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7. Install temporary grounding as required by the local regulations.
8. Ask the person in control of the electrical installation work for a permit to work.
Checking the insulation of the resistor circuit
Do not make any voltage tolerance or insulation resistance tests on the brake chopper
modules. Every brake chopper module has been tested for insulation between the main
circuit and the chassis at the factory.
Check the insulation of the brake resistor assembly as follows:
1. Check that the resistor cable is connected to the resistor, and disconnected from the
chopper output terminals R+ and R-.
2. At the brake unit end, connect the R+ and R- conductors of the resistor cable together.
Measure the insulation resistance between the combined conductors and the PE
conductor by using a measuring voltage of 1 kV DC. The insulation resistance must be
higher than 1 Mohm.
ohm
General notes
￭
Printed circuit boards
WARNING!
Use a grounding wrist band when you handle printed circuit boards. Do not touch
the boards unnecessarily. The boards contain components sensitive to electrostatic
discharge.
￭
Optical components
WARNING!
Obey these instructions. If you ignore them, damage to the equipment can occur.
•
When you unplug the fibre optic cables, always hold the connector, not the cable itself.
•
Do not touch the ends of the fibers with bare hands as the ends are extremely sensitive
to dirt.
•
Do not bend the fiber optic cables too tightly. The minimum allowed bend radius is
35 mm (1.4").
R+
R-
Electrical installation 43
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