Basler SR4A User Manual

4-1
The initial operating procedures are outlined in paragraph 4-6 through 4-7 and should be reviewed
before operation is attempted.
Prolonged operation at speeds lower than normal can damage the voltage regulator and/or exciter
and generator field. If operation at reduced speed is essential, input power should be removed from
the regulator or an underfrequency overvoltage protection module (UFOV Module) should be added
to the system.
a. The regulator may be equipped with a switch to allow removal of excitation from the field in an
emergency or when the generator prime mover must be operated at reduced speed. (See Figure
3-3.) If this switch is not used, it is recommended it be temporarily installed for initial operation.
b. If the A- terminal is used, a double pole switch must be used for voltage shut down.
SECTION 4
OPERATION
4-1. GENERAL
WARNING
All SR4A and SR8A Voltage Regulators are shipped factory
preset for 120 Vac sensing.
4-2. OPERATION AT REDUCED SPEEDS
CAUTION
Do not operate the generating system at reduced speeds for an
extended period of time with the voltage regulator in operation.
4-3. VOLTAGE SHUTDOWN
CAUTION
When used, this switch must always be installed in the input power line to
the regulator (terminal 3 or 4). A high flyback voltage could develop and
damage the regulator and/or the exciter field if this switch is installed in
the dc field circuit (terminal F+ or F-).

Basler SR4A Specifications

General

Brand	Basler
Model	SR4A
Category	Controller
Language	English