Regulator Board Description - Reliance electric GV3000 Instruction Manual

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:
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 Bi polar 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.
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.
Display data for a four character display and fourteen indicator LEDs
The four character 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 four character display.
An analog output
The analog output is a scaled voltage (0 10 VDC) or current (4 20 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.
A snubber resistor braking signal
The 1 60 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: 1 60 HP Regulator boards are used with
1 60 HP drives; 60 150 HP Regulator boards are used with 60 150 HP drives. As shown in figures 2.8
and 2.9, the Regulator boards are similar but have different Power Module interface connectors.
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