Separately Driven Fan; Temperature Monitoring - KEB Dynamic Line I Betriebsanleitung

2.6.5

Separately driven fan

The motors SM.51 are forced-air-cooled by an axial fan with a single-phase split motor. The connection data are
given on the motor name plate. The necessary terminal plug is included in the delivery of the motor.
Motor type
CxSM.51
DxSM.51
ExSM.51
Check external
2.6.6

Temperature monitoring

PTC thermistors are installed as standard in the NDE winding head to protect the motors against thermal overload
when the temperature change is slow (temperature change in minutes or hours).
max. 30 V DC
Due to the non-ideal thermal coupling, the temperature sensor follows rapid winding temperature changes only
with delay, thus being unable to protect the winding if the thermal overload of the motor is transient and high.
Therefore, additional protection is required (e.g. monitoring I
motor from fast-rising thermal overload.
Attention
Rated voltage
230 V (+10 % / -10 %) 50/60 Hz
230 V (+ 10 % / -10 %) 50/60 Hz
3 x 400 V (+10 % / -10 %) 50/60 Hz
If the motor has an external fan it must be connected proper and the direction of
rotation is to be checked (arrow-direction of rotation to fan housing). The fan wheel
fan
may not be obstructed in its motion by exterior objects. The exhaust air of neigh-
bouring units may not be sucked in again directly.
The maximum operating voltage of the PTC thermistors must not exceed 30
V DC.
The evaluation of the temperature sensor belongs to the monitoring of the motor
winding. The temperature sensor follows fast temperature changes only with delay.
overload Especially the windings of small motors (AxSM.50 and BxSM.50) are very sensi-
tive to overload.
Product Description
Rated current
0.12 A
0.30 A
0.15 A
x t by the inverter electronic system) to protect the
2
Degree of protection
IP 54
IP 54
IP 44
GB - 13