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2.8 Regulator Board Description
Drive regulation is performed by a microprocessor on the Regulator board. See
figures 2.9, 2.10, and 2.11. 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:
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Three Regulator boards are used on the GV3000/SE drives:
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As shown in figures 2.9, 2.10, and 2.11, the Regulator boards are similar but have
different Power Module interface connectors.
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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
PWM waveform that corresponds to the speed (FVC regulation) or frequency (V/Hz
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
For a description of the keypad/display, refer to section 2.8.6. For operational
instructions, see the GV3000/SE software reference manual (D2-3359).
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 tables 7.3 and 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 1-60 HP Regulator board provides a signal for use by an optional snubber
resistor braking kit for 1-10 HP drives. The signal is available through the terminal
strip.
1-60 HP Regulator boards are used with 1-60 HP drives (M/N 1V4XXX to
60G4XXX)
60-150 HP Regulator boards are used with 60-150 HP drives (M/N 75R4XXX to
125R4XXX)
200-400 HP Regulator boards are used with 200-400 HP drives (M/N 200V4XXX to
400V4XXX).
2-11
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