F3200/NDU AS4428.1 Installation Manual
Document No: LT0255
Applications
Page 6-14
5 July 2016
Issue 1.22
NOTES (CONTINUED)
7.
See Section 6.2.4 re use of actuators.
8.
Solenoids are typically less than 400 Ohms and require a diode (of sufficient rating)
to be wired in series at the solenoid to allow supervision. If two solenoids are
connected in parallel on one circuit the supervision will not detect one being
disconnected. Where multiple release circuits are diode connected (+ve & -ve legs)
onto a common solenoid, the supervision will detect shorts, but not all opens.
9.
If a Lock-off valve is not required, then Z7 is not required and can be left out of the
equations (standard programming of FP0876 and FP0877). Note that AS4214
requires the Lock-off Valve to isolate both poles of the Gas Release solenoid /
actuator. This is not done within the standard wiring and therefore needs to be done
externally with microswitches (or a relay).
10.
The standard LCS Gas Start switch automatically turns on when the glass is broken.
Some customers may require a different switch that can be turned off after the glass
is broken, and hence cancel the timer and prevent gas release.
11.
Enable supervision on Relay 2 if using a 3-wire connection to the Alert/Evacuate
warning signs.
6.2.4
USE OF ACTUATORS
Where a CV-98 actuator is used it must be connected in series with the 427354 current
regulator, fitted at the furthest point to act as the EOL.
A single actuator should be connected in reverse, i.e. with the black wire to the inve
voltage, so that the supervision can detect that the element has been fired. See Figure
6.2.2(a).
Multiple actuators may be connected in series on one circuit, but each
must
have the red
wire to the inve voltage. See Figure 6.2.2(b). Note the F3200 supervision cannot
detect the difference between an unfired element (<2 Ohm) and a fired one. The actuator
has 3 series forward diodes across the element so that current will continue to flow through it
after the element has fired. With F3200 if both actuators fire, a supervision fault may or may
not be generated.
Where series resistors have been used (in existing circuits) to limit the current, a series
diode must be fitted as the EOL. It must be a silicon diode (not Schottky) rated at 2Adc or
higher, e.g. 1N5404. See Fig 6.2.2(c). The series resistor(s) must be located in the F3200
panel.
The maximum number of actuators connected in series in one circuit appears to be quoted
by the manufacturer as 2. The following estimates for the Metron Protractor and 427354
current limiter (not confirmed by the manufacturer, consult the manufacturer) suggest that up
to 4 actuators may be fitted to a circuit with a current regulator and up to 4 Ohms cable
resistance.
Allow: 21V as worst case battery voltage; 6.5V drop for regulator; 2.5V drop per actuator; 1V
per Ohm of cable resistance.
The Ansul HF Electric Actuator (PN 73327) can be used on the F3200. Two devices can be
wired in series directly off the F3200 solenoid output, but if using just one device, a 21
Ω
resistor (Ansul PN 73606) must be wired in series with the Actuator. In both cases a suitable
diode (e.g., 1N5404) must be wired in series (fit at the actuator) to provide short circuit
detection. Refer Figure 6.2.2D.
