37
Connection of stand-alone option units
2
WIRING
(2) Connection with the MT-HC (75K or more)
*1 Remove the jumper across terminals R-R1, S-S1 of the inverter, and connect the control circuit power
supply to the R1 and S1 terminals. The power input terminals R/L1, S/L2, T/L3 must be open. Incorrect
connection will damage the inverter. (E.OPT (option alarm) will occur. (Refer to page 244.)
*2 Do not insert the MCCB between terminals P/+ − N/- (P/+ − P/+, N/- − N/-). Opposite polarity of terminals
N, P will damage the inverter.
*3 Use Pr. 178 to Pr. 189 (input terminal function selection) to assign the terminals used for the X10 (X11) signal.
(Refer to page 101.) For communication where the start command is sent only once, e.g. RS-485
communication operation, use the X11 signal when making setting to hold the mode at occurrence of an
instantaneous power failure.
(Refer to page 99.)
*4 Connect the power supply to terminals R1 and S1 of the MT-HC via an insulated transformer.
CAUTION
⋅ Use sink logic (factory setting) when the MT-HC is connected. The MT-HC cannot be connected when source logic is
selected.
⋅ The voltage phases of terminals R/L1, S/L2, T/L3 and terminals R4, S4, T4 must be matched.
⋅ When connecting the inverter to the MT-HC, do not connect the DC reactor provided to the inverter.
Three-phase
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