YASKAWA GA800 Series, Technical Reference

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3.3 Main Circuit Wiring
82 YASKAWA SIEPC71061737B GA800 Drive Technical Reference
Model Terminal
Recommended
Gauge
AWG, kcmil
Applicable Gauge
(IP20 Applicable
Gauge *1 )
AWG, kcmil
Wire Stripping
Length
*2
mm
Terminal Screw
Tightening Torque
N ∙ m (in ∙ lb)
Size Shape
4720
R/L1, S/L2, T/L3 300 × 4P
2/0 - 300 × 4P
(250 - 300 × 4P)
- M12 Hex self-locking nut
35
(310)
U/T1, V/T2, W/T3 300 × 4P
2/0 - 300 × 4P
(250 - 300 × 4P)
- M12 Hex self-locking nut
35
(310)
-, +1 400 × 4P
3/0 - 400 × 4P
(300 - 400 × 4P)
- M12 Hex self-locking nut
35
(310)
+3 4/0 × 4P
2 - 4/0 × 4P
(4/0 × 4P)
- M12 Hex self-locking nut
35
(310)
2/0
2/0 - 300
(-)
- M12 Hex bolt (slotted)
32 - 40
(283 - 354)
*1 For IP20 protection, use wires that are in the range of applicable gauges.
*2 Remove insulation from the ends of wires to expose the length of wire shown.
*3 For wire gauges more than AWG 8, tighten to a tightening torque of 4.1 N∙m to 4.5 N∙m (36 in∙lb to 40 in∙lb).
*4 Terminals - and +1 have two screws. The Recommended Gauge is the wire gauge for one terminal.
*5 A junction terminal is necessary to connect a braking resistor unit (LKEB-series) to terminals B1 and B2.
◆
Main Circuit Terminal and Motor Wiring
This section outlines the various steps, precautions, and checkpoints for wiring the main circuit terminals and motor
terminals.
WARNING! Fire Hazard. Do not connect main power supply wiring to drive motor terminals U/T1, V/T2, and W/T3. Connect main
power supply wiring to main circuit input terminals R/L1, S/L2, and T/L3. Incorrect wiring can cause serious injury or death from fire.
WARNING! Sudden Movement Hazard. Make sure that you align the phase order for the drive and motor when you connect the
motor to drive output terminals U/T1, V/T2, and W/T3. If the phase order is incorrect, it can cause the motor to run in reverse. If the
motor accidentally runs in reverse, it can cause serious injury or death.
NOTICE: Do not connect phase-advancing capacitors, LC/RC noise filters, or leakage breakers (GFCI) to the motor circuit. If you
connect these devices to the output circuits, it can cause damage to the drive and connected equipment.
■
Cable Length Between Drive and Motor
When the wiring between the drive and the motor is too long, voltage drop along the motor cable can decrease motor
torque, usually at low frequency output. If you connect motors in parallel with long motor cable, this is also a
problem. Drive output current increases when the leakage current from the cable increases. An increase in leakage
current can cause overcurrent and decrease the precision of the current detection.
Use the values in L8-27: Overcurrent Detection Gain on page 944 to adjust the drive carrier frequency. When the
system configuration makes the motor wiring distance more than 100 m (328 ft), do not use metal conduits or use
isolated cables for each phase to decrease stray capacitance.
Table 3.3 Carrier Frequency against Cable Length Between Drive and Motor
Wiring distance between the drive
and motor
50 m (164 ft) maximum 100 m (328 ft) maximum More than 100 m (328 ft)
Carrier Frequency 15 kHz or less 5 kHz or less 2 kHz or less
Note:
• To set the carrier frequency in a drive that is operating more than one motor, calculate the cable length as the total distance of wiring to all
connected motors.
• IN OLV/PM and AOLV/PM [ A1-02 = 5 and 6 ], the maximum cable length is 100 m (328 ft).
•
When you connect to a PM motor, it can be necessary to adjust the overcurrent detection. For details, refer to L8-27: Overcurrent Detection
Gain on page 944 .
■
Ground Wiring
Follow the precautions to wire the ground for one drive or a series of drives.