AS440 | Generic Replacement for Cummins AS440 Automatic Voltage Regulator

PMI AS440 Automatic Voltage Regulator

Power Master

AS440 Generic Replacement for Cummins AS440 Automatic Voltage Regulator. Voltage Jumper selectable: 100-130 Vac 1 phase or 190-264 Vac 1 phase

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POWER INPUT

100 - 264 V AC 1 Phase

OUTPUT

82 V d.c - 200 V AC

WEIGHT

0.7 POUNDS

SIZE

7 x 4 x 3 Inches

REGULATION

+/- 1.0%

Key features
Description

FREQUENCY

50-60 Hz nominal

THERMAL DRIFT

0.03% per deg. C change in AVR ambient

BUILD UP VOLTAGE

4 Volts - AVR terminals

Sesing Input - 100-130 Vac 1 phase / 190-264 Vac 1 phase
Frequency - 50-60 Hz nominal
Power Input - 100-264 V ac 1 phase
Output -82 V d.c.@ 200 V a.c. ◖Current: continuous 4A, ◖lntermittent: 6A for 10 secs
Resistance - 15 ohms mínimum
Regulation - +/- 1.0%
Thermal Drift - 0.03% per deg. C change in AVR ambient
Typical System Response - AVR response 20ms / Filed current to 90% 80 ms / Machina Volts to 97% 300 ms
External Voltage Adjustment - +/-10% with 1k ohm 1 watt trimmer / lncreasing resistance lowers voltage

Under Frequency Protection - Set point 94 -98% Hz
Unit Power Dissipation - 12 watts maximum
Build Up Voltage - 4 Volts - AVR terminals
Analogue Input - ◖Maximum input: +/- 5 Vdc ◖Sensitivity: 1V fer 5% Generator Volts ◖Input resistance: 1k ohm
Quadrature Droop Input - 10 ohms burden ◖Max. sensitivity: 0.07 A far 5% droop 0PF ◖Max. input: 0.33 A
Over Excitation Protection - Set point 65 V dc ◖ Time delay 10-15 seconds
Environmental - ◖Vibration: 20-100 Hz 50mm / sec - 100Hz-2kHz 3.3g ◖Operating temperature: -40 to +70C ◖Relative Humidity 0-70C : 95% ◖Storage temperatura: -55 to +80 °C

AS440 is a half-wave phase controlled thyristor type voltage Regulator (AVR) and forms part of the excitation system for a

brush-less generator.

STABILITY ADJUSTMENT

The AVR includes a stability or damping circuit to provide good steady state and transient performance of the generator. A switch is provided to change the response of the stability circuit to suit different frame size generators and applications. The table shows the options available. The slow response settings may prove helpful in reducing lamp flicker. The correct setting of the Stability adjustment can be found by running the generator at no load and slowly turning the stability control anti-clockwise until the generator voltage starts to become unstable. The optimum or critically damped position is slightly clockwise from this point (i.e. where the machine volts are stable but close to the unstable region).

TRIM ADJUSTMENT

An analogue input (A1 A2) is provided to connect to a Power Factor Controller or other devices. It is designed to accept dc signals up to +/- 5 volts. WARNING! Any devices connected to this input must be fully floating and galvanically isolated from ground, with an insulation capability of 500 Vac. Failure to observe this could result in equipment damage. The dc signal applied to this input adds to the AVR sensing circuit. A1 is connected to the AVR 0 volts. Positive on A2 increases excitation. Negative on A2 decreases excitation. The TRIM control allows the user to adjust the sensitivity of the input. With TRIM fully anti-clockwise the externally applied signal has no effect. Clockwise it has maximum effect. Normal setting is fully clockwise when used with a Power Factor Controller.

DROOP ADJUSTMENT

Generators intended for parallel operation are fitted with a quadrature droop C.T. which provides a power factor dependent signal for the AVR. The C.T. is connected to S1, S2 on the AVR. The DROOP adjustment is normally preset in the works to give 5% voltage droop at full load zero power factor. Clockwise increases the amount of C.T. signal injected into the AVR and increases the droop with lagging power factor (cos Ø). With the control fully anti-clockwise there is no droop.

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