Owner`s manual

VANNER Incorporated OWNER’S MANUAL
PMEC-12/24 OWNER‟S MANUAL
8
Saving of Battery Data at Power Down
An unmaskable external interrupt will be triggered when the ignition signal to the PMEC drops below
9V. In this interrupt service routine, all PMEC/battery parameters and battery status information is
saved into non-volatile memory – FRAM. The saved data is read out at power up and used to
continue battery monitoring. By doing this, the battery monitor can always start from the previous
state instead of restarting from the default state.
In case the saved data is corrupted for any reason, software will load default values and start from the
default state.
Factory reset sets all parameters and battery state data to their default values.
CAUTION: Do not reset IdleWATCH™ parameters to factory defaults while the truck is running or
the batteries are discharged. Inaccuracies in battery states will be introduced that will adversely
affect system performance.
CAN Communication
J1939 CAN communication is supported by the PMEC. The following CAN messages are handled;
Heartbeat
PMEC status
Battery voltage and current
Load current
Battery status
Read and set PMEC/battery parameters
DM1 messages
Data logging
CAN bootloader
Please refer to the Vanner PMEC CAN Specification for details.
Data Logging
Battery and PMEC status information can be logged in two RAM chips (if populated) at a user-
specified rate. The logged data will be lost if the ignition signal to the PMEC is turned off but it can be
read out before that via CAN bus. The PMEC dashboard in the Vanner CAN Interface provides this
reading function.
The maximum number of records that can be logged and read is 16384. Battery and PMEC status
data can be displayed and saved to a text file via the PMEC dashboard. The text file can be imported
later into Microsoft Excel for analysis.
The user can specify the data logging speed (interval in seconds between two data records) and
length (number of data records to log). The logging speed can be chosen from 1 record per second to
1 record per hour. The corresponding logging interval is 1 through 3600 (seconds). The logging
length can be 1 through 16384. Data logging will stop when the specified number of records is
logged. The user can specify a length greater than 16384 to enable continuous data logging. Please
note that even in continuous mode, a maximum of 16384 data records can be logged into the RAM
chip. However, when this number is reached, new data will overwrite the old data to continue logging.
Short Circuit – Thermal – ESD (Electrostatic Discharge) – Overvoltage Protection
The PMEC utilizes smart FET power switching devices that have short circuit, over-temperature, ESD
and overvoltage protections built in.