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•
Over Temperature: Indicating over temperature detected 5 °C to 10 °C before shutdown.
•
Fan 1 alarm: Fan 1 not operating (fan has stopped or its running speed is below specification), PSU
has received a high signal (open collector) from fan tray 1 through fan connector 1.
•
Fan 2 alarm: Fan 2 not operating (fan has stopped or its running speed is below specification), PSU
has received a high signal (open collector) from fan tray 2 through fan connector 2.
•
Fan 3 alarm: Fan 3 not operating (fan has stopped or its running speed is below specification), PSU
has received a high signal (open collector) from fan tray 3 through fan connector 3.
PSU Controls available through CAN Bus:
•
FORCE DC: Controls the PSU to force the usage of the DC input if usable, disregard presence of
AC. If DC is outside the usable range for the PSU, the PSU shall indicate an alarm using the DC-fail
output. If DC input voltage comes below 43 V ±2% and if AC is usable the PSU shall take the input
power from AC, disregarding a Force-DC control input.
NOTICE: Force DC operation on a bad DC supply PSU or Battery: Bad DC supply is defined
as a DC source where the voltage drops below 43 V for a few milliseconds when the PSU is
forced to operate on DC. In case of a force DC command and bad DC supply the 28.5 V
output voltage is allowed to drop down to 27 V for a maximum of 5 second, while the PSU
automatically switches back to AC mode and the 28.5 V rises from 27 V to 28.5 V. During
this sequence the DC out alarm is suppressed.
•
Fan supply output voltage is also controlled by the CAN Bus in 5 steps from 24 V to 12 V. The
highest value is set by CAN Bus or automatically.
•
DC operation only: Prevents AC fail alarms (and associated LED) from the PSU on CAN Bus when
the PSU is supplied from DC only. If the AC supply becomes present during DC operation, the AC
Source Fail alarm circuit is automatically be reactivated.
•
AC operation only: Prevents DC fail alarms (and associated LED) from the PSU on CAN Bus when
the PSU is supplied from AC only. If the DC supply becomes present during AC operation, the DC-
Fail alarm circuit is automatically reactivated.
•
No Fan 1: Prevents Fan 1 alarm (and associated LED) when no fan 1 is connected. If the Fan1
becomes present during operation, the Fan1 alarm circuit is automatically reactivated.
•
No Fan 2: Prevents Fan 2 alarm (and associated LED) when no fan 2 is connected. If the Fan2
becomes present during operation, the Fan2 alarm circuit is automatically reactivated.
•
No Fan 3: Prevents Fan 3 alarm (and associated LED) when no fan 3 is connected. If the Fan3
becomes present during operation, the Fan3 alarm circuit is automatically reactivated.
•
Fan Factor: Fan factor is used to determine automatically calculated Fan supply voltage - the higher
factor is specified the higher voltage is calculated. The Fan Factor range is 0.5 - 2.0 (by default 1.0).
In systems with only one BR this factor is typically set to 1.0.
See the MMI Commands manual for additional information on commands and parameters.
11.1.2
Backup Battery
The Power Supply Unit (PSU) handles the automatic switchover to a backup battery in the event of AC
power supply failure. The MTS charges a backup battery during normal AC operation. The backup
battery normally is located near to the cabinet.
This battery is connected to the DC connector on the front panel of the PSU through Junction Panel.
Refer to
Hardware Installation on page 86
more information.
NOTICE: The recommended batteries to be used are a Valve Regulated Lead Acid (VRLA)
recombination type, with -48 VDC nominal. Such as Enersys Power safe VFT type.
and
Interconnection and Internal Cabling on page 149
6802800U74-AN
Chapter 11: Power Supply Unit
for
331
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Troubleshooting
