nord 6051302, Operating And Assembly Instruction Manual

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Table of Contents
B 1091 en-2722 47
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3.4.3 Second temperature sensor 2TF
Category 3D motors (Zone 22, non-conducting dust) can be supplied with a second temperature sensor
(2TF). This option can be used to implement a warning signal (overheating in the winding). It should be
noted that the temperature sensor with the lower trigger temperature should be used for the warning;
the temperature sensor with the higher trigger temperature must be used to evaluate the switch-off
signal.
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3.4.4 Back stop
Motors having the additional labelling RLS (e.g. 80LP/4 3D RLS ) are equipped with a back stop. For
motors with back stop, the direction of rotation is marked by an arrow on the fan cover. The arrow head
points to the drive shaft’s direction of rotation (AS). When connecting the motor and during motor control,
it must be ensured – for example by testing the field of rotation – that the motor can only operate in the
direction of rotation. Switching the motor into the blocked direction of rotation, i.e. the wrong direction of
rotation, may cause damage.
Back stops work from a speed of approx. 800 min
-1
without wear. To avoid impermissible heating and
faster wear of the back stop, back stops must not be operated with a speed below 800 min
-1
. This must
be observed for motors having a frequency of 50 Hz and a pole number of ≥ 8 as well as for motors
used with a frequency inverter.
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3.4.5 Brake
Motors having the additional labelling BRE (e.g. 80LP/4 3D
BRE 10
) are equipped with a brake and
have to be monitored via the installed temperature sensors. The triggering of the temperature sensor of
one of the components (motor or brake) must lead to safe shut-down of the entire drive. The PTC
resistors of motor and brake must be connected in series.
If the motor is operated via a frequency inverter, an external fan must be used in the case of stator
supply frequencies below 25 Hz. Operation without an external fan in case of stator supply frequencies
below 25 Hz is not permitted.
The brake may be used as a holding brake with up to 4 switching cycles per hour.
An optional manual brake release (with lockable manual release lever, where required) must only be
used if there is no explosive dust atmosphere.
NOTICE! Also observe the operating instructions of the brake!
The DC voltage supply of the brake is realised via a rectifier in the motor terminal box or via direct supply
with DC voltage. The brake voltage indicated on the name plate must be complied with.
The power supply lines and the temperature sensor line must not be installed together in one cable.
Check the brake’s functionality before commissioning. There must be no grinding noises as
impermissible heating may occur.