Users Manual

ALL

EFFECTIVITY

Page 4-46

22 Apr 2019

23-15-49

SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL

ASPIRE-400

B. Hold-Up Capacity / Power Interruption

(1) The PSU function provides a hardware indication to the Control Processor of "Power

Interruption" on the occurrence of end of transparency time.

(2) The HPA is functionally transparent to a power interrupt of at least 10 ms (transparency

time) target 30 ms. Where power interruption is defined as primary power not being

sensed within the range suitable for conversion purposes.

(3) The HPA has at least 300 ms of power interruption power supply hold-up capacity that is

capable of sustaining at least all secondary functionality and intercommunication

throughout that duration.

(4) When the transparency time has elapsed, the Control Processor may evoke power

conservation measures by disabling the PA function until such time as the PSU provides

notification to the Control Processor that recovery of primary power has occurred.

(5) If power conservation is implemented in response to a power interruption requiring the PA

function to be disabled then the inhibition of "power interruption exceeding the

transparency time" is identified while power conservation remains in force.

(6) When primary power restoration occur while power conservation is in effect, the software:

(a) Writes a momentary power interruption event to the Event Record.

(b) Terminates power conservation.

status.

(7) When primary power restoration occur before the hold-up capacity is exhausted then full

hardware capability reestablishes for the Operating State within 50 ms from the

restoration of normal operating voltage.

NOTE: Allocation is for GaN sequencing of drain voltage. Allocation does not include

regeneration time of hold-up capacity that continues after return to service

exists. Allocation assumes a power supply architecture that permits

immediate secondary generation from primary input power.

(8) When primary power restoration occur before the hold-up capacity is exhausted then full

restoration of hold-up capacity is established within 250 ms from the restoration of normal

operating voltage.

(9) For power interruption periods greater than the hold-up capacity the HPA may shut down

if necessary.

(10) Prior to electing to shut down the HPA for interruption greater than the hold-up capacity

the software latches the reset reason register to identify "Hold-Up capacity depleted".

This may be done pre- emptively when entering power conservation.

DRAFT

3rd rvw Draft as of:

29 January, 2020