Avtron K711/K711A/K711L
Resistive Load Bank - 5 to 1250 KW
Testing Your Emergency Standby
Generator with a Load Bank Means
Reliability When it Matters Most.
Key Features
•Economical - Uses Engine Air
for Cooling
•Reduces “Wet-Stacking” Problems
•Provides Load for Routine
Generator Testing
•Corrosion Resistant Aluminized
Steel Frame
•Includes Lifting Eyes and Duct
Flange for Easy Installation
Superior Avtron quality combined with
simple operation and maintenance will
provide years of trouble free service.
Avtron’s extensive line of Load Bank and
Industrial Resis­tor Products are solid
performers used throughout the world.
The Avtron Model K711 Load Bank are intended for use as
a supplemental load for lightly loaded engine gen sets.
The Avtron K711/K711A/K711L load banks are designed for duct or radiator mounting and
are available in a variety of frame dimensions. The load banks are permanently mounted to
the front of the engine generator and sized to match the radiator or exhaust duct opening.
The K711 load banks utilize the engine cooling air rather than an internal cooling fan found
on conventional load banks.
The primary cause of premature diesel engine failure is “wet-stack­ing” which is literally
“wet” unburned fuel accumulating in the engine exhaust (“stack”), due to under-loading of
the generator. Diesel engines that are lightly loaded or allowed to idle for long periods never
reach their recommended full operating temperature. Over time, this unburned fuel coats
the combustion chamber and pistons with a thick coating of tar and carbon build-up, reducing
efficiency and life span of the engine considerably. A supplemental radiator load bank helps to
“burn-off” these harmful carbon deposits, greatly increasing engine life.
These units are offered in 208, 240, 480 or 600 volt versions (at 60 Hz) or 380, 400 or 416
volt versions (at 50 Hz). Load rating varies and ranges between 5 and 1250 KW. Most engine
manufacturers recommend sizing the radiator load bank to 40-60% of engine nameplate
rating to eliminate “wet-stacking” problems.
The K711 load bank is controlled from a built-in control panel which contains the individual
load-step toggle switches. The control panel is also available sized for standard 19" [482.6]
rack mounting when remote installation of the panel is desired.
The K711 family is intended for use as a supplemental load for lightly loaded engine generator sets.
The load bank utilizes the engine cooling air to cool the resistive load elements.
For total technical support or additional
information, please contact Avtron at
(216) 573-7600 or LBsales@Emerson.com.
Quality System Certified to ISO 9001
K711 500 KW Resistive
Radiator Mount Avtron
Load Bank.
Avtron K711
Resistive Load Bank - 5 to 1250 KW
Specifications subject to change without notice.
Construction
Formed aluminized steel frame provides a rigid
enclosure to match the height and width of
the engine radiator or duct. Lifting eyes and a
radiator duct flange are included to simplify
installation. The standard K711 depth is 13"
[330.2]. For applications where the amount of
load element KW required exceeds the available 13" depth, then a “double-deep” K711A
can be used instead, with a 26" [660.4] depth.
Designed for NEMA-1 indoor installation,
the K711/K711A is also available in NEMA3R outdoor construction as an option. The
K711L frame can be used for special mounting of 1250 KW load banks to high capacity
2000/2500 KW generator sets.
Options
4.00 [101.60]
•Control Power Transformer
•Outdoor Construction with Bolt-on Louver
Assembly
RECOMMENDED
CONDUIT
ENTRY AREA
NOTE Designs for international 50/60 Hz voltages are also
available. Consult factory.
SEE DETAIL "B" (above)
CONTROL PANEL
(ALTERNATE
LOCATION)
30°
BOLT-ON
DUCT
ADAPTER *
CONTROL PANEL
(STANDARD
LOCATION)
OUTDOOR
LOUVER
(OPTIONAL)
A
W=
(RADIATOR
CORE
WIDTH)
H + 4.00
[101.60]
H_ _ _
DIRECTION OF
ELEMENTS
C
SEE DETAIL "A"
(above)
13.00
[330.20]
POWER
POWER DISTRIBUTION BLOCK DISTRIBUTION
BLOCK
SUPPORT BRACKET
K711L
B
H=
(RADIATOR
CORE
HEIGHT)
BUS BAR
CONNECTIONS
26.00
[660.40]
6.00
[152.40]
2.00 TYP
[50.80]
W_ _ _ REF
CONTROL POWER
CONNECTIONS
K711
K711A
W + 20.00
[508.00]
2.00 [50.80]
* NOTE:
IF DUCT ADAPTER IS USED, MOUNT USING LEFT & RIGHT FLANGES ONLY.
OTHERWISE USE TOP AND BOTTOM FLANGES OF THE LOAD BANK.
7.50
[190.50]
DETAIL "A"- K711L
W + 24.00
[609.60]
W_ _ _
2.00
REF
[50.80]
W_ _ _
5.50
[139.70]
0.62 [15.75]
0.563 DIA
[14.30]
8 HOLES
2.00
[50.80]
LOAD CONNECTION BUS BAR
1.75
[44.45]
H + 4.00
[101.60]
H=
(RADIATOR
CORE
HEIGHT)
H_ _ _
W=
(RADIATOR
CORE
WIDTH)
(SCALE 2:1)
5.50 [139.70]
A
C
Resistor Elements
B
13.00
[330.20]
C
42.00
[1066.80]
RADIATOR
(CUSTOMER SUPPLIED)
AIRFLOW
2.00 REF
[50.80]
Emerson Network Power
Avtron • 6255 Halle Drive, Cleveland, Ohio 44125, U.S.A.
216-573-7600 • FAX: 216-573-5953 • LBsales@Emerson.com
EmersonNetworkPower.com/loadbank
DUCT ADAPTER
FLANGE REF
AIRFLOW
•Remote I/O for Interface with Switch Gear
CONTROL
PANEL
The fully supported Avtron Helidyne™ resistive
load elements are made of corrosion resistant
chromium alloy wire and are engineered to
operate at conservative temperature ratings.
This provides more stable loading, extends resistance element operating life, and eliminates
the need for a cool down period after load bank
operation.
DETAIL "B"
OUTDOOR LOUVER REF
•Remote Control Panel with Enclosure
Cooling
The local control panel contains a POWER ON
-OFF switch, a MASTER LOAD ON-OFF switch,
and individual load step toggle switches for application of individual load sections. A MANUAL/
AUTO switch is also provided (if the optional
automatic load step controller is included). A
remote rack-mounted control panel with wallmounted enclosure is available as an option.
1.00
[25.40]
1.00
[25.40]
0.500 DIA
[12.70]
4 HOLES
DETAIL "A"
•ADMS™ Digital Metering System, Remote
Mounted
The K711/K711A/K711L requires exter­nal
control power of 120 VAC, single phase,
50/60 Hz. A control power transformer is
available as an option for sites where 120
VAC is not readily available.
Controls
1.75
[44.45]
•Automatic Load Step Controller
Control Power
The K711/K711A/K711L does not have its
own cooling system. Instead, it relies on
cooling air from the engine driven radiator
fan or separately powered duct blowers. A
built-in thermal switch drops all load if an
overtemperature condition is detected.
LIFTING HOLES
1.00 DIA [25.40]
TYP 4 PLACES
3.75
[95.25]
5.00
[127.00]
LOAD CONNECTION
BUS BARS
12.13 [308.10]
4.00
[101.60]
SEE DETAIL "A"- K711L
All dimensions are in inches [millimeters].
Emerson. Consider it Solved and Emerson Network Power are trademarks of Emerson Electric Co.
or one of its affiliated companies. All the other marks are the property of their respective owners.
ADMS™ and Helidyne™ are trademarks of Avtron. Specifications subject to change without notice.
©2015 Emerson Network Power Bulletin 263A• Rev. J