40 Issue Number: 3
9.3 Drive Reset Using The Profibus-DP Network
The Unidrive control word does not provide a RESET bit to clear a trip
condition in the Unidrive. There are three methods of resetting the
Unidrive from the master controller via the Profibus-DP network.
9.3.1 Reset Without DPL Code
To implement a RESET function without using DPL code, one of the
application bits in the control word (see section 5.8) must be used. The
application bits directly control #18.31, #18.32 and #18.33, so one of
these parameters must be used to control the RESET function (#10.33)
of the Unidrive. A 0-1 transition of the application bit will reset the
Unidrive.
Assuming #18.31 is to be used as the RESET bit, one of the
programmable logic functions in menu 9 can be used to link #18.31 to
#10.33, and control resetting of the Unidrive. The table below shows
the Unidrive parameter settings required. An alternative configuration
using logic function 2 can be implemented by using the parameters in
brackets instead.
Parameter Value
Parameter Value
#9.04 (#9.14) 18.31 #9.08 (#9.18) 0
#9.05 (#9.15) 0 #9.09 (#9.19) 0.0
#9.06 (#9.16) 0.00 #9.10 (#9.20) 10.33
By default, #10.33 is directly controlled by digital input 2. This must be
disabled by setting the mapping parameter for digital input 2 (#8.13) to
another value.
If the terminal reset function is required in addition to a fieldbus reset
function, logic function 1 or 2 can be configured as an OR function of
the fieldbus and terminal reset signals. The parameter settings for
menu 9 to implement this are shown below.
Parameter Value
Parameter Value
#8.13 <> 10.33 #9.07 (#9.17) 1
#9.04 (#9.14) 18.31 #9.08 (#9.18) 1
#9.05 (#9.15) 1 #9.09 (#9.19) 0.0
#9.06 (#9.16) 8.02 #9.10 (#9.20) 10.33
NOTE
The Unidrive may need to be reset several times if multiple trips have
occurred. As the reset will only occur on a 0 -1 transition of #10.33, the
master controller should toggle the RESET bit until Drive Healthy (bit 0
of the status word) goes to 1.
9.3.2 Reset Using CT Mode Non-Cyclic Communications
If CT Mode non-cyclic communication has been implemented in the
master controller, the Unidrive can be reset the Unidrive by writing a
value of 100 to #10.38. The Unidrive may require several reset
attempts is multiple trips have occurred. Use bit 0 of the status word
(Drive Healthy) to check that the Unidrive has been successfully reset.
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