54
Electric Actuator
Rev 4 – MAY 2019 OMMGGE00217
5 Fit and Tension the Timing Belt.
• Fit the Timing Belt over the two Pulleys taking care not to turn
them excessively.
• Move the Hall Sensor to tension the Timing Belt and tighten the
two cap screws (6). The belt should be tight enough to take up
the slack, but no tighter. Belt tensioning tool, AMOT part number
81573X, can be used to aid sensor positioning.
6 Hall Sensor Fine Alignment.
• Using the handwheel, turn the actuator to each end stop and note
the voltmeter readings. Turn the actuator until the voltmeter
indicates the centre position of the two values.
• The voltmeter should indicate 2.5 V ± 0.1 V. If it does not, loosen
the cap screw (18) and turn the Position Indicator Shaft Pulley
(19) until the value is achieved then retighten the cap screw to a
torque 1.8Nm (18).
7 Referring to Fig 15 (page 43), fit the two or four Belleville washers (24)
onto the Position Indicator Shaft as indicated below:
8 Fit the Position Indicator Disc (25) and secure with the screw (26).
Ensure that the position of the Actuator is indicated correctly. If not
loosen the screw (26), turn the Disc and retighten the screw.
9 Perform a calibration procedure (Positioner option fitted only). Refer to
Section 4.7, page 38).
4.9.9 Anti-Condensation Heater Replacement
WARNING
Lethal voltages are exposed when the actuator cover is removed,
presenting an electric shock hazard to personnel. Electrical power
supplies must be isolated from the actuator before the cover is
removed.
Remove Heater
1 Switch off and isolate the actuator electrical power supply.
2 Loosen the socket head cap screws and carefully lift off the actuator
cover.
3 Unscrew the motor strap and remove the bracket complete with heater
(Fig 19).
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