10
OP
ER
AT
ION
Remote Switching Input
The SPCi has a special isolation feature which allows the unit to be remotely turned on/off by using
a simple (N/O) switch to isolate the output. The switch can be in the form of any normally open (N/O)
latching device i.e. toggle, ignition, push-button, etc.
The remote isolation circuit is activated by using the R terminal as the input signal. This circuit is
switched via any 8-32VDC source that is independent of the output side of the SPCi. For example the
feed can be connected directly to the +24VDC input terminal of the SPCi or from a remote source more
conveniently located to the control switch if desired. This control feature can be utilised in different ways
including the following:
• For safety or convenience purposes it is quite often necessary, for example, to isolate all equipment
when the ignition is turned off in a vehicle. In this instance any equipment connected to the 24VDC
output of the SPCi is immediately disconnected when the ignition switch is turned off and the key
removed.
• The SPCi can be used as a fully automatic switching device where there is a requirement to switch
24VDC equipment via a 24VDC source. For example, a fl oat switch or daylight switch can be connected
via the remote input terminal and used to switch the output of the SPCi on or off automatically.
The Remote input requires a trigger voltage of 8-32VDC to activate the internal control circuit. This is
signal current (<5mA) only so the terminal can be wired with extra low power control or data cable.
NOTE: In the event the Remote (R) terminal is connected, the SPCi will memorise the connection, even
if the input supply is disconnected. This is a requirement in order for the function to operate correctly.
Should it be necessary to discontinue the use of this function, a full system reset will need to be
performed. Isolate the 24V input to the SPCi. Remove the wire connected to the Remote (R) terminal.
Re-apply the 24V supply – the POWER Icon
does not illuminate. Press and hold the SET button
until the POWER icon illuminates (this will take approximately 1 minute). The SPCi is now operational
and in standby mode again.
12
SCHE
M
AT
IC
S
POWER CONDITIONER
Parallel Installation
Output voltage setting MUST be the same for each unit connected in parallel.
INPUT
AUX.
+24V –0V
R
A
+24V
-0V
OUTPUT
INPUT
AUX.
+24V –0V
R
A
+24V
-0V
OUTPUT
+
–
+
–
12V
12V
FUSE
FUSE
24V nominal
24V DC EQUIPMENT
11
SCHE
M
AT
IC
S
POWER CONDITIONER
Standard Installation
INPUT
AUX.
+24V –0V
R
A
+24V
-0V
OUTPUT
+
–
+
–
12V
24V DC EQUIPMENT
12V
FUSE
24V nominal
SCHEMATICS
13
SCHE
M
AT
IC
S
BATTERY CHARGER
Standard Installation
INPUT
AUX.
+24V –0V
R
A
+24V
-0V
OUTPUT
+
–
+
–
12V
12V
FUSE
24V nominal
+
–
+
–
12V
12V
