Emerson 250-400kVA - Manual (Page 57)

UPS Alarm and Status Messages
51
Equip
Ovtemp
Limit
This summary event occurs when one or more
internal temperatures have exceeded the
maximum temperature setpoint. This is the
second of two over temperature alarms. The first,
“Equipment Overtemperature Warning,” sets
when the detected temperature is near the limit.
The controls react to this condition in various
ways, depending on which sensor is reporting the
over temperature condition.
Press “SILENCE” to silence the audible alarm.
Check the One-Line Display for system status:
1. UPS Off
a. If external Maintenance Bypass is available,
close the Maintenance Bypass Breaker
(MBB) to restore power to the load. Do not
attempt to restart the UPS without first
contacting your factory-authorized service
provider.
b. If external Maintenance Bypass is not
available, but the CB3 option is visible on the
One-Line Display, verify the bypass line is
green and close CB3 to restore power to the
load. Contact your factory-authorized
service provider.
2. UPS On Bypass
a. Verify the bypass line is green. If it is not,
contact your factory-authorized service
provider immediately and prepare to shut
down the load.
b. If external Maintenance Bypass is available,
close the Maintenance Bypass Breaker
(MBB) to place the load on Maintenance
Bypass. Do not attempt to re-transfer to UPS
without first contacting your factory-
authorized service provider.
c. If external Maintenance Bypass is not
available, but the CB3 option is visible on the
One-Line Display, close CB3. Do not
attempt to re-transfer to UPS without first
contacting your factory-authorized service
provider.
3. UPS On Battery
a. Verify the bypass line is green. If it is not,
contact your factory-authorized service
provider immediately and prepare to shut
down the load.
b. If the bypass line is green, press "Transfer",
"Bypass", to transfer the load to bypass.
c. If there is a CB3 present on the One-Line
Display, close CB3. If CB3 is not present
and external Maintenance Bypass is
available, close the MBB to place the load
on Maintenance Bypass. If both CB3 and
Maintenance Bypass are present, first close
CB3, then close the external MBB. If CB3 or
external Maintenance Bypass is not
available, shut down the UPS by pressing
"Shutdown", "UPS" and contact your factory-
authorized service provider.
Table 7 Liebert NXL alarm and status messages (continued)
Event Message Event Definition Recommended Action