Basler VR63-4C/UL Analog Excitation Voltage Regulator

Core electrical technical parameters

1. Excitation DC output capability

Long term continuous: 4A/63V, 252W;

1-minute forced excitation: 7A/100V, 700W (input 120Vac working condition);

Suitable excitation winding DC resistance: 15 Ω~100 Ω, use is prohibited below 15 Ω.

2 AC power supply/sampling circuit

Single phase input sampling integrated (shared terminals 3 and 4), working range 85~139Vac, 50/60Hz ± 5%, capacity 450VA;

Voltage regulation range: 85~139Vac;

Voltage regulation accuracy: from no load to full load ＜ ± 1%;

Response speed: less than 1.5 cycles under sampling voltage ± 5% disturbance;

The maximum power consumption of the whole machine is 12W, with built-in EMI electromagnetic filter.

3 Environmental and mechanical indicators

Anti vibration: 5~26Hz 1.2G; 27~52Hz 0.036 inch dual amplitude; 53~1000Hz 5G；

Impact resistance: three-axis 20G;

Net weight 283g (10 ounces), can be installed at any angle.

Built in two core protections/functions

1. Frequency compensation (V/Hz low frequency limit)

Function: Suppress voltage rise when the unit slows down, improve sudden load performance, and avoid low-frequency overcurrent.

Factory default 50Hz inflection point 45Hz;

The 60Hz unit only needs to cut off the external HZ jumper, switch the inflection point to 55Hz, and cut off the wire end to ensure insulation;

The matching frequency compensation characteristic curve shows that the voltage decreases linearly with frequency.

2 Overexcitation shutdown protection

When the excitation DC exceeds the limit, the excitation output is cut off with a delay that is inversely proportional to the amplitude of the overvoltage

95V ± 5V range: inverse time delay, the higher the voltage, the faster the trip;

If it exceeds 140V ± 5V, immediately cut off the excitation within 0.2 seconds;

Reset method: Reduce the input voltage to below 6Vac, stop the prime mover or disconnect the power supply of the voltage regulator for at least 2 seconds to automatically reset.

4 residual voltage excitation

Built in solid-state excitation circuit, the generator can independently build voltage with only 6Vac residual voltage; When the residual voltage is insufficient, an external DC excitation is required.

Installation and wiring specifications

1. Installation opening

Provide two types of hole sizes (label facing up/down installation direction), reserve two Φ 9.8 installation holes, and provide the overall dimensions drawing of the machine.

2 4 standard wiring schemes

Covering different generator wiring forms:

Three phase four wire 208/240Vac unit;

Single phase 120/240Vac with neutral;

Three phase three wire 240Vac unit;

Single phase 120Vac without neutral;

Key wiring points

F+and F - strictly correspond to the positive and negative poles of the excitation machine winding;

The input front-end must be equipped with a 250V 5A high breaking fuse;

Sampling and power supply shared terminals 3 and 4;

Remote voltage regulation modification: Cut off the onboard VAR jumper and connect an external 1k Ω 1/2W potentiometer.

Adjustable knob on the panel

Two straight screwdriver adjustment potentiometers for the whole machine:

VOL voltage regulation: clockwise boost; Can replace external remote potentiometer;

STAB stable adjustment: clockwise → damping increases, overshoot decreases, response slows down; Counter clockwise → fast response and large voltage fluctuations.

Complete operational process

1. Preparation before startup

Verify the excitation winding resistance of 15-100 Ω;

Check all wiring and fuses;

The local voltage knob is completely counterclockwise (lowest), and the remote potentiometer is adjusted to the middle.

Unit 2 startup

Raise the rated speed and rely on residual voltage to independently build pressure;

Slowly adjust the voltage clockwise to the rated value;

Stability of load observation, coupled with the use of the TAB knob to eliminate oscillations.

3. Insufficient residual voltage excitation operation (Field Flashing)

When the unit is stationary, connect a 3-5 Ω current limiting resistor in series with a ≤ 12V DC power supply, and connect F+/F - for a short period of time (3 seconds); After starting, test the voltage of terminals 3 and 4 to be ≥ 6Vac to establish normal voltage. If it fails multiple times, it is determined that the AVR is damaged.

Offline bench testing method

120Vac 50/60Hz power supply, incandescent lamp simulated excitation load;

Turn the voltage knob counterclockwise to turn on the power, and the light bulb will flash briefly;

Slowly adjust clockwise, the brightness of the bulb changes smoothly, and a small adjustment at the critical point can turn on and off the bulb, indicating that the voltage regulation function is normal.

Optional accessories

Bath original factory locked remote voltage regulator potentiometer, part number 17727.