Mitsubishi Electric FR-A700 Series, Техническое руководство

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553
SELECTION
S
E
LECTION
3
* 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 ].
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 a 100% continuous torque
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 constant-torque motor, this
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.
FR-A740- ‡‡ K 75 90 110 132 160 185 220 250 280 315 355 400 450 500
Rated fuse voltage(V)
500V or more
Fuse maximum
allowable
rating (A)*
Without power factor
improving reactor
— — — — — — — — — — — — — —
With power factor
improving reactor
300 350 400 500 600 700 800 900 1000 1100 1200 1350 1500 1800
Molded case circuit breaker (MCCB)
Maximum allowable rating (A)*
350 450 500 600 800 800 1000 1200 1200 1200 1600 1600 2000 2000
Electronic thermal relay
function for transistor
protection
52.5%
105%
50
100
150
60
120
180
240
50
60
70
6Hz
20Hz
10Hz
6Hz
0.5Hz
30Hz or more*
3
20Hz
10Hz
0.5Hz
[ Pr. 9 ] = 50% setting
of inverter rating*
1.2
[ Pr. 9 ] = 100% setting
of inverter rating*
2
(s) unit display in this region
(min) unit display in
this region
Operation time (min)
Operation time (s)
Characteristic when
electronic thermal relay
function for motor
protection is turned off
(When [
Pr. 9 setting] is
0(A))
30Hz
or more*
3
Operation region
Region on the right of
characteristic curve
Non-operation region
Region on the left of
characteristic curve
Inverter output current (%)
(% to the inverter rated output current)
Electronic thermal relay function operation
characteristic