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APPENDIX
A.2 Instructions for UL and cUL
(Conforming standard UL 508C, CSA C22.2 No.274-13)
A.2.1 General precautions
The bus capacitor discharge time is 10 minutes. Before starting wiring or inspection, switch power off, wait for more than 10 min-
utes, and check for residual voltage between terminal P/+ and N/- with a meter etc., to avoid a hazard of electrical shock.
A.2.2 Installation
FR-A820/A840/A842 inverters
These types of inverter have been approved as products for use in enclosure and approval tests were conducted under the follow-
ing conditions.
Design an enclosure so that the inverter surrounding air temperature, humidity and atmosphere satisfy the specifications.
(Refer to page 3.)
Wiring protection (FR-A820/A840 inverters)
For installation in the United States, Class T, Class J, Class CC, or Class L fuse, UL 489 Molded Case Circuit Breaker (MCCB), or Type E
combination motor controller must be provided, in accordance with the National Electrical Code and any applicable provincial
codes (refer to the tables on page 57 and below).
For installation in Canada, Class T, Class J, Class CC, or Class L fuse, UL 489 Molded Case Circuit Breaker (MCCB) or Type E combina-
tion motor controller must be provided in accordance with the Canada Electrical Code and any applicable provincial codes (refer to
the tables on page 57 and below).
For the FR-A820 series, Class T, Class J, or Class CC fuse, UL 489 Molded Case Circuit Breaker (MCCB), or Type E combination motor
controller must be provided (refer to the tables on page 57 and below).
FR-A820-m-R2R
Type E combination motor
*1
controller
FR-A840-m-R2R
Type E combination motor
*1
controller
*1
For UL/cUL certification, use the following product:
Model
MMP-T32
*2
Suitable for use in a circuit capable of delivering not more than 50 or 25 kA rms symmetrical amperes, 480Y/277 volts maximum when
protected by the type E combination motor controllers indicated in the above table.
Wiring protection (FR-A842 inverters)
For wiring protection of the converter unit (FR-CC2) refer to "FR-A802-R2R Instruction Manual (Hardware)".
A.2.3 Wiring of the power supply and 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) and output (U, V, W) terminals of the inverter use the UL-listed copper wires (rated at 75°C)
and round crimping terminals. Crimp the crimping terminals with the crimping tool recommended by the terminal maker.
A.2.4 Short circuit ratings
O 200 V class
Suitable for use in a circuit capable of delivering not more than 100 kA rms symmetrical amperes, 240 V maximum.
O 400 V class
Suitable for use in a circuit capable of delivering not more than 100 kA rms symmetrical amperes, 500 V maximum.
58
Maximum current rating [A]
*2
Maximum SCCR [kA]
Maximum current rating [A]
*2
Maximum SCCR [kA]
Manufacturer
Rated voltage, V AC
Mitsubishi Electric Corp.
480Y/277
WARNING
00046
00077
00105
00167
(0.4K)
(0.75K)
(1.5K)
(2.2K)
8
13
18
25
50
50
50
25
00023
00038
00052
00083
(0.4K)
(0.75K)
(1.5K)
(2.2K)
4
6.3
8
13
50
50
50
50
00340
00250
(5.5K)
(3.7K)
or
higher
32
—
25
—
00310
00126
00170
00250
(11K)
(3.7K)
(5.5K)
(7.5K)
or
higher
18
25
32
—
50
25
25
—
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