Lenze MCH Series Drives - Manual (Page 9)

RG-MHBAC 6
Drive Setup & Programming
NOTE
• Drive Parameter #30 (CONTROL) must be set to SERIAL AUTO or S AUTO/NO HND in order
to start the drive over the LAN.
• The upper left corner of the drive display must indicate SSTOP for a serial start command
to be accepted by the drive.
• If the display reads KSTOP (keypad stop) then the AUTO START or HAND START button
must be pressed to clear the keypad stop condition.
• If the display reads RSTOP (remote terminal stop) then there is an open external contact
that needs to be closed.
• If the drive is a standalone drive or has an option box, make sure that the TB1-to-
TB2 contact is being made.
• If the drive has a bypass, make sure that the drive is in AUTO H/O/A and that all
of the safety and customer start contacts are closed (specifically the B3-to-B4
contact which is not made when the drive leaves the factory).
56 SERIAL LOSS This parameter sets the action to be taken in the event that the Drive Parameter #30
(Control) is set to SERIAL SPEED and the LAN had modified the speed or setpoint
command prior to a serial watchdog timeout occurrence. The options for this
parameter are FAULT (default) and PRESET#3.
If FAULT is selected and the drive is running when a serial watchdog timeout occurs
the drive will trip into a SERIAL FAULT stopping the drive and taking it out of serial
control. A fault reset command (issued via the Clear Fault point), a keypad stop or a
terminal stop is required to clear the fault. A stop command from the LAN will also
clear the fault if it is the highest priority command in the priority array.
If PRESET#3 is selected, Drive Parameter #30 (Control) is set to SERIAL SPEED and
the drive is running when a timeout occurs, the drive will continue to run but will get
its speed command from Drive Parameter #3 (PRESET #3). If the drive is stopped
(KSTOP, RSTOP, SSTOP or FAULT), placed in HAND or OFF or serial communications
are restored, the drive will return to its normal speed/setpoint reference.
When Drive Parameter #30 (Control) is set to SERIAL SPEED, the speed reference
MUST be the drive keypad (-KEY, -MKB, -AKB or -SER) for the serial loss action to
take effect.
If Drive Parameter #30 (Control) is set to SERIAL AUTO the serial loss action is ignored
and the drive trips into a SERIAL FAULT stopping the drive and taking it out of serial
control.