GE ASTAT XT QT 0008U Series, User Manual

Page: 71 / 123

71
• Application diagrams
8.17
D.Set: Generator Parameters Wiring
Notes :
•
When starting from a diesel generator make sure that its size is suitable.
Based on experience, the power (kW) of a diesel generator should usually exceed at least 1.8 times the
power (kW) of the motor in order to enable consistent motor starts, consult the factory if necessary.
However this should be checked on a case by case basis.
• When starting from a diesel generator, its voltage regulator (especially older type regulators) may be
affected during the starting process, thus causing rapid voltage fluctuations (~350V to ~500V in 400V
systems). In these rare cases, the voltage regulator must be upgraded – consult your diesel generator
supplier.
• When operating from mains and alternatively from a diesel generator, set normal starting
characteristics for mains and suitable parameters for the diesel generator in the
DUAL Settings
Parameters
settings. When starting from mains, the primary settings (suitable for main starting) will
be operative. Upon starting from a diesel generator, close the contact between the Control Supply and
terminal 8 to operate in
D.Set: Generator Parameters
mode.
• To operate D.Set: Generator Parameters mode:
o
Set dip switch # 3 and dip switch #1 to ON - refer to sections 5.5.1 page 49 & 5.5.3, page 50.
o
Insert a contact (or jumper) between Control Supply and input terminal 8 (DUAL ADJUST) and
close contact to operate the
D.Set: Generator Parameters
. DUAL set LED will light.
o
Set the
D.Set: Generator Parameters
to the values necessary for the application (e.g.,
shorter
Ramp UP-2
, lower
Current Limit-2
, etc.). Refer to section
4.7.5 page 36 for
parameters settings.
Note:
The
D.Set: Generator Parameters
must not always be used when a diesel generator is supplying
the ASTAT-XT. Only use
D.Set: Generator Parameters
when the normal starting process fails, i.e.
Shorted Scr
or
Wrong Connection
faults occur, and only after you have tested and are sure that
the SCRs, motor and motor connections are not faulty.
When operating in
D.Set: Generator Parameters
, the motor must be loaded
to avoid vibration during starting and stopping.
WARNINGS
It is recommended to disconnect the power factor capacitors when operating with a
diesel generator.