Mitsubishi Electric 700 Series Installation Manualline page 31

Appendix 2 Instructions for UL and cUL
(Standard to comply with: UL 508C, CSA C22.2 No. 14)
1. General Precaution
The bus capacitor discharge time is 10 minutes. Before starting wiring or inspection, switch power off, wait for more than 10 minutes,
and check for residual voltage between terminal P/+ and N/- with a meter etc., to avoid a hazard of electrical shock.
2. Installation
The below types of inverter have been approved as products for use in enclosure and approval tests were conducted under the
following conditions. Design the enclosure so that the surrounding air temperature, humidity and ambience of the inverter will satisfy
the specifications (Refer to page 2).
Wiring protection
Integral solid state short circuit protection does not provide branch circuit protection. Branch circuit protection must be provided in
accordance with the National Electrical Code for the U.S. or the Canadian Electrical Code for Canada and any additional codes. As
specified, UL Class T fuses or any faster acting fuse with the appropriate rating or Listed UL 489 Molded Case Circuit Breaker
(MCCB) must be employed. (Refer to page 26)
3. Short circuit ratings
100V class
•
Suitable For Use in A Circuit Capable of Delivering Not More Than 100 kA rms Symmetrical Amperes, 132 V Maximum.
200V class
•
Suitable For Use in A Circuit Capable of Delivering Not More Than 100 kA rms Symmetrical Amperes, 264 V Maximum.
400V class
•
Suitable For Use in A Circuit Capable of Delivering Not More Than 100 kA rms Symmetrical Amperes, 528 V Maximum.
4. Wiring
For wiring the input (R/L1, S/L2, T/L3) and output (U, V, W) terminals of the inverter, use the UL Listed copper, stranded wires
(167°F)
(rated at 75°C ) and round crimping terminals. Crimp the crimping terminals with the crimping tool recommended by the
terminal maker.
5. Motor overload protection
When using the electronic thermal relay function as motor overload protection, set the rated motor current to Pr. 9 "Electronic thermal
O/L relay". (Refer to page 27)
NOTE
⋅ Protective function by electronic thermal relay function is reset by inverter power reset and reset signal input. Avoid
unnecessary reset and power-OFF.
⋅ When multiple motors are operated by a single inverter, protection cannot be provided by the electronic thermal relay
function. Install an external thermal relay to each motor.
⋅ When the difference between the inverter and motor capacities is large and the setting is small, the protective
characteristics of the electronic thermal relay function will be deteriorated. In this case, use an external thermal relay.
⋅ A special motor cannot be protected by the electronic thermal relay function. Use the external thermal relay.
⋅ If electric thermal is set to 5% or lower of the inverter rated current, electronic thermal may not operate.
REMARKS
Safety stop function is not certified by UL for the Safety stop function model.
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