MD500 User Manual                                         3. Electrical Installation
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DC Bus Terminals
ƕ The DC bus terminals, labeled (+) and (–), are signal terminals that carry a residual voltage for a period after the AC drive 
has been switched off. 
ƕ To avoid the risk of electric shock, wait for at least 10 minutes after the CHARGE indicator goes off before you touch the 
equipment.
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and above, DO NOT reverse the poles (+) and (–).
ƕ Do not use a cable length of more than 10 m to connect the DC bus terminals to the external MDBUN braking unit. Use 
twisted pair wires or close pair wires for this connection. 
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signal connection only.
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Regen Resistor
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internal braking unit.
ƕ To avoid the risk of equipment damage, do not use a cable length of more than 5 m to connect an external regen resistor.
ƕ To avoid the risk of ignition due to overheating of the regen resistor, do not place anything combustible around the regen 
resistor.
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AC Drive Output
Cable clamp of 
bare copper shield
Main circuit cables
Cable bracket
(optional)
Stick insulating tape around 
the bare copper shield 
above the cable clamp
Shield grounded
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