HPF24S Series Power Supplies — P/N 52751:E1 4/14/2011 21
Programmable Features Description Programming Options
3.2 Programmable Features Description
3.2.1 Synchronization Type Selection
Synchronization is a feature that controls the activation of notification appliances in such a way that
all devices will turn on and off at exactly the same time. This is particularly critical when activat-
ing strobes which must be synchronized to avoid random activation and a potential hazard or con-
fusion. The HPF24S can be programmed to operate with a variety of manufacturer’s devices. Note
that strobe synchronization works only with non-coded NACs.
DIP switches 1 and 2 are used to select the type of synchronization as listed below:
Maximum Number of Strobes for Synchronization
The total current draw for each Notification Appliance Circuit cannot exceed 3.0 amps. Refer to
the manufacturer’s documentation supplied with the strobes to determine the maximum current
draw for each strobe and ensure that the circuit maximum is not exceeded.
To ensure proper strobe and circuit operation, there is also a limit to the number of strobes that can
be attached to each circuit. Following is a table of the strobes that have been tested with the power
supply and the maximum number that can be connected to each NAC when using the lowest can-
dela settings. Make sure that the NAC maximum current is not exceeded:
3.2.2 Synchronization Mode - Master/Slave
The HPF24S power supply can be configured for Master or Slave Synchronization by setting DIP
switch 3 ON for Slave or OFF for Master mode.
In some installations, it is necessary to synchronize the flash timing of all strobes in the system for
ADA compliance. Strobes accomplish this by monitoring very short timing pulses on the NAC
power which are created by an FACP with synchronization capability. When installed at the end of
a NAC wire run, this power supply can track (that is follow) the strobe synchronization timing
pulses on the existing NAC wire run. This maintains the overall system flash timing of the addi-
tional strobes attached to this power supply.
When this power supply is configured as a sync generator (Master Synchronization mode), the
Sync Input terminals are not used. The power supply is the originator of the strobe synchronization
pulses on its NAC outputs. In sync generator mode, the sync type (System Sensor, Wheelock, or
Gentex) is selectable via DIP switches 1 and 2.
When this power supply is configured as a sync follower (Slave Synchronization mode), the power
supply’s NAC outputs track the strobe synchronization pulses present at the supply’s Sync Input
terminals. The pulses originate from an upstream FACP or other power supply. Some FACPs pro-
vide synchronization timing pulses from a dedicated sync output connector. Connect the HPF24S
DIP Switch 1 DIP Switch 2 Synchronization Type
OFF OFF no synchronization (steady 24V)
OFF ON System Sensor
ON OFF Gentex
ON ON Wheelock
Table 3.2 Sync Type Settings
Strobe Manufacturer HPF24S6 (max. strobes) HPF24S8 (max. strobes)
System Sensor 51 51
Wheelock 30 40
Gentex 39 39
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