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Control Interface
The PSU is controlled by an external module through its control
interface. The PSU provides the control interface signals on a flying
ribbon cable terminated by a flush-mounted 26-way IDC connector.
The control interface signals are:
Signal
Power Up:
Shutdown:
DC good:
ACvolts:
Battery voltage monitor:
Circuit breaker sense
AC current monitor
DC current monitor
Thermal alarm
-12V (DC output 6)
5V (DC output 7)
15A Latch
Battery charge monitor
AC good
0V
Power On Input
In Standby (with AC input present), connecting this input to 0V until the
PSU asserts DC Good will power up the PSU. The input will be held for
a maximum of 1 second. If DC Good fails to become asserted, then the
outputs DC0-6 are considered to have failed. When the PSU is in Backup
mode with 15A Latch active, connecting this input to 0V causes the PSU
to revert to AC Power. If AC current is still greater then 15A the 15A
T e c h n i c a l I n f o r m a t i o n
Function
Turns on DC0-6 outputs. Also used to clear
15A Latch.
Turns off DC0-6 outputs.
Digital output indicates that the DC0-4 output
rails are within spec.
Analogue output allows monitoring of the AC
line input voltage.
Analogue output allows monitoring of the lead-
acid battery voltage.
Digital output allows the System Management
Unit to sense the circuit breaker position.
Analogue output allows the System
Management Unit to sense the PSU AC line
current.
Analogue output allows the System
Management Unit to sense the PSU DC battery
current.
Digital output from PSU used to detect cooling
failure.
DC power for the System Management Unit.
Standby DC power for the System
Management Unit.
Digital output indicates PSU is in 15A Latch
mode due to the AC line input current
exceeding 15A.
Combined output, when below 2.5V is
proportional to battery charge current, when
above 3.1V indicates battery or charger failure.
Digital output indicates when true that the AC
input voltage is suitable and that the PSU is
currently powered by the AC input only.
Reference for the control interface.
OWNER'S HANDBOOK 5-51
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