2-18
2-2 Wiring
SYSDRIVE MX2 Series USER'S MANUAL (3G3MX2-Axxxx)
2
Design
Wiring Control Circuit Terminals
Wiring and Arranging a Control Circuit Terminal Block
Terminals SC and PC are common terminals for input/output signals. They are isolated each
other. Do not short-circuit or ground these common terminals.
Do not ground these common terminals via external equipment and check the external
equipment ground conditions.
 Connect diodes when wiring input/output signals for multiple inverters, because sneak circuit
paths are created.
For wiring of each control circuit terminal, use a twisted-pair shielded cable and connect the
shielded cable to each common terminal.
The control circuit terminal connection cable should be 20 m or shorter. Separate the control
circuit terminal connection cables from the main circuit cable (power cable) and the relay
control circuit cable. If the two cables must be crossed with each other, make sure they bisect
at right angles. Otherwise, the Inverters may malfunction.
For connection of the thermistor input terminal, connect the twisted wires to terminal SC
individually, and separate them from other SC common cables. Since a weak current flows
through the thermistor, the thermistor connection cable must be separated from the main
circuit cable (power cable).The thermistor connection cable should be 20 m or shorter.
When providing contacts for control circuit terminals (multi-function input terminals, etc.), use
a relay that will not cause contact failure even when the current or voltage is weak, such as a
relay with cross-bar twin contacts.
To use a relay for a multi-function output terminal, connect a surge-absorbing diode in parallel
with the coil.
Do not short-circuit the analog power supply terminals (FS-SC) and/or the interface power
supply terminals (P24 and SC). Doing so could result in failure of the Inverter.
The control circuit terminal block has two rows of terminals at top and bottom. Since wiring the
top terminals first makes it difficult to wire the bottom terminals, wire the bottom terminals first.
After the wiring, gently pull the wires to confirm that they are securely connected.
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