VS-MKII Control System
Chubb Fire & Security Pty Ltd
Technical Manual
Page 21 of 63
d. Discharge delays
Immediate discharge gives the suppression system the best chance of suppressing the fire in its
early stages; however, in special circumstances delaying the discharge of the suppression system
may be desirable. To cater for such circumstances, (such as operator safety) a discharge delay timer
is provided with selectable delay periods - see Table 7. The default setting is 0 seconds.
The MKII is able to operate a solenoid or a squib detonator.
If the discharge delay is enabled, the actuation 1 delay time commences from when the first alarm is
registered.
MKII Dual
If using the MKII Dual model, the two actuation outputs cannot activate simultaneously. There will be
a time delay depending on the device that is in use (solenoid or squid). The time delay is necessary
to ensure that a solenoid or squib is energised long enough to allow the system to actuate.
•
Time delay for solenoid = 15 seconds
•
Time delay for squib = 1 second
When calculating the time delays for both actuation circuits it is important to take into consideration
the holding time for each type of actuation device (Fig. 32)
Figure 32 – MKII Dual actuation holding times
ON Holding
Time
Alarm
Actuation 1 Delay
Actuation 2 Delay
System
Alarm
Actuation 1
Output
Actuation 2
Output
ON Holding
Time
*Holding Time
•
Actuation 1 & Actuation 2 are enabled and configured to drive solenoids:
o
Delay on actuation 1 = ACT_1_DELAY
o
Delay on actuation 2 = ACT_1 15 s ACT_2_DELAY
•
Actuation 1 & Actuation 2 are enabled and configured to drive squibs:
o
Delay on actuation 1 = ACT_1_DELAY
o
Delay on actuation 2 = ACT_1 1 ACT_2_DELAY
•
Actuation 1 is disabled, actuation 2 is enabled:
o
Delay on actuation 2 = ACT_2_DELAY
