Littelfuse Selco B9300 Power Reference Unit User Manual
B9300 power reference unit, Power ref. unit, B9300
B9300 Power Reference Unit
POWER REF. UNIT
B9300
ON
10
0
• Setting of generator capacity via
SELCO load sharers
• Adjustable from 0 to 100%
• DC output (0 - 1V DC, ±1V DC,
0 - 3V DC or 0 - 5V DC)
• Knob for manual control
• Screw lock for knob
• 50 hours burn-in before test
• Ambient temperature range:
-20°C to +70°C
• Flush mounted unit
Application
The B9300 Power Reference Unit is
applied for setting the capacity to be
provided by the engine driven gene-
rator(s) when the generators are
operated in parallel with a grid (utility)
or a shaft generator.
The B9300 is used as a complementary
unit to SELCO’s range of load sharers
(Load Sharer type T4300, T4400 and
T4800).
Function
The load sharer will adjust the power of
an engine driven generator according to
the setting of the knob placed on the
front panel of the Power Reference
Unit. The setting is 0 - 10 (equivalent to
0 - 100 %).
A finger screw is provided for locking
the dial.
The same Power Reference Unit can
also be connected to several load
sharers where a multi engine installa-
tion is operating in parallel with a grid
supply.
The output of the B9300 Power
Reference Unit (terminals 5 and 3) is
connected to the parallel lines of the
load sharer(s) (terminals 12 and 13).
The connection of terminal 5 of the
B9300 Power Reference Unit and
terminal 13 on the SELCO T4800 Load
Sharer will disable the frequency
control function in the load sharer. This
is used when running parallel to the
grid (utility) or other frequency
determining power sources.
Please note that the dead band zone in
the T4800 Load Sharer will be reduced
to half of its original setting. If instability
occurs, the dead band zone should be
increased by increasing the STABILITY
setting on the T4800.
The B9300 Power Reference Unit is for
flush mounting and it has standard
instrument dimensions 96 x 96 x 80mm
(H x W x D).
Option
In order to obtain remote setting of the
power reference function, a combina-
tion of Selco’s E7800 Motorized Poten-
tiometer Type and B9300 Power
Reference Unit is available. The unit is
specified E7800-9x. For details, please
refer to the data sheet for the E7800
Motorized Potentiometer. This data
sheet can be downloaded from our web
site www.selco.com
Example of setting:
Generator rating: 695A at PF 0.8
Active current: 695 x 0.8 = 556A
Current transformer: 800/5
Maximum on dial: 10
Full load on dial: 10 x 556/800 = 6.95
(69.5%)
MAINS-SWITCH
POWER
REFERENCE
B9300-XX-14
LOAD SHARER
T4400
LOAD SHARER
T4400
BUS
GRID
MAINS-SWITCH
AUT./MAN.
POWER
REFERENCE
B9300-XX-10
MOTOR
SUPPLY
DECR.
INCR.
GEN.
1
LOAD SHARER
T4800
AUT./MAN.
LOAD SHARER
T4800
MOTOR
SUPPLY
DECR.
INCR.
GEN.
1
BUS
GRID
Fig. 1. Application Diagram. B9300 with T4400.
Fig. 2. Application Diagram. B9300 with T4800.