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19
2.3.5.7.1 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 7Ω including the internal
resistance of the actuators.
Up to 4 igniting
actuators in series
M
M
M
M
2.3.5.7.2 Solenoid Actuators
A Back-EMF diode must be fitted across the
solenoid coil. Observe polarity
– see diagram
opposite.
Coil resistance 25
Ω-200Ω.
Maximum line impedance 1.5Ω -5.0Ω depending
on coil impedance
– see calculation below.
Two solenoids can be connected in parallel. The
panel will learn the combined circuit impedance
and will indicate an open circuit condition if one of
the actuators becomes disconnected.
SOLENOID
MIN 30Ω
DIODE 1N4004 or
equivalent
2.3.5.7.3 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 0.036Ω / metre
Cable Resistance (R
CABLE
) for 1.5mm
2
is
0.024Ω / metre
Cable Resistance (R
CABLE
) for 2.5mm
2
is 0.015Ω / metre
Insulation Resistance
(Core-Core and Core-
Screen)
2M Ω
2.3.5.8 USB
The USB socket is for connection to a Laptop or
PC.
This can be used for upload of a new logo or
download of the configuration and log files.
Refer to section 3.3.9 for further information.
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