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2.3.4.7 Actuator Output Circuit
The actuator output can be used to drive both
igniting (metron) style and solenoid style
actuators.
18.0 – 28.0 V DC, 1.0A
4
SUPERVISED. POWER LIMITED.
The circuit is monitored for both open and short
circuit conditions.
The output can supply a continuous 1A current for
solenoid style actuators or can provide a 3A
(15mS) pulse for igniting style actuators.
Output type is configurable - refer to Programming
section.
HO LD
BORT Pressure
Monitor
V
L
V
E
Mo
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i
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o
r
F
L
O
W
M
o
n
i
t
o
r
c
t
u
a
t
or
O
u
t
p
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PROG
Input-1
PROG
Input-2
2.3.4.7.1 Igniting Actuators
The circuit is current limited and one to four
igniting actuators can be wired in series without
special requirements.
No additional resistance is required in the circuit
Maximum line impedance 7 including the internal
resistance of the actuators.
Up to 4 igniting
actuators in series
M M M M
2.3.4.7.2 Solenoid Actuators
A Back-EMF diode must be fitted across the
solenoid coil. Observe polarity – see diagram
opposite.
Coil resistance 25-200.
Maximum line impedance 1.5 -5.0 depending
on coil impedance – see calculation below.
SOLENOID
MIN 30
DIODE 1N4004 or
equivalent
2.3.4.7.3 Solenoid Actuator Circuit Lengths
The voltage drop on the actuator circuit should be calculated to ensure that the minimum voltage
at the end of the circuit exceeds the minimum required by the solenoid (typically 18V) at the
minimum actuator circuit output voltage.
The voltage at the end of the circuit is given by:
Minimum Actuator Voltage = V
OUT(MIN)
– (I
ACTUATOR
x R
CABLE
)
Minimum Output Voltage (V
OUT(MIN)
) is V
BAT(MIN)
– 1.5V = 19.5V
Actuator Current (I
ACTUATOR
) is the sum of the loads presented by the actuator devices.
Cable Resistance (R
CABLE
) is the sum of the cable resistance in both cores x cable length.
Cable Resistance (R
CABLE
) for 1.0mm
2
is 0.036 / metre
Cable Resistance (R
CABLE
) for 1.5mm
2
is 0.024 / metre
Cable Resistance (R
CABLE
) for 2.5mm
2
is 0.015 / metre
Insulation Resistance
(Core-Core and Core-
Screen)
]2M
4
TOTAL OUTPUT LOAD (continuous) must not exceed panel supply rating – maximum 2A.
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