SEW-Eurodrive DRE 315, Руководство по эксплуатации

Страница: 22 / 52

22
Operating Instructions – Explosion-Proof AC Motors – DRS/DRE/DRP 315
5
Motors in category 3GD
Electrical Installation
5.6.6 Protection exclusively with motor protection switch
Note the following when installing the motor protection switch to EN 60947:
• The motor protection switch must trip immediately in the event of a phase failure.
• The motor protection switch must be set to the rated motor current indicated on the
nameplate.
5.6.7 Protection exclusively with PTC thermistor (TF)
The positive coefficient thermistor must be evaluated using a suitable device. Observe
the applicable installation regulations.
5.6.8 Protection with motor protection switch and additional PTC thermistor
The conditions stated for exclusive protection with motor protection switches also apply
here. Protection with positive temperature coefficient thermistors (TF) only represents a
supplementary protection measure which is irrelevant to certification for potentially ex-
plosive conditions.
NOTE ON EXPLOSION PROTECTION
Proof of the efficacy of the installed protective equipment is required prior to startup.