136
(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 127)
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.
∗ Maximum allowable rating by US National Electrical Code. Exact size must be chosen for each installation.
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
⋅ The cables used should be 75°C copper cables.
⋅ Tighten the terminal screws to the specified torques.
Undertightening can cause a short or misoperation.
Overtightening can cause the screws and unit to be damaged, resulting in a short or misoperation.
⋅ Use the UL approved round crimping terminals. Crimp the terminals with the crimping tool recommended by the terminal
manufacturer.
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 41)
Appendix 3 Instructions for UL and cUL
FR-D720-K(C) 0.1 0.2 0.4 0.75 1.5 2.2 3.7 5.5 7.5 11 15
Rated fuse voltage(V) 240V or more
Fuse maximum
allowable rating
(A)∗
Without power factor
improving reactor
15 15 15 20 30 40 60 70 80 150 175
With power factor
improving reactor
15 15 15 20 20 30 50 60 70 125 150
Molded case circuit breaker (MCCB)
Maximum allowable rating (A)*
15 15 15 15 20 25 40 60 80 110 150
FR-D740-K(C) 0.4 0.75 1.5 2.2 3.7 5.5 7.5 11 15
Rated fuse voltage(V) 480V or more
Fuse maximum
allowable rating
(A)∗
Without power factor
improving reactor
6 1015203040708090
With power factor
improving reactor
6 1010152535607090
Molded case circuit breaker (MCCB)
Maximum allowable rating (A)*
15 15 15 15 20 30 40 50 70
FR-D720S-K 0.1 0.2 0.4 0.75 1.5 2.2
Rated fuse voltage(V) 240V or more
Fuse maximum
allowable rating
(A)∗
Without power factor
improving reactor
15 20 20 30 40 60
With power factor
improving reactor
15 20 20 20 30 50
Molded case circuit breaker (MCCB)
Maximum allowable rating (A)*
15 15 15 20 25 40
FR-D710W-K 0.1 0.2 0.4 0.75
Rated fuse voltage(V) 115V or more
Fuse maximum
allowable rating
(A)∗
Without power factor
improving reactor
20 20 40 60
With power factor
improving reactor
20 20 30 50
Molded case circuit breaker (MCCB)
Maximum allowable rating (A)*
15 15 25 40
REMARKS
Safety stop function is not certified by UL.
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