Operating Instructions – Explosion-Proof AC Motors DR63/eDR63, DVE250/280
35
5
Accessory equipment
Electrical Installation
Below figure shows the characteristic curve of the TF with reference to the rated re-
sponse temperature (referred to as T
NF
).
5.15.2 Forced cooling fan /VE
Motors in category II3D and II3GD can be equipped with a forced cooling fan as an op-
tion. For notes on connection and safe operation, refer to the operating instructions of
the VE forced cooling fan.
V forced cooling fans must not be used with explosion-proof EDR.. AC motors.
5.15.3 Anti-condensation heating for motors in category II3D
An anti-condensation heating is required when the explosion-proof motors are operated
at temperatures below -20 °C.
Anti-condensation heating is optional for applications above -20 °C where moisture con-
densation is expected.
When connecting the anti-condensation heating, observe the permitted supply voltage
for the strip heater according to the motor nameplate as well as the wiring diagram of
the motor.
Do not energize the strip heater as long as the motor is switched on.
5470153483
4000
1330
550
250
-20°C
[T]
T
NF
T
NF
- 20 K
T
NF
+ 15 K
T
NF
- 5 K
T
NF
+ 5 K
R [
Ω
]