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4. Checking the motors for suitability
Often, it is not known whether the motor installed is equipped with mechanical
or electronic limit switches.
Carry out the following measurement using a voltmeter:
• Measure the actual mains voltage U
• Go to the measured mains voltage on the left side of the diagram opposite.
• Draw a straight line from the value found through the center M to the
• Measure the motor voltage U
28
Therefore: Check the motor first for suitability.
Some motors with mechanical limit switches tend to build up a
high motor voltage in operation which may irreparably damage the
RolloTec
®
'Standard' insert without neutral conductor. Checking is
therefore effected with a commercial mechanical shutter switch
(possibly still installed) and not with the 'Standard' insert without
neutral conductor.
.
N
righthand axis. The intersection of the line and the right axis is the maximum
permissible motor voltage U
.
M
in the UP and DOWN direction on the
M
installed mechanical shutter switch. The maximum value as determined
above must not be exceeded when the measurements are made.
GB
Example
Example:
The measured mains voltage U
the left through the center of the diagram (M) to the right side with motor
voltage U
. The the maximum permissible motor voltage in this case is 404 V.
M
The voltages measured for the UP and DOWN directions must therefore be
below 404 V.
Approximate values for typical maximum motor voltages U
U
max. U
n
m
the mains voltage U
207 V
380 V
215 V
393 V
220 V
403 V
225 V
412 V
230 V
420 V
235 V
429 V
240 V
438 V
245 V
447 V
253 V
460 V
is 221 V. Draw a straight line from 221 V on
N
as a function of
M
are set out in the table opposite.
N
29
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