CAN Control
If you are using the PDU-8 module with an AEM VCU then no specific CAN setup is required. Refer to the
VCU instructions to activate the PDU within the control strategy used by the VCU.
If you are controlling the PDU-8 with a 3
rd
party device the following CAN control information will be needed.
A CAN DBC file is available from AEM to aid in entering the CAN setup.
The PDU-8 will continuously transmit 2 messages at 20hz containing the current status of the 8 channels.
Tx Message 1 is for Channels 1 to 4, Tx Message 2 is for Channels 5 to 8.
PDMMeasuredCurrent0#
is an unsigned 10 bit number with a scale of 0.1A and an offset of 0 (0-102.3A).
Note that the individual channels are assumed to be used to drive high current loads, in some cases up to
20A per channel. The current measurement is designed for use above 2 amps and currents below this are
unreliable.
PDMErrorStatus0#
is a 3 bit unsigned number with a scale of 1 and an offset of 0 (0 to 7). The possible
values for the PDMErrorStatus0# are:
4 = Short Circuit
2 = Current Limit Exceeded
1 = Open Circuit
0 = OK
The Open Circuit detection only works when the channel is commanded off. Once the channel is turned on
the measured current should be used to identify errors.
PDU-8 Tx Message 1, 0x000A0610 (for unit 1) continuous transmit at 20 hz
6/9/2020 –
Document Number: 10-8300-EV
© 2020 AEM Performance Electronics
