Operation; Operation At Reduced Speeds; Voltage Shutdown; Adjustments - Basler SR6A Instruction Manual

Operation

Initial operating procedures are outlined in Initial Operation and Field Flashing and should be reviewed
before operation is attempted.

Operation at Reduced Speeds

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 (UFOV) Module should be added to the system.

Voltage Shutdown

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. If this switch is not used, it is
recommended that it be temporarily installed for initial operation.
If the A– terminal is used, a double-pole switch must be used for voltage shutdown.

Adjustments

Adjustments pertaining to the regulator and system operation are described in the following paragraphs.
These adjustments are made during initial operation and normally do not have to be repeated during the
life of the unit.
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All SR6A & SR9A voltage regulators are shipped preset for 120 Vac
sensing.
Do not operate the generating system at reduced speeds for an
extended period of time with the voltage regulator in operation.
When used, this switch must always be installed in the input power
line to the regulator (terminal 3 or 4).
Do not install this switch in the dc field circuit (terminal F+ or F–). A
high fly-back voltage could develop and damage the regulator and/or
the exciter field.
To avoid high voltage arcing, the field circuit must never be opened
during operation. Also, a shutdown circuit using field discharge
resistors in the exciter field circuit should not be used. Safe shutdown
can be accomplished by interrupting regulator ac power to regulator
terminals 3 and 4.
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