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AC Hoist Motor, Brake, and Velocity Encoder
iControl AC
2
AC Hoist Motor, Brake, and Velocity Encoder
This section contains instructions for:
• Checking the hoist motor for insulation breakdown or short to ground
• Wiring the hoist motor to the controller
• Verifying iField module or low-current brake resistance and wiring the brake
• Installing the velocity encoder
Checking the Hoist Motor
If the job reuses existing rotating equipment, the equipment must be checked for insulation
breakdown before proceeding.
1. Disconnect all motor and brake wiring.
2. Perform an insulation test between these wires and the frame of the related equipment
using a Megohm meter, or as directed by the manufacturer, to subject the insulation to
the same high voltages that would be present during elevator operation.
3. A minimum insulation resistance of 100k Ohms is required.
4. Correct any insulation problems before proceeding with installation. Insulation prob-
lems may indicate a serious problem in the equipment.
Wiring the Hoist Motor to the Controller
Incoming power to the controller and outgoing power wires to the motor must be in their
respective grounded conduit.
It is very important that AC motor wires be kept separate from control wires both inside and
outside the controller. The encoder or tachometer wiring must use a separate grounded con-
duit. Use a shielded power cable between the motor drive and the AC Motor stator connections
to reduce RFI/EMI noise (Siemens Protoflex - EMV or equivalent). The shield must be termi-
nated to earth ground at both ends.
Verifying Brake Current Resistance
High current brake systems use a brake (iField) module to control the brake.
1. With the brake leads disconnected, measure resistance through the brake coil.
2. Inside the controller cabinet, locate the screws, one at the top and one at the bottom
right corner of the iPower box (the enclosure the iBox is mounted to). Turn the screws
counter-clockwise to their stops and open the enclosure (it is hinged on the left).
3. Refer to job print drawing D2. Toward the right-top of the enclosure, locate the large
ceramic resistor labeled RB.
4. Check the resistance across RB. As an initial working value, RB resistance should be
about three times (3 X) the resistance measured across the brake coil.
During adjustment, the resistance across RB may be further adjusted to achieve smooth brake setting.
Too little resistance causes the brake to remain picked for too long. Refer to your job prints for instruc-
tions.
5. If necessary, adjust RB resistance by loosening and sliding the center-tap up or down.
When the resistance is correct, retighten the center tap.
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