MICRO-POWER MTM Parts list manual

Document no.
99-99-111
MTM
Technical description

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Document no.
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CONTENTS
1 INTRODUCTION 4
1.1 About this description 4
1.2 Installation and commissioning 4
1.3 General information on MTM 4
2 CHARGE CURVE 5
2.1 The various phases of the charge curve 5
2.2 Example of a charge curve and time settings 7
2.3 Solution to sulphation 8
2.4 Delayed start 8
2.5 Extra charging 8
3 READING AND EDITING DATA 9
3.1 Menu system, overview. 9
3.2 Menu system structure 10
3.3 Reading data 10
3.4 Data protection 10
3.5 Editing data 10
3.6 Functions 10
3.7 Description of the menu groups 11
3.7.1 General functions in the first screen 11
3.7.2 Charging algorithm 12
3.7.3 Charger 13
3.7.4 Options 13
3.7.5 Adjustment of measurement system 14
3.7.6 Statistics 14
3.7.7 Service 15
4 SERVICING AND MAINTENANCE 16
4.1 Main pcb 16
4.2 Thyristor control PCB (6-pulse bridge only) 17
4.3 Processor c.b. 18
4.4 Main circuit 19
4.5 Basic setting 19
4.5.1 General 19
4.5.2 Procedure 19
4.6 Adjustment of measured values (calibration) 20
4.6.1 General 20
4.6.2 Procedure 20
4.7 Troubleshooting 21
4.7.1 General 21
4.7.2 Checking thyristors and diodes 21
4.7.3 Error messages in alphabetical order and suggested action 22
5 APPENDICES 29
5.1 Tables 29
5.1.1 Adaptation to model. 29
5.1.2 Hardware code 30
5.1.3 Charging algorithms 30

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1 INTRODUCTION
1.1 About this description
These instructions are aimed primarily at trained staff and describe how to handle a
standard MTM in a standard application.
For special areas of application, such as AGV charging, please see separate documents,
which describe the charge curves and functions used in these special cases.
1.2 Installation and commissioning
See the user manuals for the respective chargers. The charger is normally supplied set
for the battery type indicated in the order.
1.3 General information on MTM
Charger type MTM is a fully automatic charger designed for charging all types of
battery with a system voltage from 12 V up to the charger’s rated voltage, and with great
variations on ampere-hours.
This charger is able to charge and provide constant trickle charging of both tractionary
and stationary batteries. Charging can be optimised for every type of battery and all
kinds of operating conditions. With the guidance of a programmed charge curve, the
charger’s computer constantly calculates the optimum charge power and monitors
charging from start to finish.
Voltage, current, charged Ah, charging time, etc. can be viewed in the display using the
keyboard.
Faults are indicated by means of one or more flashing LEDs, as well as error messages
in the display.
The MTM comes with a real-time clock with battery backup which indicates the precise
setting of delayed charging, weekly charging, etc. Important events such as the start of
charging and abnormal cutoffs are logged with a time stamp, which facilitates later
servicing.
Statistics for the last five charges and information on the battery’s operating profile are
stored in the memory. With the guidance of this information, it is possible over time to
implement actions to minimise the risk of repeated deep discharges, etc. which may
damage the battery in the long term.
The MTM is supplied with predefined charge curves for the most common freely
ventilated and sealed battery types.

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2 CHARGE CURVE
The MTM is able to charge in accordance with a number of charge curves so as to suit
any battery. A charge curve is often established by the battery manufacturer and consists
of various elements, such as constant current, constant voltage, pause, etc., as well as the
parameters, which control the various elements.
Changing the parameters which control current, voltage and charging times can give
different charging properties, such as a shorter charging time or very low maintenance
requirements. Your requirements should be discussed with the battery manufacturer
before making any changes to the charge curve. Inappropriate settings may shorten the
service life of your battery.
The MTM has functions for easily setting a number of predefined charge curves for
most battery types on the market.
2.1 The various phases of the charge curve
See also the figure in section 2.2 and the description of parameters in section 3.7.2
A Pump phase (all three LEDs flash and the error message “low dc voltage” is
displayed)
This charging phase appears in most charge curves. This phase starts if the battery’s
back voltage is more than 6 V but less than the lower start limit. This occurs in the event
of deep discharges due to too high a capacity drain.
Charging takes place with the I3 current up to max U3 voltage over approx 2 min. Then
charging pauses for approx. 10 s, during which time the back voltage is measured. If the
back voltage exceeds the voltage level Ug, the phase is terminated and the next charging
phase starts. If not, another 2 min charging phase begins. This goes on until the
approved voltage is attained. This function can be activated/disabled using the control
register.
B I0/U0 (first yellow LED comes on)
This charging phase is a precharging phase with constant current and constant voltage
used when short charging times are required. I0 is often higher than the battery’s 5-hour
current. The charging phase continues until U0 has been attained and the current has
fallen to I1 (the current for the next charging phase) or if the set max time, “max I0
time”, has been attained.
This element can be activated/disabled using the control register.
C I1 (first yellow LED comes on)
This is the first charging phase on a normal charge curve. It consists of a constant
current I1 until voltage U1 has been attained or the max time, max I1 time, has been
attained. The charging phase can also be terminated if the max number of Ah has been
exceeded or if the voltage levels out or even drops (battery fault dU).
D U1 (both yellow LEDs come on)
This phase is a constant voltage phase which continues until the current has fallen to the
set limit value, “start I2 phase”. The switchover to the next charging phase can be
delayed using the parameter “Min I1U1 time”.
During this charging phase, voltage drops also take place, with the relevant

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measurements in order to ensure that correct recharging takes place. This charging phase
is terminated if the max time or max Ah has been exceeded or if the current levels out or
even rises (battery fault dI).
E I2 (second yellow LED comes on)
This charging phase is also known as “additional charging”. When it starts, just as many
Ah have been recharged as have been discharged from the battery. This Ah value is
multiplied by the “charging factor normal” factor and the charging phase continues until
this value has been recharged. However, this is limited by the time settings “min I2
time” and “max I2 time”. Current and voltage are limited by the parameters I2 and U2.
F Trickle charging (green LED comes on)
Trickle charging normally continues until the battery is disconnected from the charger.
There are two types of trickle charging: constant and pulsed. Which type is used is
dependent on the charge curve selected.
Constant trickle charging indicates – as its name implies – constant voltage U3
(normally 2.26 V/c for this type of trickle charging) with max current I3.
Pulsed trickle charging begins with charging being stopped. When the battery voltage
has fallen to voltage U3 (normally 2.17 V/c for this type of trickle charging), a charging
pulse, max current I2, max voltage U2, begins which lasts 2 min. Charging is then
stopped again. The charging pulses cannot occur more often than once every
30 minutes.
G Equalising charge (green LED comes on)
This charging phase is used mainly in charge curves for sealed lead batteries. It starts
after a pause and consists of a low current, I4, with max voltage U4 over a long period.
The pause at the start of the charging phase means that it is active only on the rest day
which is recommended when sealed lead batteries are used.

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2.2 Example of a charge curve and time settings

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2.3 Solution to sulphation
If a battery is subject to repeated incomplete charges, the lead sulphate crystals
remaining will gradually form larger crystals, which are more difficult to dissolve and
do not have time to dissolve during normal charging.
Demands for faster charging, lower energy consumption, reduced water usage and gas
production also enhance the risk of sulphation.
A heavily sulphated battery is best charged using a low average current over a longer
time. The easiest, most common method is to charge at a current of approx. 0.5-1% of
the battery’s rated capacity for two days up to several weeks, depending on the degree of
sulphation.
Resetting trickle charging on an MTM can allow good results to be attained without you
having to invest in new equipment. This is what you have to do:
Select charge curve 10-5. Reset voltage U3 to 2.8 V/c. Set current I3 to 2%. Leave these
settings as they are for up to four weeks if you suspect heavy sulphation. Measure the
density at regular intervals after full charging. You can continue for as long as the
density goes on increasing in any of the cells. Once the cells are equalised or the density
is no longer falling, return voltage U3 and current I3 to their normal values.
2.4 Delayed start
To be able to use off-peak electricity, the real-time clock in the MTM can be used to
start charging at a time when power is cheap.
If a battery is connected for charging between 13:00 and 23:59, charging will commence
only at the time programmed in “Delayed charging”. If a battery is connected for
charging between 00:00 and 12:59, charging will commence immediately, irrespective
of “Delayed charging”. This permits lunchtime charging.
The delay is interrupted and charging begins immediately if any of the keys 0-9 is
depressed. The * and # keys have no effect on the function for permitting data to be
read.
Check that the available charging time is sufficient to charge the battery fully.
If a start time of 0 is programmed, this function is terminated.
2.5 Extra charging
One effective way of rectifying problems with batteries suffering from “that Monday
afternoon feeling” is to carry out extra charging, beginning approx. 2 hours before the
battery is used.
The time and day are programmed in the “Extra charging” menu displays.
If a start time of 0 is programmed, this function is terminated.

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3 READING AND EDITING DATA
3.1 Menu system, overview.
This is only an example. The menu system varies depending on the installed program
version.
Menu guide
MTM 0.40
#
*
The values in the menu system are only examples, and can vary depending on charger, battery and charging algorithm. Some menu itemsin the diagram are not shown if related functions are unprogrammed. Values represented by dots areautomatically calculated with respect to the relation between the rated current of the charger and the size of the battery.

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3.2 Menu system structure
The menu is divided into groups of close functions and data as described in the
overview in 3.1.
Use the * button to select a group. A new group will be displayed every time you press
the * key. The first one will be displayed again after the last one.
The first screen is the one which normally appears in the display. This screen contains
information on the charge current, charge voltage and time.
If there is a fault, one or more LEDs flash and an error message appears in the top line
of the display. If a number of faults are registered, these are shown one after the other at
intervals of a few seconds. An overview of error messages and suggested action can be
found in section 4.7.3.
3.3 Reading data
Select the required group by pressing the * key repeatedly. When the required heading is
displayed, press the # key to read data in the group. Pressing * will display the heading
once again, and new groups can be selected.
If no key is pressed within one minute, the display will return automatically to the first
screen.
3.4 Data protection
Data, which affects charger function, is protected against accidental editing. Write
protection is switched off temporarily if the security code 2451 is entered when the first
screen is displayed. The correct code is indicated by means of a long tone. This
procedure is known as “unlocking” in everyday parlance. Write protection is activated
automatically if the keyboard is not used for one minute.
If write protection is active, no data can be entered.
To minimise the risk of damage to the battery or charger, a checksum is calculated for
charger and battery data. This checksum is compared with stored data every time the
charger is started, and if the information in the memory has been edited during any
disruption (such as a thunderstorm), this will result in a checksum error (see section
4.7.3, “C/S error EEPROM”). In such cases, charging does not commence.
3.5 Editing data
Unlock the menu system. Press * until the required heading is displayed. Then press #
until the required parameter is displayed. Enter a new value and confirm by pressing #.
Data is saved at the same time as the next parameter is displayed. When all changes
within the group are complete, press * to return to the heading. Your changes will then
be confirmed and a new checksum will be calculated and saved.
N.B.: do not switch off the power while changes are in progress unless you have pressed
* first. If you do, this will result in a checksum error (see section 3.4 and 4.7.3, “C/S
error EEPROM”).
If no key is pressed within one minute, your changes will be saved automatically, the
display will return to the start screen and the menu system will be locked.
3.6 Functions
Some menu screens permit the starting of functions such as the equalising charge
function, basic programming, deletion of statistics, etc. One thing all these screens have
in common is that they have an input field that looks like this (****). This function is

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activated immediately if the security code (2451) is entered, as long as write protection
has been disabled by entering 2451 in the first screen.
3.7 Description of the menu groups
This description is relevant for standard programs: additional functions may be
implemented in other versions.
3.7.1 General functions in the first screen
Date and time.
Displays information directly from the real-time clock.
Charging start.
Displays the time when the last charge started.
Charged capacity.
This function displays the charged capacity while charging is in progress.
“I1 time”, “I1U1 time” and “Total time” inc. charged capacities in these intervals.
These screens display simple statistics from various parts of the last charge. If
charging is in progress and the relevant charging mode has not finished, the time and
ampere-hours are set to 0.
Corresponding information from the previous four charges is stored under the
heading “Statistics”.
Component temperatures.
Displays current temperatures on: circuit board (PCB), thyristor cooler (Th) and
transformer or choke (T).
Pump pressure.
Displays the current air pressure if the charger is fitted with an acid circulation pump.
Activate equ charge.
Some charge curves contain an equalising charge function. Entering the security code
activates the equalising charge function for ongoing charging, the user has the
opportunity to edit the voltage, current and length parameters. When activated, the
equalising charge function begins after regular charging.
Start equ charge.
Using this function allows the user to start the equalising charge function directly
instead of it starting after regular charging.
Extra charging, day and time.
Programming of the time (whole hours) for the starting of extra charging.
Delayed start in hours.
Programming of the time (whole hours) for delayed starting. Permits the use of off-
peak electricity.

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3.7.2 Charging algorithm
In this group, the parameters are programmed which produce a correct charge curve.
The MTM charging program contains a number of charge curves which can be selected
using the keyboard. The active curve is displayed in the menu header.
Battery capacity, no. of cells.
It is important to specify the battery capacity so that all the current values in the
charge curve are adjusted to suit the battery. All currents are specified as a percentage
of I5 (the battery’s 5-hour current, i.e. Ah/5) or I1 (the battery capacity) depending on
the programming of control registers (see below).
The value in “no. of cells” is used to calculate all charge voltages in the charge curve.
These charge voltages are specified in V/cell.
The following parameters are set automatically when you select a charge curve under
“Service” (see 3.7.7). These parameters are set at delivery and should only be edited in
consultation with the supplier of the battery or charger.
N.B.: not all parameters are used in all charge curves.
Charging factor normal, charging factor acid circ..
How much energy has been discharged from the battery is calculated during
charging. This value is multiplied by the charging factor, and when 100% of the
energy discharged has been recharged, additional charging starts which goes on until
the calculated number of Ah have been recharged. The user has the option of
programming the charging factor for batteries both with and without acid circulation.
With the guidance of the pump pressure entered, the program selects a charging
factor in accordance with the values programmed into “charging factor normal” or
“charging factor acid circ.”. This results in correct charging even if there is a fault in
acid circulation.
Current I0, current I1, etc.
Indicates charge currents as a percentage of I5 or I1 for the various charge curve
elements.
Voltage U0, voltage U1, etc.
Indicates the charge voltage in V/cell for the various charge curve elements.
Max I0 time, max I1 time, min I1U1 time, etc.
Max times exceeded result in safety shutoffs (apart from I0 time). This is designed to
protect the battery in the event of a fault. The max times for I0, I1 and I1U1 are
calculated automatically, taking into account battery and charger size if the value 0 is
programmed. This automatic function is indicated by ··:··.
Min times mean that the charging program will not continue until this amount of time
has passed. E.g. min I1U1 time and min I2 time.
Baseload
If the battery is under load during charging, this current should be compensated for.
Measure and program the load current. All currents are compensated with this value.
Control register 1 and 2.
With different values in the “control register” parameter, it is possible to switch on

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and off functions such as the programming of currents as a percentage of I5 or I1,
monitoring of the battery current and voltage derivative, I0/U0 phase, etc.
3.7.3 Charger
The charger’s rated data, among other things, is programmed in this group (see the
rating plate on the charger). See also the table in section 5.1.
Rated current.
Program this value in accordance with the rating plate on the charger. Entering an
incorrect value may damage the charger or cause a long charging time.
Maximum current
Factory set.
Mains code
This parameter tells the program what type of mains voltage the charger is connected
to. See the table in section 5.1.
Incorrect value gives incorrect function.
Lower start limit, upper start limit.
The charger starts when a battery is connected if the battery voltage is between the
limit values of “lower start limit” and “upper start limit”. If there is no battery at all,
i.e. the voltage is less than 6 V, a “connect battery” message is displayed.
System voltage code, system current code.
These parameters tell the program what voltage input is used and which shunt is
installed. Incorrect values mean that the charge currents and voltages are too high or
too low, which can damage the charger and battery.
See the table in section 5.1.
N.B.: if any of these parameters is changed, the corresponding measured value must
always be calibrated.
System RI
To minimise the charging time, the MTM compensates for voltage drops in
secondary cabling and socket. The display shows the compensated value, i.e. the
voltage the battery is estimated to have. Specify the measured or estimated resistance
in the format 0.1 m. See also the table in section 5.1.
Bridge type
Two types of thyristor bridges are used in MTM. Smaller chargers (up to 150A)
usually have a 3-pulse bridge. Chargers with a nominal current of 175A and above
usually have a 6-pulse bridge. These chargers are fitted with an extra Thyristor
Control PCB (see section 4.2). See the table in section 5.1.
3.7.4 Options
This group includes parameters which define which auxiliary equipment is fitted in the
charger. Acid circulation pumps, extra I/O cards and temperature sensors are examples
of such equipment.
Acid circulation pump type, pump on, pump cycle, underpressure, overpressure
These parameters tell the program what type of pump is fitted, how pumping is to
take place (interval and length) and what pressure is to be considered normal. If the
pressure is outside of the approved range, the charging factor for a normal battery
(without acid circulation) is selected and an error message is displayed.

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Pump types: no pump = 0, API pump = 1.
Pump on: Indicates how much of the pump cycle pumping is to cover.
Pump cycle: Indicates how often the pump is actuated in the case of interval
pumping.
I/O PCB type, relay config, remote config
These parameters tell the program whether additional relay cards are fitted, whether a
remote input is used and, if so, how this is to work.
These functions are used in particular in AGV applications (driverless trucks) and are
described in separate documentation.
Aux temperature sensor type, max temp at full power, voltage compensation.
If a battery ID unit (IDB) is fitted to the battery, temperature information from this
can be used to adjust the charge curve and output so as to achieve optimal charging.
ID-system type.
This parameter activates the communication between the charger and the IDB-unit on
the battery.
3.7.5 Adjustment of measurement system
The measured values are normally adjusted only when components and PCBs in the unit
are replaced.
Use an accurate measuring instrument (digital voltmeter and clip-on ammeter) to
measure the unit to be calibrated. Enter this value followed by #. The microprocessor
then calculates the trim values, which are stored in the memory. See the instructions in
section 4.6.
3.7.6 Statistics
This group shows how the battery has been used in respect of depth of discharge, along
with data from the last four charges.
Cycles nn%-nn%.
The MTM saves statistics which indicate how much of the battery capacity has been
used whenever it has been used, divided over 6 intervals. These intervals are set by
means of the parameters “limit 1” – “limit 4”. These intervals are set to 2-50%, 50-
70%, 70-80% , 80-90% and over 90% by default. The statistics are based on the
calculated depth of discharge, i.e. additional charging is not included.
No. of disrupted chargings
Disrupted charging relates to charges which have taken more than one hour but were
interrupted by the user before charging was complete. The time limit of one hour
means that pause charges are not recorded as disrupted chargings.
Charging start, I1 time and charged capacity, etc.
The following screens show data from four of the five last charges (see also 3.7.1).
Error message statistics
The last six safety shutoffs, together with when they occurred, are saved here.
Limit 1, limit 2, etc.
The MTM saves statistics on discharges in 5 intervals with 4 programmable limits. If
the statistics limits are changed, statistics saved previously will become invalid and
should therefore be deleted (see3.7.7).

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Interval no. Area Range at delivery
1 2% – limit 1 2% – 50%
2 limit 1 – limit 2 50% – 70%
3 limit 2 – limit 3 70% – 80%
4 limit 3 – limit 4 80% – 90%
5 limit 4 and above 90% –
3.7.7 Service
“Service” includes functions for setting the clock, basic programming of the charger,
resetting the statistics, etc.
Set time hh:mm
Specify the time in 24-hour format.
Set date
Specify a date in month-day format.
Set day of week
Specify a day of the week, 1-7: day 1 is Monday and day 7 is Sunday.
Set year
Specify the year using four digits (e.g. 2003).
Set charging algorithm.
Adjust the charger to the battery by selecting the correct charge curve. This should be
done in consultation with the supplier of the battery or charger.
Default program
See the detailed description in section 4.5
Clear all statistics
Input the security code to delete all statistics stored in the charger memory.
Clear all IDB data.
If you see the error message “CS err. IDB data” and you are not using an IDB system,
this function must be used and the charger restarted.
Hardware code
Certain changes have been made to the MTM main pcb in order to enhance
performance. The program has to take these changes into account. Hardware code 0
is used for version MK1128-03 and earlier, while hardware code 1 must be used for
MK1128-04 and later. NOTE: The display always shows 0 and not the programmed
value. See also the table in section 5.1.2
Volume.
Influences the volume of the acoustic signal. The volume is set to the highest value at
the time of delivery.
The values 0 – 128 vary the volume from entirely silent to max volume.
SCR trigging.
This value gives a measure of the output phase angle. Used for fault finding.
Internal register, X ram, etc..
These functions are designed only for advanced troubleshooting.

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Thyristor
test
Testpoints
Power LED
Fuse 1,25A
Thyristor active LED
Service plug
Cooling-
fan
Pump/aux
relays
Contactor
LED
Relay
Active
4 SERVICING AND MAINTENANCE
4.1 Main pcb
Connection Function
J1 Power supply 170-260VAC
J2 Contactor control
J3A-B Acid circulation pump output / Auxiliary relay output
J4A-C Cooling fan power
J5 Thermostat input (over temperature protection)
J6A-J6B Service connector
J7 Temperature sensor input (1-2 cooling fin, 3-4 transformer/choke)
J8 Remote start input, shunt signal, analogue 0 and battery voltage.
J9 Input for phase detector
J10 Thyristor gate output
J11 Power supply for optional pcb (I/O-pcb, IDB-transceiver)
J12 Processor c.b. connection (flat ribbon cable)
J13 Thyristor test jumper.
J15 Gate control for extra thyristors (6-pulse)

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4.2 Thyristor control PCB (6-pulse bridge only)
Connection Function
J1 Power supply for optional pcb (I/O-pcb, IDB-transceiver)
J2 Power supply from Main PCB
J3 Gate control signal from Main PCB
J4 Shunt Input/Output
J5 Thyristor gate output
J6 Power supply for IDB communication PCB
J7 I2C-bus
J8 I2C-bus
J9 Thyristor test
Thyristor
active LED

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4.3 Processor c.b.
Main board connection I/O-pcb
connecti on
Power LED
RTC battery
CR2032
E-prom
Pin 1
Write protect jumpers
I2C tranceiver

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4.4 Main circuit
Incoming power is connected to terminals L1, L2 and L3. The voltage is fed through the
main contactor K1 and chokes L1 – L3 to the primary side of transformers T1 – T3.
Contactor K2 activates immediately before K1 and feeds the voltage through resistors
R1 – R3 to the transformers which are magnetized. This switching limits the connection
impulse.
The secondary side of the transformer is connected to a rectifier with diodes and
thyristors. The component type depends on the charger’s rated current.
The rectifier bridge is connected to the charger’s plus output through a knife or truck
fuse and to the minus output through a shunt.
4.5 Basic setting
4.5.1 General
If a new computer card is fitted to the charger, this is normally unprogrammed. The
“default program” function can be used to keep to a minimum the number of values
which have to be input. Here are some step-by-step instructions on how to do this.
Firstly, read through section 3.5 and 3.6.
4.5.2 Procedure
Remove any protective paper from the real-time clock battery.
Install the card in the unit.
Start the charger without connecting the battery.
When the first screen is displayed, enter the security code 2451 (digits entered will
not be displayed). A signal is emitted by way of acknowledgement.
Press * until you see “service”. Press # until you see “default program”. Enter 2451.
The display shows “set charging algorithm”. Select a charge curve suitable for the
battery (e.g. 10-05) followed by #. A charge curve should be selected in consultation
with the supplier of the battery or charger.
The display shows “set time”. Set the time, date, day of week and year, each followed
by #.
Press # until you see “clear all statistics”. Press “2451”. The menu system returns to
“set time”.
Press # until you see “clear all IDB data”. Press “2451”. The menu system returns to
“Service”.
Press # until you see “Hardware code”. Programme values in accordance with the
table in section 5.1.2.
Press * until you see “Charging algorithm”.
The display shows information on the active curve. Press # and program the correct
value for battery capacity and the number of cells. Other parameters should only be
changed in consultation with the supplier of the battery or charger. Finish by pressing
# followed by *.

20 (30)
Document no.
99-99-111
Version
6
Date
2003-10-16
Sign.
ToNo
Press * until the display shows “charger”. Press # and set the correct rated current,
mains code, shunt and voltage code, as well as the cable resistance and the type of
bridge (see the table in section 5.1.1). Finish by pressing # followed by *.
Press * until the display shows “options”. Press # and change the parameters
required.
Press * until you see “adjustment of measurement system”. Press # and enter the
value 0 for charge current, charge voltage, control voltage and temperature. This
procedure roughly adjusts all measured values.
If the charger is fitted with an acid circulation pump, enter the security code in the
“set pressure to zero” function. End by pressing *.
When the display shows “adjustment of measurement system”, shut down and restart
the charger.
Press # and check the time and date.
Adjust the measuring system as outlined in section 4.6
4.6 Adjustment of measured values (calibration)
4.6.1 General
All components have a specific tolerance, and this means that values input for current,
voltages and temperatures have to be calibrated during the manufacture of the charger.
When measured values are adjusted, the processor is allowed to calculate trim values
which are stored in the parameter memory.
After delivery, measured values are normally adjusted only when motherboards or
computer cards are replaced.
Use an accurate measuring instrument (digital voltmeter and clip-on ammeter) to
measure the unit to be calibrated. Then enter this value followed by #.
4.6.2 Procedure
Connect a voltmeter to the terminals on a discharged battery. Attach a clip-on
ammeter around one of the charging cables. Open the door and disconnect the
connector for the operating voltage of the contactor.
Connect the battery to the charger.
Start the charger and enter the security code 2451 (write protection is disabled).
Press * until the display shows “adjustment of measurement system”.
Press # until the display shows “charging voltage”. Read the battery voltage on the
external voltmeter and enter this value with a decimal, followed by #.
Press # until the display shows “mains voltage”. Open the door and measure the
voltage between terminals 10 and 11. Key in the value with one decimal, followed by
#.
Turn of the charger. Open the door and install the connector for the operating voltage
of the contactor.
Start the charger and enter the security code (2451).
Press * until the display shows “adjustment of measurement system”.