Mitsubishi Electric FR-A872-E Instruction Manual page 40

• Converter unit (FR-CC2)
Terminal
Converter model
screw
FR-CC2-N[]
*2
size
450K to 630K M12 (M10)
• Inverter (common between ND rated and SLD rated)
Terminal
Inverter model
screw
FR-A872-[]
*2
size
05690 to 07150 M12 (M10)
*1 The recommended cable size is that of the cable (XLPE cable) with continuous maximum permissible temperature of 90°C. It assumes a
surrounding air temperature of 40°C or lower and in-enclosure wiring.
(Selection example mainly for use in Europe.)
*2 The screw size for terminals R/L1, S/L2, T/L3, U, V, W, P/+, N/-, and the earthing (grounding) terminal are shown.
Screw size for earthing (grounding) is indicated in parentheses.
The line voltage drop can be calculated by the following formula:
× wire resistance [mΩ/m] × wiring distance [m] × current [A]
Line voltage drop [V] =
Use a larger diameter cable (or a bus bar) when the wiring distance is long or when it is desired to decrease the voltage drop
(torque reduction) in the low speed range.
NOTE
• Tighten the terminal screw to the specified torque.
A screw that has been tightened too loosely can cause a short circuit or malfunction.
A screw that has been tightened too tightly can cause a short circuit or malfunction due to the unit breakage.
• Use crimp terminals with insulation sleeves to wire the power supply and motor.
• The creepage distance between terminals is 15.4 mm. When more insulation distance is required, secure a sufficient distance
or use insulating material for bus bars.
 Total wiring length
Connect one or more general-purpose motors within the total wiring length 500 m. (The wiring length should be 100 m or shorter
under Vector control.)
Total wiring length
When driving a 690 V class motor by the inverter, surge voltages attributable to the wiring constants may occur at the motor
terminals, deteriorating the insulation of the motor. In this case, use a 690 V class inverter-driven insulation-enhanced motor.
When the wiring length exceeds 100 m, set "4" (4 kHz) or less in Pr.72 PWM frequency selection (carrier frequency).
NOTE
• Especially for long-distance wiring, the inverter may be affected by a charging current caused by stray capacitances of the
wiring, leading to an activation of the overcurrent protection, malfunction of the fast-response current limit operation, or even
to an inverter failure. It may also cause a malfunction or fault of the equipment connected ON the inverter output side. If the
fast-response current limit function malfunctions, disable the function. (For the details of Pr.156 Stall prevention operation
selection, refer to the Instruction Manual (Function).)
• For the details of Pr.72 PWM frequency selection, refer to the Instruction Manual (Function).
• Refer to page 77
Bus bar dimensions (for each
Tightening
phase)
torque (N·m)
R, S, T
24.5 6 mm thick and 40 mm wide
Bus bar dimensions (for each phase)
Tightening
torque (N·m)
U, V, W
24.5 6 mm thick and 40 mm wide 6 mm thick and 60 mm wide 2×80
1000
500 m or less
to drive a 690 V class motor by an inverter.
Earth (ground) cable size
2 *1
PVC cables, etc. (mm )
2×80
Earth (ground) cable size
P, N PVC cables, etc. (mm
300 m
300 m
300 m + 300 m = 600 m
2. INSTALLATION AND WIRING
2.5 Main circuit terminals
1
2
3
2 *1
)
4
5
6
7
8
9
10
39