Activation Time
Activation Time refers to the duration an output remains active during a Momentary On event in access control and security systems. This parameter determines how long a door strike, relay, or other controlled device stays energized after receiving a trigger signal. Understanding activation time is essential for balancing security requirements with operational convenience.
How Activation Time Works in Access Control Systems
When a user presents valid credentials at an access point—whether a key card, PIN, or biometric scan—the access control system triggers a Momentary On event. During this event, the connected output (typically an electric strike or magnetic lock) activates for a predetermined period. This period is the activation time.
Consider a typical office entry scenario: an employee badges into a secured door. The system verifies credentials and sends a signal to the electric strike. If the activation time is set to five seconds, the strike remains unlocked for exactly that duration before automatically re-engaging. The employee must open the door within this window or badge again.
Key Components Involved
- Controller: The brain that processes credentials and manages timing parameters
- Output relay: The switch that energizes or de-energizes the locking hardware
- Locking device: Electric strikes, magnetic locks, or electrified hardware that physically secures the door
Most modern access control panels allow administrators to configure activation time through software interfaces, typically adjustable from fractions of a second to several minutes depending on the application.
Configuring Activation Time for Different Scenarios
Proper configuration requires balancing security exposure against user experience. Shorter activation times reduce the window during which unauthorized individuals might slip through, while longer times accommodate users who need extra time to enter.
Recommended Settings by Application
| Application | Typical Activation Time | Rationale |
|---|---|---|
| Standard office door | 3-5 seconds | Sufficient for able-bodied users; minimizes tailgating risk |
| ADA-compliant entrance | 8-15 seconds | Accommodates users with mobility devices or disabilities |
| Loading dock gates | 30-60 seconds | Allows vehicle passage and maneuvering |
| High-security areas | 2-3 seconds | Minimizes exposure window; often paired with mantraps |
Testing configured times under real-world conditions helps identify adjustments needed. A setting that works perfectly in commissioning may prove inadequate when users carry packages or navigate with assistive devices.
Risks and Limitations of Activation Time Settings
Improperly configured activation time creates vulnerabilities that undermine physical security investments. Understanding these risks helps security professionals make informed decisions.
Common Pitfalls
- Excessively long activation times: Each additional second the lock remains disengaged increases opportunity for unauthorized entry through tailgating or piggybacking
- Too-short activation times: Users may prop doors open or defeat security measures when legitimate access becomes frustrating
- Inconsistent settings across similar doors: Users develop expectations; unexpected variations cause confusion and complaints
One frequently overlooked issue involves integration with door position sensors. Without a sensor confirming the door has opened and closed, the system cannot distinguish between a used unlock event and one that expired unused. Adding door contacts enables the system to re-lock immediately upon door closure rather than waiting for the full activation time to elapse—significantly improving security posture.
Activation Time in Fire and Life Safety Integration
Access control systems must integrate properly with fire alarm and life safety systems, making activation time configuration a compliance consideration beyond mere convenience.
During fire alarm activation, doors on egress paths typically unlock to allow evacuation. However, this behavior depends on the lock type and local fire codes. Fail-safe locks (which unlock when power is removed) release automatically during emergencies. Fail-secure locks maintain their locked state and require explicit programming to release on alarm.
Integration Considerations
The activation time parameter may need overrides for emergency scenarios. For instance, a door that normally unlocks for five seconds might need to remain unlocked indefinitely during a fire alarm until the system receives an all-clear signal. Security integrators should document these override behaviors clearly and test them during commissioning.
Building codes in many jurisdictions mandate specific requirements for egress timing. Consulting with the authority having jurisdiction (AHJ) during system design prevents costly retrofits and compliance failures during inspections.
Frequently Asked Questions About Activation Time
Can activation time be changed remotely?
Most networked access control systems allow administrators to modify activation time through management software without visiting the door. This capability proves valuable when adjusting settings across multiple locations or responding to changed operational needs.
What happens if someone holds the door open beyond the activation time?
The output relay de-energizes after the activation time expires regardless of door position. If a door position sensor is installed, the system can generate a "door held open" alarm. Without a sensor, the system has no awareness of whether the door actually opened.
Does activation time affect battery backup duration?
Longer activation times draw more power from battery backup systems during outages. Facilities relying on backup power should factor typical door usage patterns into their battery sizing calculations to ensure adequate runtime during extended outages.