Wiring Of The Control Circuit - Mitsubishi Electric FR-A500 Instruction Manual

2.2.3

Wiring of the control circuit

(1) Wiring instructions
1) Terminals SD, SE and 5 are common to the I/O signals and isolated from each other. Do not earth
(ground) these terminals. Avoid connecting the terminals SD and 5 and the terminals SE and 5.
2) Use shielded or twisted cables for connection to the control circuit terminals and run them away from the
main and power circuits (including the 200V relay sequence circuit).
3) Since the control circuit input signals are micro currents, use two or more parallel micro signal contacts or
a twin contact to prevent a contact fault.
4) It is recommended to use the cables of 0.75mm
If the cable gauge used is 1.25mm
running or the cables are run improperly, resulting in an operation panel or parameter unit contact fault.
(2) Terminal block layout
• NA version
In the control circuit of the inverter, the terminals are arranged as shown below:
Terminal screw size: M3.5
Tightening torque: 1.2N
•EC version
Terminal screw size: M3
Tightening torque: 1.2N
A B
SE RUN
<Wiring procedure>
1) For the wiring of the control circuit, strip the sheaths of the cables and use them as they are.
Strip the sheath to the following dimension. A too long stripping dimension may cause a short circuit with
the neighboring cable. A too short dimension may cause cable disconnection.
2) Loosen the terminal screw and insert the cable into the terminal.
3) Tighten the screw to the specified torque.
Undertightening can cause cable disconnection or malfunction. Overtightening can cause a short circuit or
malfunction due to the screw or unit damaged.
Note: Wire the stripped cable by twisting it to prevent it from becoming loose. (Do not plate the cable with
solder.)
Note: 1. Use a MCCB (Moulded case circuit breaker) or fuse on the inverter input (primary) side.
2. Make sure that the control circuit terminal wiring does not touch power circuit terminals (or
screws) or conducting power circuit.
2
2
or more, the front cover may be lifted when there are many cables
m
⋅
A B C PC AM
RL RM RH RT
SE RUN SU IPF OL
m
⋅
C SD AM 10E 10 2
SU LPF OL FU STOP MRS
INSTALLATION AND WIRING
gauge for connection to the control circuit terminals.
10E 10 2 5 4 1
AU STOP MRS RES SD FM
FU SD STF STR JOG CS
5 4 1 RL RM
RES PC STF STR JOG
6mm ± 1mm
21
RH RT AU
CS FM SD
2