Network Control Module 300 Series Technical Bulletin 16
Battery Pack
The battery pack (Figure 1: Callout 11) is secured to a cover and fits
over the SIMMs. It automatically recharges from the NCM and
maintains the operating system and databases in RAM for up to a
72-hour power failure. Refer to Table 6 for backup times according to
memory configuration. You can check on the battery’s status in three
ways: a Light-Emitting Diode (LED) indicator, under NCM
Diagnostics (NCM Misc Data), or by using WNCSETUP and choosing
the Command: Information option (good, bad, not installed).
The NCM arrives from the factory with the battery pack unconnected.
Connect the battery last when installing the NCM.
Table 6: Battery Backup Times
Memory Configuration Backup Time (Hours)
No SIMMs (base memory)*
72
With two 1 MB (3 chip) SIMMs
72
With two 1 MB (9 chip) SIMMs
50
With four 1 MB (3 chip) SIMMs
58
With four 1 MB (9 chip) SIMMs
34
With two 4 MB (3 chip) SIMMs
72
With two 4 MB (9 chip) SIMMs
50
* Standard for the NCM350-8
You must install the battery and power up the NCM for at least
12 hours to ensure the backup times listed in Table 6. As a guideline, if
you have an NCM with no additional SIMMs, you get about 10 hours
of backup time for each hour of charge time.
Power Up Conditions
The Network Control Module powers up in either a cold-start or a
warm-start condition. In the cold-start condition, the NCM
automatically requests the OWS to download the code and database
information into the NCM’s memory. Refer to the Operator
Workstation User’s Manual. In a warm-start condition, the code and
database are stored in memory, and the NCM is fully operational
following the initial diagnostic tests.
By retaining memory during a power cycle, the battery backup
provides a warm-start condition when power returns to the NCM. If a
Power Fail occurs and the battery is good, a Power Fail message is
entered into the NCM error log (NCM3xx and Metasys Release 11.00
or later).
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