Rockwell Automation GV3000 AC Pwr Module Ver. 5.0 Hardware Ref, Installation, and Troubleshooting - Manual (Page 25)

2Ć9
2.7 Regulator Board Description
GV3000 drive regulation is performed by a microprocessor on the Regulator board. See figures 2.8
and 2.9. Drive operation is adjusted by the parameters entered through the keypad. The Regulator
board accepts power circuit feedback signals, an external speed reference signal, and internal heat
sensor feedback, as well as data from a pulse tachometer that is attached to the motor when set up
for vector regulation. The Regulator board provides:
D PWM gating signals to the IGBT power devices
Based on the output of the control loop, the regulator sends PWM gating signals through the
Current Feedback board to isolated drivers on the Gate Driver board. These drivers switch the
Insulated Gate BiĆpolar Transistors (IGBTs), producing a Pulse Width Modulated (PWM) waveform
that corresponds to the speed (vector regulation) or frequency (volts/hertz regulation) reference.
The IGBTs can be switched at either a 2, 4 or 8 kHz carrier frequency.
D Form A and B contacts for drive status indicators
The Form A and B contacts are under control of the user via programmable parameters. A Form A
or B transition can indicate drive status. The contacts are rated for 5 Amps resistive load at 250
VAC/ 30 VDC and are made available through the terminal strip.
D Display data for a fourĆcharacter display and fourteen indicator LEDs
The fourĆcharacter display is used to indicate drive parameters, parameter values, and fault
codes. The fourteen single LEDs indicate drive status and mode, as well as identifying drive
outputs whose values are displayed on the fourĆcharacter display.
D An analog output
The analog output is a scaled voltage (0Ć10 VDC) or current (4Ć20 mA) signal proportional to
either motor speed (RPM) or motor torque or current (%TORQUE). The current selection (via
jumper J17) requires a power supply for operation. The power can be sourced from the pulse
tachometer terminals (4 and 9) or from an external 15V power supply. See table 7.1, terminals 10
and 11, for more information. The analog output signal is available through the terminal strip.
D A snubber resistor braking signal
The 1Ć60 HP regulator provides a signal for use by an optional snubber resistor braking kit. The
signal goes through an isolating driver, made available through the terminal strip.
Two Regulator boards are used on the GV3000 drives: 1Ć60 HP Regulator boards are used with
1Ć60 HP drives; 60Ć150 HP Regulator boards are used with 60Ć150 HP drives. As shown in figures 2.8
and 2.9, the Regulator boards are similar but have different Power Module interface connectors.