T e c h n i c a l I n f o r m a t i o n
OWNER’S HANDBOOK 5-51
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
Function
Power Up:
Turns on DC0-6 outputs. Also used to clear
15A Latch.
Shutdown:
Turns off DC0-6 outputs.
DC good:
Digital output indicates that the DC0-4 output
rails are within spec.
ACvolts:
Analogue output allows monitoring of the AC
line input voltage.
Battery voltage monitor:
Analogue output allows monitoring of the lead-
acid battery voltage.
Circuit breaker sense
Digital output allows the System Management
Unit to sense the circuit breaker position.
AC current monitor
Analogue output allows the System
Management Unit to sense the PSU AC line
current.
DC current monitor
Analogue output allows the System
Management Unit to sense the PSU DC battery
current.
Thermal alarm
Digital output from PSU used to detect cooling
failure.
-12V (DC output 6)
DC power for the System Management Unit.
5V (DC output 7)
Standby DC power for the System
Management Unit.
15A Latch
Digital output indicates PSU is in 15A Latch
mode due to the AC line input current
exceeding 15A.
Battery charge monitor
Combined output, when below 2.5V is
proportional to battery charge current, when
above 3.1V indicates battery or charger failure.
AC good
Digital output indicates when true that the AC
input voltage is suitable and that the PSU is
currently powered by the AC input only.
0V
Reference for the control interface.
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
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