Mitsubishi Electric A800 Instruction Manual page 111

NOTE
• The internal accumulated heat value of the electronic thermal relay function is reset by inverter power reset and reset signal
input. Avoid unnecessary reset and power-OFF.
• When the inverter is used to drive a multi-pole motor or a dedicated motor, install an external thermal relay (OCR) between
the inverter and the motor. Note that the current indicated on the motor rating plate is affected by the line-to-line leakage
current (refer to the FR-A800 Instruction Manual (Detailed)) when selecting the setting for an external thermal relay.
• The cooling effect of the motor drops during low-speed operation. Use a thermal protector or a motor with built-in thermistor.
• 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 such case, use an external thermal relay.
• A dedicated motor cannot be protected by an electronic thermal O/L relay. Use an external thermal relay.
• Motor over temperature sensing is not provided by the drive.
Rated specifications per inverter
The following table shows the rated specifications per inverter. (For the rated specifications for operating two or three inverters
in parallel, refer to page 100.)
Model FR-A842-[ ]-P
Applicable motor capacity (kW)
Rated capacity (kVA)

Rated current (A)
Overload current rating

Rated voltage

DC power supply voltage
Control power supply auxiliary input
Permissible control power supply auxiliary input fluctuation
Protective structure (IEC 60529)
Approx. mass (kg)

The applicable motor capacity indicated is the maximum capacity applicable for use of the Mitsubishi 4-pole standard motor.

The rated output capacity indicated assumes that the output voltage is 440 V.

The % value of the overload current rating indicated is the ratio of the overload current to the inverter's rated output current. For repeated duty,
allow time for the inverter and motor to return to or below the temperatures under 100% load.

The maximum output voltage does not exceed the power supply voltage. The maximum output voltage can be changed within the setting range.
However, the maximum point of the voltage waveform at the inverter output side is the power supply voltage multiplied by about

FR-DU08: IP40 (except for the PU connector section)

For the power voltage exceeding 480 V, set Pr.977 Input voltage mode selection. (For details, refer to the FR-A800 Instruction Manual
(Detailed).)
110
APPENDIX
LD

ND (initial setting)
LD
ND (initial setting)
LD
ND (initial setting)
LD
ND (initial setting)

400K
09620
360 400
320 360
470 528
417 470
692.8 769.6
616 692.8
120% 60 s, 150% 3 s (inverse-time characteristics) at surrounding air
temperature of 50°C
150% 60 s, 200% 3 s (inverse-time characteristics) at surrounding air
temperature of 50°C
Three-phase 380 to 500 V
430 to 780 VDC
Single phase 380 to 500 V 50/60 Hz
Frequency 5%, voltage 10%
Open type (IP00)
243 243
450K 500K
10940 12120
450
400
586
528
875.2
769.6

243
.