Mitsubishi Electric FR-D720S-008SC Original Instruction page 34

APPENDIX
Environment
Ambient temperature
Ambient humidity
Maximum altitude
Wiring protection
Select a UL and cUL certified fuse with Class T fuse equivalent cut-off speed or faster with the appropriate rating for branch circuit
protection, or a UL489 molded case circuit breaker (MCCB) in accordance with the tables below.
FR-D720S- SC-EC (C)
Rated fuse voltage [V]
Without power factor
improving reactor
Fuse maximum
allowable rating [A] *
With power factor
improving reactor
Molded case circuit breaker (MCCB)
Maximum allowable rating [A] *
FR-D740- SC-EC (C)
Rated fuse voltage [V]
Without power factor
improving reactor
Fuse maximum
allowable rating [A] *
With power factor
improving reactor
Molded case circuit breaker (MCCB)
Maximum allowable rating [A] *
* Maximum allowable rating by US National Electrical Code. Exact size must be chosen for each installation.
Motor Overload Protection
The frequency inverters FR-D700 SC are equipped with a UL certified internal electronic thermal relay function.
When using the electronic thermal relay as motor overload protection, set the rated motor current to Pr. 9 Electronic thermal O/L relay.
Electronic thermal relay function operation characteristic
Pr. 9 = 50 % setting of
*1, 2
inverter rating
*3
or more
Inverter output current (%)
(% to the rated inverter current)
28
During Operation
–10 °C to +50 °C
90 % RH or less
(non condensing)
1000 m
008
15
15
15
012 022
6 10
6 10
15 15
Pr. 9 = 100 % setting of
*2
inverter rating
*3
or more
Operation region
Region on the right of
characteristic curve
Non-operation region
Region on the left of
characteristic curve
Characteristic when electronic
thermal relay function for motor
protection is turned OFF
(Pr. 9 = 0 (A))
Region for
transistor
protection
In Storage
–20 °C to +65 °C
90 % RH or less
(non condensing)
1000 m
014 025
240 V or more
20 20
20 20
15 15
036 050
480 V or more
15 20
10 15
15 15
This function detects the overload (overheat) of the motor,
stops the operation of the inverter's output transistor, and
stops the output.
When using the Mitsubishi Electric constant-torque motor
set "1" or any of "13", "50" or "53" in Pr. 71. This provides
a 100 % continuous torque characteristic in the low-speed
range. Set the rated current of the motor in Pr. 9.
*1
When 50 % of the inverter rated output current (current value)
is set in Pr. 9.
*2
The % value denotes the percentage to the inverter rated output
current. It is not the percentage to the motor rated current.
*3
When you set the electronic thermal relay function dedicated
to the Mitsubishi Electric constant-torque motor, this characteristic
curve applies to operation at 6 Hz or higher.
During Transportation
–20 °C to +65 °C
90 % RH or less
(non condensing)
10000 m
042 070
30 40
20 30
20 25
080 120
30 40
25 35
20 30
100
60
50
40
160
70
60
40