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Connecting Multiple Power Supplies
2.8 Connecting Multiple Power Supplies
2.8.1 Cascading Multiple Units
Up to four SK-PS power supplies can be cascaded together to provide additional NAC extenders for a system. Maintain separation of power-
limited and non-power-limited wiring as shown in Figure 2.6 on page 16.
Figures 2.11 and 2.12 show the controlling signal connected to Input 1 of SK-PS1. However, typically any available Input of SK-PS1 can be
used.
Figures 2.11 and 2.12 show NAC7 of SK-PS1 - SK-PS3 as the cascading output. However, any available Output of SK-PS1 – SK-PS3 can be
used.
NOTE: Any configuration that requires an additional control signal (i.e. a trigger signal), such as Selective Silence or Input #1 Sync
Configuration, will affect which Inputs may be available on PSE1 for use with cascading. (Triggers signals are usually assigned to Input 2.) Refer
to those sections of the manual for specifics.
TB4
NO NC C
NO NC C NO NC C
TB15
SK-PS4
SK-PS4
The following notes apply to Figure 2.11.
1.
Set all SK-PS units to Slave (sync follower) Configuration.
2.
The debounce/dejitter setting must be set to 1 msec on all cascaded units. See Table 3.3 on page 24.
3.
For NFPA 72 2019 compliance, notification appliances cannot be installed on the interconnecting FACP control circuits wired to the
SK-PS input circuits.
4.
The total line impedance for interconnected units cannot be such that it creates a voltage drop > 3.2 VDC.
5.
In Default mode, ground fault supervision is provided via the general trouble relay . For ground fault supervision in Retrofit mode, refer
to Table 5.1. Refer to Section 2.9 for different methods of ground fault monitoring for the power supply.
TB4
NO NC C NO NC C NO NC C
TB15
SK-PS4
Figure 2.12 System Sync Connections Triggered by Control Module - Cascade
The following notes apply to Figure 2.12.
1.
Set SK-PS1 to Master configuration, and the desired strobe/horn type. Set remaining SK-PS units to Slave (sync follower)
configuration.
2.
The debounce/dejitter setting must be set to 1 msec on units# SK-PS2 – SK-PS4. See Table 3.3 on page 24.
3.
Strobe/Horn devices connected to the SK-PS units are not guaranteed to be in sync with FACP devices when using this configuration
4.
For NFPA 72 2019 compliance, notification appliances cannot be installed on the interconnecting FACP control circuits wired to the
SK-PS input circuits.
5.
The total line impedance for interconnected units cannot be such that it creates a voltage drop > 3.2 VDC.
6.
In Default mode, ground fault supervision is provided via the general trouble relay . For ground fault supervision in Retrofit mode, refer
to Table 5.1. Refer to Section 2.9 for different methods of ground fault monitoring for the power supply.
SK-PS Series Instruction Manual — P/N LS10227-002SK-E:C 2/2/2022
TB4
NO NC C
NO NC C NO NC C
TB15
SK-PS3
Figure 2.11 System Sync Connections Triggered by FACP - Cascade
TB4
TB4
NO NC C NO NC C NO NC C
TB15
TB15
SK-PS3
TB4
NO NC C NO NC C NO NC C
TB15
SK-PS2
TB4
NO NC C NO NC C NO NC C
NO NC C NO NC C NO NC C
TB15
SK-PS2
TB4
NO NC C
NO NC C NO NC C
TB15
SK-PS1
Regulated
24VDC
UL864 listed
power supply
Control
Module
SK-PS1
Installation
NAC or remote
sync output
FACP
SLC
FACP
19
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