Operating Instructions – Explosion-Proof AC Motors – DRS/DRE/DRP 315
21
5
Motors in category 3GD
Electrical Installation
5.6
Motors in category 3GD
5.6.1
General information
The explosion-proof/dust explosion-proof SEW-EURODRIVE motors of the DR.315 se-
ries are designed for the following application zones.
5.6.2
Degree of protection IP54
The minimum degree of protection for SEW-EURODRIVE motors in category 3GD is
IP54.
5.6.3
Operation at high ambient temperatures
If the nameplate indicates that motors are allowed to be operated up to an ambient tem-
perature of > 50 °C (standard: 40 °C), then it is essential that the cables and cable
glands used are suited for temperatures
≥
90 °C.
5.6.4
Temperature class/surface temperature
The motors are designed for temperature class T3. The maximum surface temperature
is 120 °C or 140 °C.
5.6.5
Protection against impermissibly high surface temperatures
Explosion-proof motors in category 3GD ensure safe operation under normal operating
conditions. The motor must be switched off securely in the case of overload to avoid the
risk of impermissibly high surface temperatures.
The motor can be protected with a motor protection switch or a positive temperature co-
efficient (PTC) thermistor. Pole-changing motors in category 3GD from SEW-EURO-
DRIVE are equipped with PTC thermistors (TF).
Motor category
Area of application
3GD
Application in zone 2 or 22 and compliance with the design requirements for
equipment group II, category 3GD.
