Installation
The master relay is connected between the positive terminal of the battery
and the rest of the vehicles positive power supply. See the diagram on the
reverse for a typical installation. For more detailed installation instructions
please refer to the User’s Manual available online.
ENSURE THAT THE GROUND CONNECTION IS MADE BEFORE
CONNECTING THE BATTERY AND OUTPUT TERMINALS.
Switch Connection
The Master Relay has two separate switched inputs, the driver switch and
the external switch. The driver switch is the master switch and should be of
a latching type, such that when engaged the switch contacts are closed.
The external switch should have normally closed contacts and in the event
of a button press the contacts should become open. Multiple external
switches can be connected in series, please refer to the User’s Manual for
additional setup configuration.
LED Indicator States
Status LED Colour Status
Enumeration
Warnings
Bit Mask
Normal Green 1 -
Normal (CAN Error) /
Green Flashing
Over Temperature Warning /
Blue Flashing 2 0x01
Over Current Warning Yellow 3 0x02
Low Voltage Warning /
Green/Blue Flashing 4 0x04
High Voltage Warning /
Green/Red Flashing 5 0x08
Over Temperature Kill /
Blue/Red Flashing 6 0x10
Driver Switch Kill Red 7 0x20
External Switch Kill /
Red Flashing 8 0x40
CAN Trigger Kill Blue 9 0x80
Power On Reset Purple 10 -
PDM / ECU Connection
Pin 4 of the master relay connector provides a logical output for a PDM /
ECU allowing engine kill functionality with alternator load dump protection.
Default the drive of the output is an active high, half bridge. However, it can
be reconfigured for alternate applications, please refer to the User’s Manual
for further information.
CAN Bus
The Master Relay comes default with the following CAN configuration,
please refer to the User’s Manual if you need to alter the CAN baud rate or
address.
Baud Rate: 1Mbps Update Rate: 10Hz Byte Order: MSB First
Base Address (Default: 0x6E4)
Byte
Channel Units
Length Base
Signed Value Transmitted
0 Voltage Out V 2 0.01 Unsigned 12.56 1256
1
2 Current Load A 2 0.1 Signed 54.5 545
3
4 Internal Temperature °C 2 0.1 Signed 25.2 252
5
6 Warnings - 1 1 - see (2)
7 Status - 1 1 - see (1)
Base Address + 1 (Default: 0x6E5)
Byte
Channel Units
Length Base
Signed Value Transmitted
0 Voltage In V 2 0.01 Unsigned 12.56 1256
1
2 Serial No. - 2 1 Unsigned - -
3
4 Configuration - 2 1 Unsigned - -
5
6 Time Since Shutdown s 1 0.1 - 15.5 155
7 Shutdown Cause - 1 1 - see (1)
(1)
List of Status enumerations are available in the table on the opposite page
(2) Warning bit masks are available in the table on the opposite page
