Alarms (Warnings And Faults) - Siemens MICROMASTER 420 Operating Instructions Manual

Issue 01/05
7.2

Alarms (warnings and faults)

If faults/errors occur in the CANopen communications, the appropriate alarm or
fault number is output at the drive converter/drive inverter.
Warnings
Table 7-4 Warnings displayed at the drive converter
Alarm No. Description
A0700 Can Chip Passive Warning
Erroneous CAN messages are received or sent and the internal fault counter has exceeded 128.
Extra Information
The erroneous CAN messages are not used. Data which was last sent remains valid. If the erroneous
data is process data, depending on the telegram failure monitoring setting (P2040) , fault F0070 can be
initiated. There is no response in the Drive if the parameter access messages are erroneous. The red
error LED of the CANopen module is single flashing. This warning means that there are problems with
the communication through electrical noise or other problems. Note that the health of the link can be
determined by monitoring the number of message errors in the message error counter in r2054.06. See
description of r2054.06 for further information. The message error counter should only increment
occasionally. This warning will clear automatically when the number of error messages on the bus
reduces sufficiently.
Remedy:
•
Check and if required correct most significant digit of P2041.04 (baud rate)
for every bus node
•
check cable connection between bus nodes
•
check cable shielding
•
replace the CANopen module
A0701 CAN chip or CAN buffer overflow
Data has been received too quickly to be processed.
Extra Information
If the CAN chip buffer is full, or the software message buffers are full, then any further received
messages will be lost until the option module and drive have had time to process messages from the
buffers. The user has the option to ignore this warning, stop the drive, or to force a drive trip in response
to this condition. See note 2 for further information.
Remedy:
The cause of this error is that the bus loading is too high. Reduce the rate at which messages are sent
to the MICROMASTER 420/430/440. Allow at least 1ms between 2 consecutive messages to the
MICROMASTER 420/430/440. Note that within the drive CANopen module PDO message data is
transferred to the drive every 8 ms, so writing to the same location (i.e. writing the speed set point) more
often than every 8 ms will generally cause the earlier data to be overwritten. Note that PDO that write to
different objects may be sent more often than 8 ms.
CANopen Option Module Operating Instructions
6SE6400-5BC00-0BP0
Diagnostics and troubleshooting
115