Switched DC Power Hub

Compliance Note: Fire Alarm Integration

Under the National Building Code (NBC), access-controlled doors in egress paths must release automatically upon fire alarm activation to allow safe evacuation. The Switched DC Power Hub facilitates this mandatory fail-safe operation by dropping power to the locks when the fire alarm panel triggers.

Overview

The Switched DC Power Hub (P/N: 995916) is a critical life-safety integration module. Its primary purpose is to interface the access control system with a building’s fire alarm or emergency evacuation system. It provides four separately fused power outputs that can be globally switched off in response to a fire alarm signal, dropping power to fail-safe locks (like magnetic locks) to ensure unimpeded egress.

Technical Details

Power Specifications

• Input Voltage: 11V to 14V DC (provided by the host Smart Power Supply).
• Current Consumption: 95mA when the output is “On” (idle, no load).
• Output Capacity:
  • 4 independent output channels.
  • Max current per channel: < 2A (protected by 2A Fast Blow fuses: F1, F2, F3, F4).
  • Important: The total current drawn across all four outputs must not exceed the maximum capacity of the host power supply.

Output Types

Each of the 4 output channels provides two types of DC connections:

1. Unswitched (OUT): Provides constant 12V DC power (e.g., for powering readers or secure-side devices).
2. Switched (OUTSW): Drops power based on the state of the Control Input. Used for fail-safe locks.

Control Input

A single Control Input determines the state of all four OUTSW connections.

• Control Modes (LK2):
  • Contact: Triggered by voltage-free dry contacts from the Fire Panel.
  • 12V-24V: Triggered by the presence/absence of a DC voltage (Switching threshold: 2V).
• Active State (LK1): Configures whether the OUTSW is energized when the input is Short/0V or Open/12V-24V.

Feedback and Monitoring

• Relay Feedback (T7): Provides a relay output (Max 2A @ 30VDC) to signal the current state of the switched outputs back to the Integriti/Inception controller for monitoring and reporting.
• LED Indicators:
  • L1 (Output ON): Indicates the OUTSW terminals are energized.
  • L2-L5: Fuse blown indicators (only visible if a load is connected).

Board Layout

Terminal Pinouts

Power Input (T1)

Terminal	Label	Function	Connection Notes
T1	+12V / 0V	Power Input	Connect to host Power Supply output (e.g., Integriti 8A or 10A Smart PS). Extra terminals allow additional conductors for increased current capability.

Control Input (T2)

Terminal	Label	Function	Connection Notes
T2.1	CTRL	Control Input	Fire Panel Trigger (Contact or 12V-24V).
T2.2	0V	Input Common	Reference ground.

Feedback Relay (T7)

Terminal	Label	Function	Connection Notes
T7.1	C	Relay Common	Feedback to Controller (Max 2A @ 30V DC).
T7.2	NC	Relay N/C	Closed when Outputs are ON (Revision C).
T7.3	NO	Relay N/O	Open when Outputs are ON (Revision C).

NOTE

On Revision B PCBs (manufactured 2014-2016), the NC and NO terminals are swapped. Verify PCB revision before wiring.

DC Outputs (T3 - T6)

Terminal	Label	Function	Connection Notes
T(n).1	0V	Common (-)	Return path for locks/devices.
T(n).2	OUT	Unswitched DC (+)	Continuous 12V-14V DC (2A Fuse).
T(n).3	OUTSW	Switched DC (+)	Fail-Safe Lock Power (Switched by T2).

n = 3, 4, 5, 6 for Outputs 1 through 4 respectively.

Installation & Wiring

• Mounting: Can be installed in an Inner Range enclosure using PCB mounting clips.
• Lock Wiring:
  • Normally Energized (Fail-Safe): Wire locks to the OUTSW terminals. The control link must be configured so that a fire alarm event de-energizes this output.
  • Important: If the lock is inductive, clamp diodes (e.g., 1N4004) must be fitted at the lock.
• Host Connection: Typically powered directly from an Integriti 8A or 10A Smart Power Supply to handle the high current demands of multiple magnetic locks.

Related Pages

• IAC Reader Configuration
• Inception Door Configuration
• Wiring and Installation Best Practices