A6-8
6. IMPORTANT: After wiring, test insulation resistance of each Braking Transistor
Unit/Remote Mount Resistor Unit with a 900V megger as follows:
a. Disconnect leads between the Braking Transistor Unit and the drive. If
equipment with semiconductors is connected across terminals 1 & 2 of the
Braking Transistor Unit,
remove the wiring.
b. Connect common leads
(jumpers) across Braking
Transistor Unit terminals
N, P, Po, and B, and across
3 & 4, as shown in
Figure A6-6.
c. Measure the insulation
resistance at points a, b,
and c in Figure A6-6 with
the megger.
ADJUSTMENTS
7. ALL drives: Program L3-04 to " 0 ", to disable stall prevention during deceleration.
8. Only with Heat Sink Mount Resistor: Program L8-01 to " 1 ", to enable overheat
protection for the braking resistor.
OPERATION CHECK
9. During dynamic braking operation, verify that the "BRAKE" lamp inside the Braking
Unit is lit.
10. During dynamic braking operations, ensure that the required deceleration
characteristic is obtained. If not, contact MagneTek for assistance.
11. Reinstall and secure covers on the Braking Transistor Units, Remote Mount Resistor
Units, and the drive.
During normal operation, the Braking Transistor Unit and the Remote Mount
Resistor Unit enclosures must be kept closed, since high voltage is applied to
the dynamic braking circuit.
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