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User Manual
MP40E, version 1.2.0, valid for M-227.10, M-227.25, M-227.50
CBo, 5/20/2019
Physik Instrumente (PI) GmbH & Co. KG, Auf der Roemerstrasse 1, 76228 Karlsruhe, Germany
Page 18 / 26
Phone +49 721 4846-0, Fax +49 721 4846-1019, Email
Unblocking the actuator electrically
1.
Connect the switched
off
power supply to the M-227. The required connections depend
on the direction of motion:
−
For positive motion (p. 9):
Pin 2: +15 V
Pin 9: GND
−
For negative motion (p. 9):
Pin 2: GND
Pin 9: +15 V
2.
Apply a voltage of 15 V DC to the motor of the M-227 for a short moment (less than
2 seconds).
Unblocking the Actuator by Hand
If the M-227 cannot be unblocked electrically (p. 17), you need to unblock the M-227 by hand.
Requirements
You have disconnected the M-227 from the electronics.
You have read and understood the “General Notes on Troubleshooting” (p. 17).
Tools and accessories
1.2 mm hex key
Unblocking the actuator by hand
1.
Remove the set screw located about in the middle of the motor housing (p. 9). This
screw clamps the motor/gearhead assembly inside the housing.
2.
Hold the M-227 with both hands and turn the motor housing CCW relative to the
micrometer housing (p. 9) until it breaks loose. Look for the small hole (Ø 2.5 mm) in
the motor housing near the edge to the micrometer housing. This hole allows access to
two set screws which clamp the bellows coupling to the spindle. Turn the motor
housing CCW until you see the first set screw through the hole and untighten it.
3.
Turn the motor housing until you see the second set screw and untighten it.
4.
Turn the motor housing CCW until you can pull it off the micrometer housing.
Important note:
To prevent damage, avoid bending and pull forces on the bellows
coupling.
5.
Turn the spindle CW or CCW in order to unblock the jammed spindle.
6.
Reassemble the M-227.