Users Manual Part 2

Unit Function
• 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 usa-
ble, 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 Bat-
tery: Bad DC supply is defined as a DC source where the volt-
age 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 auto-
matically 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 sup-
pressed.
• 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.
6802800U74-AP
Chapter 8: Site Controller
329