8-8
8.4 Terminal Specifications
8.4.1 Terminal functions
For details about the main and control circuit terminals, refer to Chapter 2, Section 2.3.5 and
Section 2.3.7 (Table 2.8), respectively.
8.4.2 Connection diagram in operation by external signal inputs
(Note 1) Install a recommended molded case circuit breaker (MCCB) or a residual-current-operated
protective device (RCD)/earth leakage circuit breaker (ELCB) (with overcurrent protection) in the
input (primary) circuit of the inverter to protect wiring. At this time, ensure that the circuit breaker
capacity is equivalent to or lower than the recommended capacity.
(Note 2) A magnetic contactor (MC) should, if necessary, be mounted independent of the MCCB or ELCB
to cut off the power fed to the inverter. Refer to page 9-2 for details. MCs or solenoids that will be
installed close to the inverter require surge absorbers to be connected in parallel to their coils.
(Note 3) For an inverter connected to the power supply of 500 kVA or more (50 kVA or more for single-
phase 100 V class series), be sure to connect an optional DC reactor (DCR).
When connecting a DCR to the inverter, remove the jumper bar from terminals [P1] and [P+].
Note that the terminal assignment of single-phase 100 V class series of inverters differs that of
the above diagram. For details about the terminal assignment, refer to Chapter 10 (page 10-1).
(Note 4) THR function can be used by assigning code "9" (Enable external alarm trip) to any of terminals
[X1] to [X3], [FWD] or [REV] (function code E01 to E03, E98, or E99). For details, refer to Chapter
5.
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