11: Remote Power Managers
EMG™ Edge Management Gateway User Guide
243
continue to run until its battery fails completely, to shutdown just the UPS with the low battery, or to
shutdown one or more UPSes. UPS-type RPMs can report the following states:
OL
- On line power
OB
- On battery power
LB
- Low battery
HB
- High battery
RB
- The battery needs to be replaced
CHRG
- The battery is charging
DISCHRG
- The battery is discharging (inverter is providing load power)
BYPASS
- UPS bypass circuit is active - no battery protection available
CAL
- UPS is currently performing runtime calibration (on battery)
OFF
- UPS is offline and is not supplying power to the load
OVER
- UPS is overloaded
TRIM
- UPS is trimming incoming voltage
BOOST
- UPS is boosting incoming voltage
FSD
- UPS is in forced shutdown due to a critical condition
Once a UPS is on line power (status is
OL
) and goes off of line power and onto battery power
(status is
OB
), it may reach a low battery state (status is
OB
,
LB
or
LB
). Switching from line power
to battery power, and reaching a low battery state are critical states that can result in syslog, email
and SNMP trap notifications. The exact point at which a UPS reaches a low battery state is device
dependent and is related to the
battery.charge
,
battery.charge.low
,
battery.runtime
and
battery.runtime.low settings which can be viewed in the "Raw Data" report.
Once a UPS reaches a low battery state, the
Shutdown Order
,
Low Battery Action
and
Provides EMG Power
settings determine which UPSes to shutdown, and in what order. The UPS
with the low battery will be placed into
FSD
(Forced Shutdown) mode. The following actions will be
performed based on the
Low Battery Action
setting for the UPS with the failed battery:
Allow Battery Failure
- The UPS battery will be allowed to run until it fails completely. If the
UPS provides power to the EMG and the battery fails, the EMG will not be cleanly shutdown.
In this scenario, the
Shutdown Order
setting will be ignored. The
Shutdown Order
setting
may be used if another UPS reaches the low battery state (see
Shutdown all UPSes
below).
Shutdown This UPS
- If the UPS provides power to the EMG, the EMG will begin shutdown
procedures, shutting down the UPS last. If the UPS does not provide power to the EMG, the
UPS will be shutdown, but will continued to be monitored in case it comes back online.
Shutdown all UPSes
- The EMG will begin shutting down all UPSes with a non-zero
Shutdown Order
, shutting down UPSes with a shutdown order of "1" first, UPSes with a
shutdown order of "2" second, etc. Any UPS which provides power to the EMG is always
forced to have its
Shutdown Order
set to 50, which the highest (and last) Shutdown Order. If
the UPS with the failed battery provides power to the EMG (and thus has a Shutdown Order
set to 50), the EMG will also begin shutdown procedures, shutting down the failed UPS last. If
none of the UPSes provide power to the EMG, after they are all shutdown their drivers will
remaining running in case the UPS comes back online. In this case, any queries to an RPM
while it is still offline may report "RPM driver data is stale". If the
Low Battery Action
for a
UPS is set to
Allow Battery Failure
, but the UPS has a non-zero
Shutdown Order
, the UPS
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