Regulator Board Description - Reliance electric GV3000/SE Installation Manual

2.4 Regulator Board Description

About the Drive
GV3000/SE drive regulation is performed by a microprocessor on the Regulator
board. See figure 2.4. Drive operation is adjusted by the parameters entered
through the keypad. The Regulator board accepts power circuit feedback signals
and an external speed reference signal, as well as data from an encoder that is
attached to the motor when set up for FVC 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 (FVC 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 signal selection (via jumper J17) requires a power supply for
operation. The power can be sourced from the encoder terminals (4 and 9) or
from an external 15V power supply. See table 7.8, terminals 10 and 11, for
more information. The analog output signal is available through the terminal
strip.
• A snubber resistor braking signal
The Regulator board provides a signal for use by an optional snubber resistor
braking kit. The signal is available through the terminal strip.
2-5