Lenze MCH Series Drives Metasys N2 - Manual (Page 8)

5 RG-MHMET
Drive Setup & Programming
60 SERIAL TIMEOUT This parameter makes the serial watchdog timeout period selectable. It has a
minimum value of 10 seconds and maximum value of 1800 seconds. The default
value is 120 seconds. If no action is to be taken when a serial watchdog timeout
occurs, Drive Parameter #57 (Serial) should be set to W/O TIMER. This will disable
the watchdog timer. Otherwise Drive Parameter #57 (Serial) should be set to WITH
TIMER and if the drive is running in AUTO HOA, it will trip into a SERIAL FAULT
when the watchdog timeout occurs, stopping the drive.
When a watchdog timeout occurs in AUTO HOA, the drive is taken out of serial
control and any overrides that were in effect are released.
3.2 Communication Overrides
Overrides are also released under the following circumstances:
• Drive Parameter #57 (Serial) is set to DISABLED.
• Drive Parameter #58 (Serial Address) is changed.
• Drive Parameter #30 (Control) is changed.
• Drive Parameter #65 (Program) is changed to RESET 60 or REST 50 (i.e., a factory reset is
performed) and Drive Parameter #58 (Serial Address) was not previously set to 30. In this case,
serial communications will be terminated immediately.
• Drive Parameter #65 (Program) is changed to RESET 60 or REST 50 (i.e., a factory reset is
performed) and Drive Parameter #30 (Control) was not previously set to NORMAL.
• The drive HOA is changed from AUTO to either HAND or OFF.
In the above circumstances, if the drive is running in AUTO HOA and control parameters are unlocked, then
the drive will be brought to a STOP. The resulting stop condition will depend on the setting Drive Parameter
#30 (Control):
• KSTOP for settings of NORMAL, NORM NO HAND, SERIAL SPEED, and S SPD/NO HAND. A
keypad AUTO or HAND START are required to restart the drive.
• SSTOP for settings of SERIAL AUTO and S AUTO/NO HND. A serial start command is required
to restart the drive.
NOTE - Drive Stop unrelated to Serial Communication
The drive will also be brought to a stop if Drive Parameter #49 (TB13C Input) is changed to or from HAND
(i.e., the HOA is changed from LOCAL to REMOTE or from REMOTE to LOCAL). The specific stop condition
will be dictated by the setting of Drive Parameter #30 (Control).