MicroPower MTM - Adjustment of Measured Values (Calibration); General; Procedure

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”.