Mitsubishi Electric FR-A700 Technical Manual page 519

FR-A740- K
Rated fuse voltage(V)
Without power factor
Fuse maximum
improving reactor
allowable
With power factor
rating (A)*
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.
(2) Wiring of the power supply and motor
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 ) and round crimping terminals.
Crimp the crimping terminals with the crimping tool
recommended by the terminal maker.
(3) Short circuit ratings
• 200V class
Suitable for use in a circuit capable of delivering
not more than 100kA rms symmetrical amperes
maximum, 264 Volts Maximum.
• 400V class
55K or less
Suitable for use in a circuit capable of delivering
not more than 100kA rms symmetrical amperes
maximum, 528 Volts Maximum.
75K or more
Suitable for use in a circuit capable of delivering
not more than 100kA rms symmetrical amperes
maximum, 550 Volts Maximum.
(4) Motor overload protection
This inverter is certified as a motor overload
protection device by UL. When using the electronic
thermal relay function 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 inverter rating*
1.2
70
30Hz
or more*
3
20Hz
60
10Hz
6Hz
0.5Hz
50
240
180
120
60
52.5% 105%
100
50
Inverter output current (%)
(% to the inverter rated output current)
75 90 110 132 160 185 220 250 280 315 355 400 450 500
— — —
300 350 400
350 450 500
[Pr. 9] = 100% setting
of inverter rating*
2
30Hz or more* 3
20Hz Operation region
Region on the right of
10Hz
characteristic curve
6Hz
Non-operation region
Region on the left of
0.5Hz
characteristic curve
Characteristic when
electronic thermal relay
function for motor
protection is turned off
(When [Pr. 9 setting] is
0(A))
Electronic thermal relay
function for transistor
protection
150
500V or more
— — — — —
500 600 700 800 900 1000 1100 1200 1350 1500 1800
600 800 800 1000 1200 1200 1200 1600 1600 2000 2000
This function detects the overload (overheat) of the
motor and trips. (The operation characteristic is
shown above)
• When using a Mitsubishi constant-torque motor
1) Set any of 1, 13 to 18, 50, 53, or 54 in [Pr. 71].
(This provides
characteristic in the low-speed range.)
2) Set the rated current of the motor in [Pr. 9].
*1 When a value 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 rated motor
current.
*3 When you set the electronic thermal O/L relay dedicated
to the Mitsubishi
characteristic curve applies to operation at 6Hz or higher.
Instructions
• 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 function. Install an external
thermal relay to each motor.
• When a 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 an external
thermal relay.
• Electronic thermal relay may not function when
5% or less of inverter rated current is set to
electronic thermal relay setting.
553
SELECTION
— — — — — —
a 100% continuous
constant-torque motor,
torque
this
3