Wiring Precautions - Mitsubishi Electric FR-E800-HVC Series Instruction Manual

2.6.4

Wiring precautions

• It is recommended to use a cable of 0.2 to 0.8 mm
• The wiring length should be 30 m at the maximum.
• Do not short across terminals PC and SD. Doing so may cause an inverter failure.
• Use two or more parallel micro-signal contacts or twin contacts to prevent contact faults when using contact inputs since
the control circuit input signals are micro-currents.
Micro signal contacts
• To suppress EMI, use shielded or twisted cables for the control circuit terminals and run them away from the main and
power circuits (including the 200 V relay sequence circuit). For the cables connected to the control circuit terminals,
connect their shields to the common terminal of the connected control circuit terminal. When connecting an external power
supply to terminal PC, however, connect the shield of the power supply cable to the negative side of the external power
supply. Do not directly earth (ground) the shield to the enclosure, etc.
• Always apply a voltage to the fault output terminals (A, B, and C) via a relay coil, lamp, etc.
• When a relay coil is connected to the output terminals, use one with a surge absorbing function (reflux diode). When the
voltage application direction is incorrect, the inverter will be damaged. Pay attention to the diode direction or other
precautions to avoid incorrect wiring.
RUN
SE
Inverter
56
2. Installation and Wiring
2.6 Control circuit
Twin contacts
RA
24VDC power supply
or
12V power supply
2
for the connection to the control circuit terminals.