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3. WIRING
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3. WIRING
This chapter describes the wiring of the drive unit.
WARNING
Any person who is involved in the wiring of this equipment should be
fully competent to do the work. Otherwise, an electric shock or fire can
occur.
Always install the unit before wiring. Otherwise, an electric shock or
fire can occur.
Before restarting wiring after switching power "ON", make sure that the
motor is at a stop, wait for more than 10 minutes after switching power
"OFF", and confirm that the DC voltage across the DC terminals P/+
and N/- is low enough to do wiring. Immediately after power "OFF", the
DC terminals P/+, N/- are charged with more than 200V (residual
voltage of the internal capacitor). Therefore, an electric shock may
occur.
Even after power-off, the motor connection terminals U, V, W have high
voltages while the motor is running. Always start wiring after
confirming that the motor has stopped. Not doing so can cause an
electric shock.
CAUTION
Take measures to prevent peripheral sensors and equipment from
malfunctioning due to electromagnetic noises. Not doing so can cause
accidents.
Take measures to prevent peripheral power capacitors and generators
from overheating or being damaged due to power harmonics. Not
doing so can cause a fire.
Do not leave wire offcuts in the drive unit. Doing so can cause a fault,
failure or malfunction.
If the machine must not be restarted when power is restored after a
power failure, provide a magnetic contactor on the power supply side
and also make up a sequence which will not turn "ON" the start signal
automatically when power is restored.
Tighten the terminal screws to the specified torque. Undertightening
can cause an inter-terminal short circuit or malfunction. Overtightening
can cause the screws and unit to be damaged, resulting in a short
circuit, malfunction or the like.