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 3 of 16
This Load Bank is protected against
cooling failures (high exhaust air tem-
perature which could damage the Load
Bank or present a safety hazard to the
operator). The “Normal Operation”
lamp illuminates when Control Power is
available and the Cooling System is op-
erating properly. When a cooling failure
occurs the automatic safety features in
the Control System immediately remove
the load from the test source and illu-
minates the “Over Temperature” lamp.
The malfunction must be corrected and
the Load Bank must be reset by turning
the Load Bank “Off” then “On” before
the load can be re-applied.
The Load Bank consists of two principal
systems:
1. Control System
2. Load System
CONTROL SYSTEM
The Control System allows the opera-
tor to apply a desired load to the test
source and measure the response of
the test source to the load. This system
also contains the circuitry utilized to
disconnect the Load Bank from the test
source in the event of cooling failures
and/or improperly positioned operating
controls. The Control System consists
of switches and lamps located on the
Control Panel and logic circuitry located
in the Control Section.
Control power (120V) is supplied to
the Load Bank by one of the following
methods:
1. test source via a control power trans-
former,
2. test source line to neutral, or
3. external source.
LOAD SYSTEM
Simplex LBD Series Load Banks are
built up in fused branch circuits of not
more than 70A each and protected by
600V, 200,000AIC class-T fuses. All
wiring and devices within the branch
circuit are rated in accordance with the
fuse rating. Branch circuit fusing of the
elements virtually eliminates the danger
of short circuit of the load elements and
consequent catastrophic damage to the
Load Bank.
These Load Banks utilize either the
Simplex Pow'r Rod or the Simplex Pow'r
Web load elements. See Parts Legend
Drawing for speci
fi
c elements used.
Pow'r Rod Load Elements
Simlpex Pow'r Rod Load Elements are
UL recognized. These elements are
totally enclosed, sealed and weath-
erproof. Pow'r Rod elements consist
of nickel-chromium resistance wire
electrically insulated and sealed within
a metallic sheath. The hazard of electric
shock to personnel and the danger of
short circuit by foreign object penetra-
tion are reduced since the elements are
electrically dead on the outside. They
will not fatigue from engine or air-blast
vibrations and will not sag or stretch
if overheated. The sheath material is
"incolloy", a rustproof nickel alloy with a
very high temperature rating (1600°F).
These elements do not require a cool
down period.
References to Automatic Op-
eration in this manual should be
ignored if the Load Bank you are
using is equipped with Manual
Load Step Application only.
