Backup Battery; Backup Battery Charging Procedure - Motorola DIMETRA MTS 4 Installation, Configuration, And Service Manual

Applicant: Motorola Solutions
• 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.
• 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.

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 75
Note: 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.

Backup Battery Charging Procedure

Note: Selected Operation Mode: AC Operation
The backup battery charging output voltage is 40.5VDC to 57VDC and output current 0 to 6A.
A temperature sensor monitors the backup battery temperature to ensure optimum charging.
Available charge current is reduced linearly with increasing temperature from 6A to 0A when the PSU input air
temperature increases from +30 °C to +60 °C
Note: 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.
and Interconnection and Internal Cabling on page 135
Equipment Type: ABZ89FC5827 / 109AB-5827
Power Supply Unit | 297
for more information.
6802800U74-AD | September 2014 | Send Feedback
Exhibit D2