Wiring Of The Main Circuit - Mitsubishi Electric FR-F500 Instruction Manual

2.2.2 Wiring of the main circuit

(1) Wiring instructions
1) Power must not be applied to the output terminals (U, V, W) of the inverter. Otherwise the inverter will be
damaged.
2) After wiring, wire off-cuts must not be left in the inverter.
Wire off-cuts can cause an alarm, failure or malfunction. Always keep the inverter clean.
When drilling mounting holes in a control box etc., exercise care to prevent chips and other foreign matter
from entering the inverter.
3) Use cables of the recommended size for wiring to make the voltage drop 2% or less.
If the wiring distance is long between the inverter and motor, a main circuit cable voltage drop will cause the
motor torque to decrease especially at the output of a low frequency. (The selection example at the wiring
length of 20m is given on 15 page.)
4) Use thick cables to make a voltage drop of 2% or less.
If the wiring distance is long between the inverter and motor, a main circuit cable voltage drop will cause the
motor torque to decrease especially at the output of a low frequency.
5) Electromagnetic wave interference
The input/output (main circuit) of the inverter includes harmonic components, which may interfere with the
communication devices (such as AM radios) used near the inverter. In this case, install the FR-BIF optional
radio noise filter (for use in the input side only) or FR-BLF line noise filter to minimize interference.
6) Do not install a power capacitor, surge suppressor or radio noise filter (FR-BIF option) in the output side of
the inverter.This will cause the inverter to trip or the capacitor and surge suppressor to be damaged. If any
of the above devices are installed, immediately remove them. (Connect the FR-BIF optional radio noise
filter in the primary side of the electromagnetic contactor.)
7) When rewiring after operation, make sure that the POWER lamp has gone off, and when more than 10
minutes have elapsed after power-off, check with a tester that the voltage is zero. After that, start rewiring
work. For some time after power-off, there is a dangerous voltage in the capacitor.
Do not use residual current protective device as the only protection against indirect
contact.
Protective earth connection is essential.
Do not connect more than 2 wires on the protective earth terminal.
Use contactor and no fuse breaker EN/IEC standard compliant.
Use transformer or surge absorber EN/IEC standard compliant.
Notes on Grounding
• Leakage currents flow in the inverter. To prevent an electric shock, the inverter and motor must be
grounded (200V class... class C grounding, grounding resistance 100Ω or less, 400V class... class D
grounding, grounding resistance 10Ω or less.).
• Use the dedicated ground terminal to ground the inverter. (Do not use the screw in the case, chassis, etc.)
• The ground cable should be 38 mm
close to the inverter as possible.
CAUTION
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or more thick, and as short as possible. The grounding should be as
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INSTALLATION AND WIRING
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