Motorola DIMETRA MTS 2 Installation, Configuration And Basic Service Manual page 287

MTS 2 and MTS 4 Installation, Configuration and Basic Service Manual
Table 8-6 Site Controller - CAN Bus Functionality (Continued)
Unit
6802800U74-N September 2009
• PSU input air temp.: -30 °C to +100 °C, tolerance: 2 °C.
Alarms:
• DC Source Fail: Indicating DC input voltage outside limits (below 43 V).
• DC Out Fail: DC output voltages out of limits.
• AC Source Fail: Early warning, indicating that the AC input is interrupted
and the PSU starts to operate from DC input source in ≥ 15 ms. (if a backup
source is present).
• Software Fail: Indicating software is corrupted or unable to initialize.
• 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.
Controls:
• 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.
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.
Site Controller - CAN Bus
Function
8-11