Wiring Instructions - Mitsubishi Electric FR-D720S SC EC Instruction Manual

Wiring
3.4.2

Wiring instructions

● Use shielded or twisted cables for connection to the control circuit terminals and run them
away from the main and power circuits (including the 230V relay sequence circuit).
● Use two or more parallel micro-signal contacts or twin contacts to prevent a contact faults
when using contact inputs since the control circuit input signals are micro-currents.
Micro signal contacts
● Do not apply a voltage to the contact input terminals (e.g. STF) of the control circuit.
● Always apply a voltage to the alarm output terminals (A, B, C) via a relay coil, lamp, etc. In
no way must a voltage be short-circuited by these relay contacts.
● It is recommended to use the cables of 0.3–0.75mm² gauge for connection to the control
circuit terminals.
● The wiring length should be 30m maximum.
● Do not short terminal PC and SD. Inverter may be damaged.
FR-D700 SC EC
Fig. 3-14:
Contacts
Twin contacts
Control circuit specifications
I001021E
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