3: Ac Fail Delay/Aux. Trouble Relay Function; 4: Input/Output Function - Honeywell HPF24S8 Installation Manual

Programmable Features Description
Important! In Slave Mode, if the Input is active, but no signal is present on the Sync Input circuit,
the power supply will turn the NACs on steady until a sync signal appears. The NACs will turn off
when the Input becomes inactive.
Also in Slave Mode, if the Input is active and the Sync Input is suddenly lost (HPF24S or wiring
failure), there will be a three second period in which the NAC outputs are indeterminate. After this
three second period, the power supply will turn the NACs on steady until the Input becomes
inactive.
3.2.3 AC Fail Delay/Aux. Trouble Relay Function
The AC Fail Delay feature provides the option to delay generation of a trouble signal upon the loss
of AC power. In addition, the operation of the Aux. Trouble Relay is altered.
• DIP switch 4 set to the ON position will delay the generation of an AC Loss/brownout trouble
signal for 2 hours. In addition, the Aux. Trouble Relay will immediately respond to all trouble
conditions on the power supply.
• DIP switch 4 set to the OFF position will allow the HPF24S to generate a trouble signal
immediately on the loss of AC power. In addition, the Aux. Trouble Relay will respond only
to AC power fail/brownout conditions.
Refer to Section 4.1.2, "Supervision of HPF24S Faults", on page 25 for operation of internal NAC
trouble relay in response to AC loss.
3.2.4 Input/Output Function
DIP switches 5 and 6 are used to determine the Input Control circuits that will activate the four
output circuits and the function of the output circuits. For example, to configure a General Alarm
operation in which Input Control Circuit #1 activates all four output NACs, DIP switches 5 and 6
are both set to the OFF position. In this configuration, the Sync Input circuit is ignored if the power
supply is set as a Master but will be monitored if the supply is set as a Slave. In addition, if the
Auxiliary Power output is set as a resettable output, the circuit connected to Control Input Circuit
#2 will control the auxiliary power reset function.
HPF24S Series Power Supplies — P/N 52751:D3 5/11/2010
Programming Options
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