them can cause
death, serious injury or material damage.
1. Before you start working on the fan, disconnect the fan motor from the supply system.
2. Make sure that the device cannot be switched back on.
3. Wait until the external fan has reached a standstill before you start work.
1. Secure the external fan cowl against falling before you start working.
2. If a speed sensor is installed, it is located inside the external fan cowl. Separate the brought-
3. Loosen the fixing screws that secure the external fan cowl on the enclosure.
4. Observe existing retaining components and retain them for the reassembly.
124
WARNING
repair anti-condensation heating systems. The anti-condensation heating must then be
subject to a routine test, which requires extensive specialist knowledge.
WARNING
out cables of the speed sensor before removing the external fan cowl in the corresponding
terminal box.
SIMOTICS TN Series N-compact 1PQ8
Operating Instructions 11/2018
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