USV ME400/500/600/650/800
Instruction Manual
ME series
Page 26 of 32
13 Maintenance and servicing
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 the bridging time (support time)
Before starting this procedure, it is absolutely essential to save all open data.
Also inform all employees concerned.
There are essentially two methods of measuring the support time. Method a) is
suitable for measuring the actual support 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
support 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 normal using the main switch.
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.
