Instructions for UL and cUL
(Standard to comply with: UL 508C, CSA C22.2 No.274-13)
The below types of inverter have been approved as products for use in enclosure.
Design the enclosure so that the surrounding air temperature, humidity and ambience of the inverter will satisfy the
specifications. (Refer to
Branch circuit protection
For installation in the United States, Class T, Class J, Class CC, or Class L fuse must be provided, in accordance with the
National Electrical Code and any applicable local codes.
For installation in Canada, Class T, Class J, Class CC, or Class L fuse must be provided, in accordance with the Canadian
Electrical Code and any applicable local codes.
Rated fuse voltage (V)
Permissible fuse rating (A)
Wiring to the power supply and the motor
Refer to the National Electrical Code (Article 310) regarding the allowable current of the cable. Select the cable size for 125%
of the rated current according to the National Electrical Code (Article 430).
For wiring the input (R/L1, S/L2, T/L3) terminals of the converter unit and output (U, V, W) terminals of the inverter, use the UL
listed copper, stranded wires (rated at 75°C) and round crimp terminals. Crimp the terminals with the crimping tool
recommended by the terminal manufacturer.
Short circuit ratings
Suitable for use in a circuit capable of delivering not more than 100 kA rms symmetrical amperes, 500 V maximum.
Motor overload protection
When using the electronic thermal relay function as motor overload protection, set the rated motor current in Pr.9 Electronic
thermal O/L relay.
This function detects the overload (overheat) of the motor and shut off the inverter output by stopping the operation of the
transistor at the inverter output side. (The operation characteristic is shown below.)
• When using the Mitsubishi Electric constant-torque motor
Set "1, 13 to 16" in Pr.71. (This setting enables the 100% constant-torque characteristic in the low-speed range.)
7.4 Instructions for UL and cUL
500 V or more