1-1
a. The SR4A and SR8A Voltage Regulators precisely control the output voltage of an ac electric
generating system by controlling the amount of current supplied to the exciter (or generator) field.
This includes brushless rotary exciters, brush type rotary exciters or direct excitation into the
generator field of machines within the regulator's power rating.
b. The regulators consist of silicon controlled rectifiers (SCR's) transistors, transformers, silicon
diodes, resistors and capacitors. The voltage regulators contain no electrolytic capacitors and are
relatively unaffected by temperature, humidity, vibration and shock.
Table 1-1 provides the electrical specifications of the SR4A and SR8A while Table 1-2 provides the
physical specifications.
Table 1-1. Electrical Specifications.
Input Power:
SR4A:
SR8A:
95 - 139 Vac (±10), 50/60 Hz, 840 VA.
190 - 277 Vac (±10), 50/60 Hz, 1680 VA.
Output Power:
SR4A:
SR8A:
63 Vdc @ 7 A Maximum Continuous, 90 Vdc @ 10 A One Minute
Forcing.
125 Vdc @ 7 A Maximum Continuous, 180 Vdc @ 10 A One
Minute Forcing.
Input Sensing:
SR4A:
SR8A:
NEMA Standard 60 Hz: 100 - 110/190 - 200 - 208/220 - 230 -
240/380 - 400 - 415/500 Vac; ±10%.
NEMA Standard 60 Hz: 120 - 139/208/240/416/480/600 Vac;
±10%.
Input Sensing Burden:
SR4A:
SR8A:
10 VA.
10 VA.
Parallel Compensation:
5 A Input; 25 VA Burden. Droop adjust to 6%.
Minimum Field Resis-
tance:
SR4A:
SR8A:
9
Ω
18
Ω
Voltage Regulation:
<±1/2% (Average voltage).
SECTION 1
GENERAL INFORMATION
1-1. DESCRIPTION
1-2. SPECIFICATIONS
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