SK-PS Series Instruction Manual — P/N LS10227-002SK-E:C 2/2/2022 9
Open/Short/Ground Fault Trip Values in Standby System Overview
• Wire size: #12-14 AWG wire with 600V insulation
Command Input Circuits - TB5, TB6, TB7
• Trigger Input Voltage: 9 - 32 VDC
• Input Current Draw in Alarm Polarity: 9 - 32 volts, 14.0 mA maximum per input
Output Circuits - TB8-TB14
• Supervised and power-limited
• Voltage Rating: 24 VDC filtered
• Current:
– SK-PS6: TB8-TB9 – 1A Regulated, 3A special applications; TB10-TB12 – 0.3A Regulated, 3A special applications (Regulated
power is for industrial horn, strobes, and chimes not included in the Device Compatibility Document. Special application power is
for NAC devices included in Device Compatibility Document, aux power, and door holders.)
– SK-PS10: TB8-TB11 – 1.5A Regulated, 3A special applications; TB12-TB14 – 0.3A Regulated, 3A special applications (Regulated
power is for industrial horn, strobes, and chimes not included in the Device Compatibility Document. Special application power is
for NAC devices included in Device Compatibility Document, aux power, and door holders.)
– Maximum total alarm current for all output:
SK-PS6 - 6.0 amps
SK-PS10 - 10.0 amps
• Output Circuit Types:
– Class B NACs (require 2kΩ - 27kΩ End-of-Line Resistors) and/or Class A NACs using the optional ZNAC-PS Class A converter
module. Use Listed ELRs supplied by the FACP or compatible equipment manufacturer.
– Resettable or non-resettable outputs for 24 VDC power outputs or Class D door holder (max ripple voltage: 780mV
RMS
)
• Refer to the Silent Knight Device Compatibility Document #52612 for listed compatible devices.
• For wiring requirements, refer to “Wire Requirements” on page 42.
Trouble and AC Loss Relay Contact Rating - TB1-TB2
• Fail-safe Form-C relay (normally energized, transfers with loss of power)
• 4.0 amps @ 30 VDC resistive
Secondary Power (battery) Charging Circuit - TB15
• Supervised, non-power-limited
• Supports lead acid type batteries only
• Float Charge Voltage: 27.6 VDC
• Maximum Peak Charge Current: 2.47A
• Maximum Nominal Charge Current: 1.5 A
• Maximum Battery Capacity: 33.0 AH (with onboard battery charger)
• Minimum Battery Capacity: 7.0 AH
1.4 Open/Short/Ground Fault Trip Values in Standby
Table 1.1 lists the earth fault resistance detection in standby for each applicable terminal on the FACP.
NOTE: The SK-PS only supports 7AH or 18AH batteries in the cabinet. Other battery capacities up to 33AH will not fit in the cabinet due to
physical dimensions and require a separate battery cabinet.
Output Circuit Terminal Trip Resistance (in ohms)
NAC 1-5/7 + 9.9K or lower
NAC 1-5/7 - 9.2K or lower
ZNAC-PS 1-5/7 + 9.9K or lower
ZNAC-PS 1-5/7 - 9K or lower
Table 1.1 Earth Fault Trip Values
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