LZ design FES Discharger 2 User manual

FES Discharger 2
User manual, Version 1.1
LZ design d.o.o.,  Brod 3D, 1370 Logatec, Slovenia  tel [phone]
[email protected]  www.front-electric-sustainer.com

FES Discharger 2, user manual v1.1 December 2019
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Table of Content
1. Important notices ..................................................................................................... 3
1.1 Limited Warranty ................................................................................................. 3
1.2 Invalid Warranty .................................................................................................. 3
2. Introduction ............................................................................................................. 4
2.1 Technical characteristics ....................................................................................... 5
2.2 Touch LCD display ............................................................................................... 5
3. Warnings and safety instructions ............................................................................... 6
4. How to use .............................................................................................................. 6
5. Error messages ........................................................................................................ 8
7. Revision history ........................................................................................................ 9

FES Discharger 2, user manual v1.1 December 2019
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1. Important notices
This user manual contains important information about proper and safe usage of FES
Discharger 2. If something is not clear and you need more information, please contact the
manufacturer LZ design.
Information in this document are subject to change without notice. LZ design
reserves the right to change or improve this product and to make changes in the content
of this material without obligation to notify any person or organization of such changes or
improvements.
Warning: Means that the non-observation of the corresponding procedure
leads to an immediate or important degradation of the safety.
Caution: Means that the non-observation of the corresponding procedure
leads to a minor or to a more or less long-term degradation of safety.
Note: Draws the attention on any special item not directly related to safety
by which is important or unusual.
1.1 Limited Warranty
This product is warranted to be free from defects in materials or workmanship for
two years from the date of purchase. Within this period, LZ design will, at its sole option,
repair or replace any components that fail in normal use. Such repair or replacement will
be made at no charge to the customer for parts and labour, however the customer shall
be responsible for any transportation and custom costs.
Usage of device is at user’s own risk. LZ design will not under any circumstances
accept any responsibility or will be liable for possible damage on people, animals or things,
which might directly or indirectly happen from using the FES Discharger 2.
To obtain warranty service, please contact your local dealer or LZ design, directly.
1.2 Invalid Warranty
The warranty does not cover failures due to abuse, misuse, accident, or unauthorised
alterations or repairs.
The warranty becomes invalid in the case of discharging other than FES battery packs.
The discharger is not waterproof in anyway.
© LZ design. All rights reserved.

FES Discharger 2, user manual v1.1 December 2019
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2. Introduction
FES Discharger 2 is a standalone device. It was developed for safe discharging of
FES battery packs to 50% state of charge (SOC), which is most suitable for storage of
battery packs during longer time of inactivity, to achieve as slow as possible aging of
Lithium-ion cells.
Compared to previous “FES discharging assistant”, there is no need to connect
external DC load (oil radiator) anymore. Additionally, discharging power is higher so total
time to complete discharge is shorter.
Note: It is very important to distinguish between 14S (14 cells wired in
serial) and 16S (16 cells wired in serial) FES Battery packs, due to different
voltage level! FES Discharger 2 should be delivered already properly adjusted
for usage with your specific FES battery packs – 14S or 16S.
Warning: When connected to FES 14S Battery pack and before starting
discharging, “14S” indication must be visible on the LCD display (above SOC
value).
Warning: When connected to FES 16S Battery pack and before starting
discharging, “16S” indication must be visible on the LCD display (above SOC
value).
FES Discharger 2 is protected with 16 A 6.3x32 mm standard fuse in its own
housing which is accessible without opening the discharger.
16A 6.3x32mm standard glass fuse
Soft
ware
update
con
n
ec
tor
cov
er
cover
Touch LCD display
Cooling fan
+ and – connecting cable

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2.1 Technical characteristics
FES Discharger 2
End of discharge (50% SOC) 52 V in 14S configuration / 59 V in 16S configuration
Max. discharging power 425 W
Max. discharging current 9 A
Length of connecting cables 70 cm
Dimensions 365 x 110 x 110 mm (L x W x H)
Touch LCD display dimensions 65 x 35 mm (L x W)
Weight 2,9 kg
2.2 Touch LCD display
A touch LCD display enables easy operating and controlling (turning it ON and OFF)
of the device and shows the basic battery pack data.
The basic menu.
Configuration 14S/16S
State of charge (%)
START/STOP
touch button
D
ischarging
power (W)
Input voltage
(V)
Inter
nal
temperature
of discharger
(0C)
Message display line

FES Discharger 2, user manual v1.1 December 2019
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3. Warnings and safety instructions
The following warnings and safety instructions should be considered when using
the device:
 Do not start using a device before reading and understanding user manual.
 Place device on a flat and clean surface, with possibility of air exchange.
 Ensure the distance from the walls or other objects. Leave enough space (at least
30 cm) between the cooling openings and other objects or walls.
 Note that device and exhausted air will become warm during operation.
 Do not cover front or rear side of device in any way to block cooling air flow
through the device.
 Do not use in wet, dusty, moist, freezing, hot or dangerous environment.
 Keep away from children and unauthorised persons.
 Do not pull out the fuse or open software connector when the device is connected
to battery pack.
4. How to use
Read these operating instructions carefully before using the discharger for the first time.
Note: It is very important to distinguish between 14S (14 cells wired in
serial) and 16S (16 cells wired in serial) FES Battery packs, due to different
voltage level! FES Discharger 2 should be delivered already properly adjusted
for usage with your specific FES battery packs – 14S or 16S.
Warning: When connected to FES 14S Battery pack and before starting
discharging, “14S” indication must be visible on the LCD display (above SOC
value).
Warning: When connected to FES 16S Battery pack and before starting
discharging, “16S” indication must be visible on the LCD display (above SOC
value).
Caution: In a 1 m radius, remove the dust and all unnecessary things which
could prevent airflow through the discharger.

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1. Connect – and + connecting cable to the battery pack. FES Discharger turns ON
and FES logo appears on touch LCD display.
Welcome screen with FES logo
2. After a few seconds the menu with basic parameters shows up.
The basic menu
3. To start discharging press START on a touch LCD display. The fans start working
(cooling). A text “DISCHARGING” is displayed.
Power consumption start rising until maximal allowed discharging value.

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4. Discharging process is finished at 50% SOC. Buzzer sound becomes active for 10
seconds and a text “BAT PACK DISCHARGED” is displayed.
The cooling fans stop working when the temperature inside the discharger drops to 40 0C
or less.
5. Error messages
E
rror
message
S
ou
nd
E
rror
des
cription
Err
or reset
“INPUT VOLTAGE
TOO LOW”
0.2 s sound / 1 s
pause
Battery voltage is
under 49V.
Charge the battery.
“TEMPERATURE TOO
HIGH”
1 s sound / 1 s pause Inside temp. of
discharger is above
650C.
Press STOP button or
disconnect the cables.
“CHECK FUSE” 2 s sound / 1 s pause The fuse is missing or
is blown.
Disconnect the cables
and replace the fuse.
“FAN ERROR” 3 s sound / 1 s pause The fan is broken or
stuck.
Disconnect the cables
and remove the
obstacle.
In case of any other fault or damages, please contact LZ design directly.

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7. Revision history
August 2019 Initial release, user manual v1.0
December 2019 Updated and more detailed information, user manual v1.1