Connecting The Main Circuit And Ground Terminals - GE AF-300 P11 User Manual

2.3.2 Connecting the Main Circuit and Ground Terminals

Table 2.3.1 Functions of main circuit terminals and ground termnals
Symbol Terminal Name
L1/R,L2/S,L3/T Main circuit power terminals
U,V,W Inverter output terminals
R0,T0 Input terminals for auxiliary control power
P1,P(+) DC reactor terminals
P(+),DB Terminals for external braking resistor
P(+),N(-) Terminals for DC link circuit
G Ground terminal
(1) Main circuit power terminals (L1/R, L2/S, L3/T)
1. Connect these terminals to the power supply via a molded-case circuit breaker or ground-leakage circuit breaker for
circuit protection. Phase-sequence matching is unnecessary.
2. To insure safety, a magnetic contactor should be used to disconnect the drive from the power supply when the drive
protective function activates.
3. Use control circuit terminal FWD/REV or the RUN/STOP key on the keypad panel to start or stop the drive. The main
circuit power should be used to start or stop the drive only if absolutely necessary and then should not be used
more than once every hour.
4. If you need to connect these terminals to a single-phase power supply, please contact the factory.
(2) Drive output terminals (U, V, W)
1. Connect these terminals to a 3-phase motor in the correct phase sequence. If the direction of motor rotation is
incorrect, exchange any two of the U, V, and W phases.
2. Do not connect a power factor correction capacitor or surge absorber to the drive output.
3. If the cable from the drive to the motor is very long, a high-frequency current may be generated by stray capacitance
between the cables and result in an overcurrent trip of the drive, an increase in leakage current, or a reduction in
current indication precision.
When a motor is driven by a PWM-type drive, the motor terminals may be subject to surge voltage generated by drive
element switching. If the motor cable (with 460V series motors, in particular) is particularly long, surge voltage will
deteriorate motor insulation. To prevent this, use the following guidelines:
Drives 7.5 HP and larger
Motor Insulation Level
460 VAC Input Voltage
230 VAC Input Voltage
Drives 5 HP and smaller
Motor Insulation Level
460 VAC Input Voltage
230 VAC Input Voltage
* For this case the cable length is determined by secondary effects and not voltage spiking.
Note: When a motor protective thermal O/L relay is inserted between the drive and the motor, the thermal O/L relay may
malfunction (particularly in the 460V series), even when the cable length is 165 feet (50m) or less. T o correct, insert a
filter or reduce the carrier frequency. (Use function code "F26 Motor sound".)
Description
Connects a 3-phase power supply
Connects a 3-phase motor
Connects a backup AC power supply to the control
circuit (not supported for drives of 1 Hp or less)
Connects the optional power correcting DC reactor
Connects the optional external braking resistor (for
drives of 15 Hp or less)
Supplies DC link circuit voltage to the external
braking unit (option) or power regeneration unit
(option).
Connects the drive chassis (case) to ground.
1000V 1300V
66 ft (20 m) 328 ft (100 m)
1312 ft (400 m) * 1312 ft (400 m) *
1000V 1300V
66 ft (20 m) 165 ft (50 m) *
328 ft (100 m) * 328 ft (100 m) *
2-8
1600V
1312 ft (400 m) *
1312 ft (400 m) *
1600V
165 ft (50 m) *
328 ft (100 m) *
Data subject to change without notice 7/07. © 2007 GE Drives