1 . M P U U n i ts
MN05003006E For more informat ion visit :
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1-31
The Relay Output Circuit Wiring
2
3
4
9
C0 Y0
Y1
C1
Y2 Y3
C2
8
MC1
7
3
2
6
5
1
1. DC power supply
2. Emergency stop: Uses external switch
3.
Fuse: Uses 5 ~ 10A fuse at the shared terminal of output contacts to protect the
output circuit.
4. Flywheel diode: To extend the life span of contact *1
5. AC power supply
6. Incandescent light (resistive load)
7. Manually exclusive output *3
8. Varistor: To reduce the interference on AC load *2
9. Empty terminal: no in use
*1: For switching direct current on inductive loads, a reverse-current protection diode should
be installed in parallel with the load. The relay contact life decreases significantly if this is
not done.
The reverse-current protection diode needs to satisfy the following specifications.
- The diode is rated for maximum reverse voltage of 5~10 times the load voltage.
- The forward current is more that the load current
*2: For switching AC on inductive loads, a surge absorber (0.1uF + “100ohm to 120ohm”)
should be installed in parallel with the load. The relay contact life decreases significantly if
this is not done.
*3: Ensure all loads are applied to the same side of each ELC output, see above figure. Loads
which should NEVER simultaneously operate (e.g. direction control of a motor), because
of a critical safety situation, should not rely on the ELC’s sequencing alone. Mechanical
interlocks MUST be fitted to all critical safety circuits.
The Transistor Output Circuit Wiring
MC1
2
3
1
C0 Y0
Y1 C2 Y2 Y3
4
5
3
4
C1
