Notes On Causes Of Faults During The Battery Check - Ar54.10-D-1129-06A

Model 907 

Notes on possible errors in the battery test with the Midtronics MCR 717 

Incorrect execution of the battery test can lead to incorrect statements about the battery condition.

When checking the battery with the Midtronics MCR 717, the following points must be observed:

• Technical device condition 

  Deviations from the original condition of the measuring lines and the pole terminals lead to incorrect measurement results. The pole terminals are special "Kelvin terminals". Only the original clamps may be used.

  If the terminals are defective, the device does not necessarily have to be sent in for repair. Defective terminals can be exchanged separately, but if part of the cable in front of or in the terminal is damaged, the entire device must be sent in.

• The Midtronics MCR 717 must always be connected directly to the battery 

  It is not necessary to disconnect the battery poles for the measurement. The measurement is carried out directly on the battery and must not be carried out at other locations, such as the jump start support point.

• Incorrect data entry on the Midtronics MCR 717 will falsify the measurement result 

  All entries on the Midtronics MCR 717 must be carried out conscientiously.

• Load and retest 

  Batteries with the measurement result Charge and retest must have been tested before a retake examination Completely  loading.

  For a reliable assessment of such batteries, a so-called "partial charge" is sufficient. not from.

• Batteries always have to be charged after charging 

  After charging, the batteries have an increased surface voltage. This falsifies the measurement result or leads to an error message. Always load batteries for approx. 2 minutes after charging or let them rest for several hours. To load, for example, switch on the low beam and then let the battery rest for 5 minutes.

Additional batteries 

The Midtronics MCR 717 is only designed for testing starter batteries. Some additional batteries (e.g. traction battery) are designed to draw power over long periods of time. Therefore, no cold test current is specified on these batteries, only the open-circuit voltage can be checked.

Measuring the open-circuit voltage is a simple and effective method of checking the condition of the auxiliary battery (e.g. traction battery).

A built-in voltmeter is usually available in motorhomes for the measurement.

Resting tension  →State of charge 

• > 12,80 V → 100 %
• Ca. 12,55 V → 75 %
• Ca. 12,30 V → 50 %
• Ca. 12,20 V → 25 %
• < 12,00 V → 0 %

The measurement should be carried out at an ambient temperature of 20 to 25 ° C and a few hours after the end of charging.