UPS MKD2000/3000 XL
Manual
MKD XL Series
Page 38 of 45
13 Maintenance and service
You can expect a long service life and trouble-free operation from your UPS
equipment as long as you ensure that the necessary minimum level of
maintenance is carried out. However, the reliability of the UPS is also
significantly affected by environmental conditions. The temperature and
atmospheric humidity of the surroundings must be kept within the limits. In
addition, the area around the UPS must be kept as clean and free of dust as
possible. At the ideal ambient temperature of 22°C, the typical service life of
the batteries is approx. 4 years, but this service life can be substantially
increased (to approx. 8-10 years) by using special batteries.
You should check at regular intervals (every 6-12 months) to ensure that the
remaining bridging time is sufficient for your intended purposes. If this is not
the case, then it is time to replace the batteries.
13.1 Measuring and autonomy time
Before starting this procedure, it is absolutely necessary to save all open data.
Also inform all employees concerned.
There are essentially two methods of measuring the autonomy time. Method a)
is suitable for measuring the actual autonomy time, whereby the consumer
loads will inevitably have zero current at the end of the bridging time.
Method b) enables the residual capacity to be determined after a specific
autonomy time, whereby consumer loads will not generally be left with zero
current.
To apply one of the named methods, force the UPS into support mode by
switching off the mains power supply.
After performing the measurement, switch the mains power supply back on
and start the UPS as normally using the buttons “ON”.
Bear in mind that after the measurement the batteries will be discharged, i.e.
the on-line/charging mode must have been active in the UPS equipment for
several hours (min. 5 hours) before they are approx. 80% operational again.
If the support time is not measured due to local conditions or directives, we
recommend replacing the batteries every two years as a preventive measure to
avoid the risk of inadequate support time due to battery deterioration.
13.2 Replacing the batteries
Before you proceed, take the safety information provided into consideration.
Carry out the work in the specified sequence. Always use safety tools.
Before you start work, make sure that the UPS is switched off and is
disconnected from the mains power supply.
