Alpha Technologies XM2, XM2-HV, XM2-HP - Manual (Page 35)

N+1 (optional):
The N+1 ports are used in redundant system configurations where multiple
power supplies are housed in a single enclosure. With the installation of the optional
Protective Interface Modules (PIM) on the power distribution board, a second output
connection becomes available and allows the CableUPS to function as an N+1 redundant
power supply system. In the event of a power supply failure, a redundant power supply (with
an optional PIM board installed) is automatically switched into service with approximately a
8ms delay. This feature is part of the PIM option.
This provision also protects system components by shutting down the load during overcurrent
and short circuit conditions. Adding a PIM in the secondary power supply enables both power
supplies to be connected in a “dual redundant” configuration so the system can protect two
critical loads.
2.7 Programming the PIM
Programmable parameters (with PIM installed) are:
Channel 1 Overcurrent Limit: The RMS current level that causes the Output 1 protection
relay to trip after a specified delay (overcurrent tolerance period).
Channel 2 Overcurrent Limit: The RMS current level that causes the Output 2 protection
relay to trip after a specified delay (overcurrent tolerance period).
Retry Delay: The time between each attempt to restart an output in the event of an
overcurrent event.
Retry Limit: The number of times the CableUPS attempts to restart an output connection.
Once the RETRY LIMIT is exceeded, standard models attempt to restart the output
connection every 30 minutes (HV models do not attempt to restart after the retry limit is
exceeded). Set this parameter to “zero” to disable the “automatic retry” function.
Overcurrent Tolerance Period (1-10 seconds): In the event of an overcurrent episode,
the amount of time an output overcurrent condition is permitted on either output connection.
Once this time expires, the output protection relay disables its output feeder.
Reset Output 1/Reset Output 2: Once fault condition has been corrected, this manually
resets tripped output.
Programming any of the above parameters will reset the “trip/retry” counters.
NOTE:
If the optional PIM is not installed, the values shown on the “PIM PARAMETERS” line of the Smart
Display are “read only”.
NOTE:
35 017-805-B0-010 Rev. K2