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Operating Instructions – Explosion-Proof AC Motors DR63/eDR63, DVE250/280
7
Changing the blocking direction for motors with backstop
Startup
Do not start up the motor in blocking direction (ensure proper connection of
power supply with motor). Note the direction of rotation of the output shaft and the
number of stages when mounting the motor on a gear unit. For inspection purposes, you
can operate the backstop once in blocking direction with half the motor voltage.
1. Remove the fan guard [1] and the fan [2]; remove the cap screws [3]
2. Remove the V-ring [4] and sealing flange with felt ring [5] (collect the grease for re-
use).
3. Remove the retaining ring [6] (not with DT71/80); additionally for DV(E)132M-160M:
remove the shims [10].
4. Pull the driver [8] and sprags [9] completely off using the tapped holes [7], turn them
by 180°, and press them back on.
5. Re-fill the grease.
6. Important: Do not exert pressure on or hit the wedge element train – risk of
damaging the material.
7. While pressing them back on, shortly before the sprag penetrates the outer ring,
slowly turn the rotor shaft by hand in the direction of rotation. Doing so lets the sprag
move into the outer ring more easily.
8. Install the remaining parts of the backstop by following steps 4. to 2. in reverse order.
Note the installation dimension "x" for the V-ring [4].
WARNING
Risk of crushing if the drive starts up unintentionally.
Severe or fatal injuries.
• Before starting work, isolate the motor and, if installed, the forced cooling fan from
the power supply.
• Safeguard against accidental startup.
• Carefully observe the steps described below.
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