Standby Power System Checks - Nortel DMS-100 Series Maintenance Manual

3–34 Power system maintenance

3.9 Standby power system checks

Maintenance of the DMS standby power system is crucial to the prevention
of switch downtime resulting from commercial power interruptions. Keep
detailed records to ensure that proper maintenance of the standby power
system is being performed. This section recommends several records and
control logs for recording maintenance information on the standby power
system. Other forms or systems that record the same information may be
substituted.
Office control records and logs provide a means for tracking key
maintenance information on the performance and reliability of standby
power equipment.
The routine run frequency of the standby engine-alternators is based on local
conditions. However, a minimum routine run of two hours under a normal
loaded condition once per month, and a routine run of seven hours once per
year, is recommended.
The frequency of a routine run in locations using mobile standby
engine-alternators is based on local conditions. However, a routine run of
once per year is recommended.
Each time a routine run is performed, verify that stationary
engine-alternators start properly and mobile engine-alternators are
dispatched and connected in a timely manner. Check the load on 3-phase
alternators for proper load balance to determine if it is within the capacity of
the alternator. Check the engine for proper fuel, lubricant, and coolant
levels.
The forms in Figure 3–5 and Figures 3–7 through 3–12 are the suggested
forms for recording the results of the routine engine-alternator runs.
297-1001-350 Standard 02.02 August 1997