Edwards SIGA-REL Technical

Chapter 1 Product design
18 SIGA-REL Technical Reference Manual
Manual release sequence
WARNING: You cannot abort the manual release sequence.
The operation of a manual release station initiates the manual release sequence.
Figure 6 explains the manual release sequence.
A manual release overrides all other operations and sequences, including all
modes of the abort function.
Figure 6: Manual release sequence
Release circuits
First alarm relay
Manual delay timer
Prerelease circuits
Selectable
manual delay time
(0 to 30 seconds)
[1] [3] [4]
Time line (see details below)
[2]
[1] An active manual release station disables automatic
operation and the abort function and simultaneously
activates the:
• Manual delay timer
• Strobe circuit (on steady)
• Horn circuit prerelease tone (60 pulses per minute)
[2] Ten seconds before the expiration of the manual delay
timer, the horn changes to the release tone (steady).
[3] The manual delay timer expires and the release circuits activate.
[4] A manual reset at the fire alarm control panel deactivates the release
solenoids and the Releasing Module returns to the normal state.