E L C O p e r a t i o n M a n u a l
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MN05003006E
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Overload Capacity of the Output Terminal
Every output contact has an overload capacity that is twice the rated current for 5 minutes.
The common circuit has an overload capacity of 1.5 times the rated current for 2 minutes. If
the range is exceeded, a failure of the contact may result. .
There are two types of output modules for the ELC: the relay and the transistor. Refer to
Functions & Specifications for relevant electric specifications.
Isolation Circuit: the photocoupler is utilized as the signal isolation between the internal
circuit of the ELC and output module.
The Relay Output Circuit Wiring
2
3
4
C0 Y0
Y1
C1
Y2 Y3
C2
Y4 Y5
9
MC1
MC2
8
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. Incandescent light (resistive load)
6. AC power supply
7. Manually exclusive output *3
8. Neon indicator
9. Varistor: To reduce the interference on AC load *2
*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 the figure above.
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.
