MoTeC PDM30 - Manual (Page 7)

4 Installation
Wiring
Other
Devices
PDM
A
M M
Switches
M
Motors
CAN Bus
Alternator
Lights
Starter
Motor
Outputs
Battery Input
Battery
CAN
Inputs
Isolator
Data Logger ECU
CAN Connector
for UTC
0 V
–
+
Keypad
Battery Positive
Battery positive is supplied to the PDM via the single pin connector to suit wire
sizes 16 mm
2
(6#) or 25 mm
2
(4#).
The PDM16 and PDM32 use an Autosport connector, PDM15 and PDM30
use a 6 mm eyelet to suit the wire size.
The wire gauge should be chosen according to the wire temperature limit and
acceptable voltage drop. Tefzel wire must not exceed 150 °C.
The temperature of the wire is affected by the ambient temperature, air
circulation, current, wire gauge, the temperature of any surrounding wires and
the covering sheath.
See Wire Specification and Connectors and Pinout for details.
Battery Isolator Switch
Battery positive must generally be connected via an isolator switch or relay.
The isolator must isolate the battery from all devices in the vehicle including
the PDM, starter motor and alternator. The isolator must be rated to handle
the starter motor current.
When the battery is isolated, the engine may continue to run due to power
supplied by the alternator. To avoid this, the isolator switch should have a
secondary switch that is connected to a shutdown input on the ECU.