Simplex, Inc., 5300 Rising Moon Road, Spring
fi
eld, IL 62711-6228 • 217-483-1600 • Fax 217-483-1616
Lbdman8p.indd (04/11) • © 2011 Simplex, Inc. All Rights Reserved. • Printed in the USA. • www.simplexdirect.com
LOAD BANK MANUAL • LBD Series • page 5 of 16
OPERATION
1. Start-up generator or bring other test
source on line.
2. Adjust power source voltage and
frequency.
3. Place the “Control Power” switch in
the “On” position or press the “On”
pushbutton.
4. Verify the illumination of the “Normal
Operation” lamp before proceeding.
MANUAL
5. Select the desired load steps by
placing them in the “On” position.
LBD Load Banks equipped with only
Manual Control have two-position
load step switches: “On” and “Off”.
LBD Load Banks equipped with
Manual and Automatic Control have
three-position load step switches:
“Auto”, “Off” and “Manual” – or – a
Mode Selector switch with the fol-
lowing positions: “Auto”, “Off”, and
“Manual”; and load step switches
with “On” and “Off” positions.
6. Place the “Master Load” switch, if
equipped, in the “On” position.
This simultaneously applies all of
the load steps which are in the “On”
position.
Trim is achieved by
fl
ipping the load
steps “On” and “Off” while the “Master
Load” is in the “On” position.
7. Adjust source voltage and load.
Monitor as needed.
AUTOMATIC
Place all of the load step switches in
the “Auto” position, or the Mode Se-
lector Switch in the “Auto” position. In
Automatic Mode, the Current Sensing
Relays and Time Delay Relays (CSRs
and TDRs), or a Programmable Logic
Controller (PLC) in conjunction with
(2) CSRs, automatically apply load as
needed. These devices are factory set
to maintain a minimum net load on the
generator equal to approximately 60%
of the generator’s full load capability.
Time delays between applying load
steps are adjustable; see the speci
fi
c
prints supplied for your Load Bank.
CSR and TDR Example
60kW Load Bank with (3) 20kW Load
Steps Serving a 100kW Generator:
While normal load (building load) is ap-
proximately 50kW or greater, the Load
Bank will remain off-line, and add no
load onto the generator.
When normal load drops below 50kW,
the Load Bank will apply load step #1
(20kW) to the generator following a
time delay determined by the setting
of TDR1.
Never operate or service a Load
Bank that is not properly con-
nected to an earthground.
