12
Supply voltage
Instruction book, IQAN
Supply voltage
Before any installation of the IQAN system can take place, make sure the ignition lock
is turned off and the battery is disconnected.
Emergency stop
Make sure an
Emergency Stop
disconnecting the power supply, is easily accessible at
any time. The figure below shows how to connect the emergency stop.
Connecting of Supply Voltage
The supply voltage, should be within the operating interval, see Appendix A. Connect
the supply voltage to +BAT and -BAT. Protect the module by using a fuse. For requisite
fuse level, see Appendix A.
RTC supply
IQAN master modules have a clock that is used for date/time stamping when logging
data. The
real time clock,
+RTC, requires a separate positive power connection.
Connect the supply voltage to +RTC through a 1.5K ohm resistor. The resistor should
be as close to the battery as possible for safety. Expansion modules do not have +RTC.
W
ARNING
Risk of injury!
To reduce the risk for uncontrolled supply of an IQAN master module, i.e., a short
circuit between the +RTC cable and +BAT, a resistor must be connected between the
battery and the +RTC input. This is important as this line is not controlled by an
emergency stop.
The resistor should be placed close to the battery, as the ’protected’ part is the cable
between the resistor and the unit.
This will prevent the +RTC wire from powering up the unit if shorted to +BAT. The
same possibility exists from a short to CRET wires when they are used as digital inputs;
refer to section "DIN that share pin with RET".
Connecting the emergency stop and voltage supply.
N
OTICE
Do not use the chassis as the negative terminal.
Polarity reversal
The module is protected against power supply polarity reversal and over-voltage,
provided an external fuse is being used.
If this fuse is not used, polarity reversal can damage the unit.
+
-
Emergency Stop
+BAT
Fuse
-BAT
*
* Symbol for disconnecting
switch for battery, ignition
lock and other fuses.
+RTC (if master unit)
IQAN module
1.5 k