Digital Voltage Regulator Caterpillar

Electrical

Usage:

SR4B 1BN

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Table 1
Specifications
Regulation	0.25% from no load to full load
Regulator temperature drift	Less than 0.5% for any 40 °C (72 °F) change over the ambient operating temperature range.
Configurable Volts/Hz characteristic	Two slope ranges adjustable from 1 to 10 V/Hz. See the Regulation Characteristic Illustration.
Regulator response time	Maximum of 10 milliseconds.
Regulator sensing	True RMS 3-phase sensing is standard. Single phase sensing is available. Variable sense range: 90 to 600 volts.
Regulator stability	The regulator responds to the fundamental component of the sensed voltage and remains stable for total harmonic distortion of the generator output voltage waveform, up to 20%.
Telephone influence factor (TIF)	Less than 50. Complies with MIL STD 461C Part 9 and VDE 0875 level N.
Fine voltage adjust range	± 10% of regulator sensing voltage.
Regulator voltage gain (Line loss compensation)	Adjustable from 0 to 10%.
Fault detection and identification	Diagnostics identify operation outside of programmed limits. Specific fault information is available even after the unit has been powered down.
Regulator start-up voltage	Meets ISO8325-3 class G2 specifications.
Harmonic tolerance	The digital voltage regulator maintains precise control of the generator output with up to 20% harmonic distortion in the generator output voltage.
Reactive droop adjustment	Adjustable from 0 to 10%.
Overexcitation protection	Shuts off generator output when excitation current exceeds normal operating currents for 15 seconds or instantaneous shutoff if output is shorted.
Ambient operating temperature	−40 °C (−40 °F) to +70 °C (+ 158 °F).
Storage temperature range	−40 °C (−40 °F) to +85 °C (+ 185 °F).
Power dissipation	5 watts at idle, 55 watts at rated output.
Shock	Withstands up to 20 g's.
Vibration	Withstands 4.5 g's at frequencies between 18 and 2000 Hz in three mutually perpendicular planes.
Salt spray	Meets MIL-STD-810C, method 509.1.
Sealing	Withstands up to 35 kPa (5.08 psi).
Weight	5 kg (11 lb).
Electromagnetic compatibility	Meets 89/336/EEC Electromagnetic Compatibility Directive.
Power supply	24 ± 6 volt DC power supply required (0.5 amp).

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Illustration 1	g00538141
Regulation Characteristic Illustration

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Table 2
Summary of Operating Parameters For the 120 Volt PM and SE Generators
Power Input	V	70-120 3 Ø
	Freq. Hz	50-240
	VA	1500
Output Rating	Max. Continuous	V	48
	Max. Continuous	A	12
	Min. Forcing	V	84
	Min. Forcing	A	21
Sensing	V	79 to 124
Sensing	Max. VA Burden per Ø	1
Reactive Droop Input	Max. Voltage	5
Reactive Droop Input	Max. VA Burden	1
Exciter Field Resistance	Min. Ohms	3
Exciter Field Resistance	Max. Ohms	10

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Table 3
Summary of Operating Parameters For the 240 Volt PM and SE Generators
Power Input	V	70-120 3 Ø
	Freq. Hz	50-240
	VA	1500
Output Rating	Max. Continuous	V	48
	Max. Continuous	A	12
	Min. Forcing	V	84
	Min. Forcing	A	21
Sensing	V	125 to 249
Sensing	Max. VA Burden per Ø	1
Reactive Droop Input	Max. Voltage	5
Reactive Droop Input	Max. VA Burden	1
Exciter Field Resistance	Min. Ohms	3
Exciter Field Resistance	Max. Ohms	10

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Table 4
Summary of Operating Parameters For the 480 Volt PM and SE Generators
Power Input	V	70-120 3 Ø
	Freq. Hz	50 to 240
	VA	1500
Output Rating	Max. Continuous	V	48
	Max. Continuous	A	12
	Min. Forcing	V	84
	Min. Forcing	A	21
Sensing	V	250 to 600
Sensing	Max. VA Burden per Ø	1
Reactive Droop Input	Max. Voltage	5
Reactive Droop Input	Max. VA Burden	1
Exciter Field Resistance	Min. Ohms	3
Exciter Field Resistance	Max. Ohms	10