Motors – Operating and Assembly Instructions
44 B 1091 en-3118
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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 with the additional code RLS (e.g. 80S/4 3D RLS) are equipped with a back stop. For motors
with a back stop, the direction of rotation is indicated by an arrow on the fan cover. The head of the
arrow points in the direction of the drive shaft. When connecting the motor and during motor control, it
must be ensured that the motor can only operate in the rotation direction, e.g. by means of a rotary field
test. Switching of the motor into the blocked direction of rotation, i.e. the wrong direction of rotation may
cause damage.
Back stops operate without wear above a speed of approx. 800 rpm. To prevent excessive heating and
premature wear of the back stop, back stops must not be operated below a speed of 800 rpm. This must
be observed for motors with a frequency of 50 Hz and pole numbers ≥ 8 as well as for motors with a
frequency inverter.
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3.4.5 Brake
Motors with the additional labelling BRE (e.g. 80S/4 3D BRE 10) are equipped with a brake and must
be monitored with the integrated temperature sensor. Triggering of the temperature sensor of one of the
components (motor or brake) must result in the safe shut-down of the entire drive unit. The motor and
brake thermistors must be connected in series.
If the motor is operated with a frequency inverter, an external fan must be used for stator frequencies
less than 25 Hz. Operation with stator frequencies of 25 Hz is not permissible without an external fan.
The brake may be used as a holding brake with up to 4 activations per hour.
An optional manual release (with a lockable manual release lever) may only be used if no explosive
atmosphere is present.
NOTICE! The operating instructions for the brake must also be observed.
The DC supply for the brake is via a rectifier in the motor terminal box or via a direct DC supply. The
brake voltage which is stated on the type plate must be complied with.
The power supply cables must not be laid in the same cable as the temperature sensor lines. The
function of the brake must be checked before commissioning. No rubbing noises may occur, as
impermissibly high heating could occur.
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