Lenze TCF Series - Manual (Page 71)

B.4 ASSERTION LEVEL AND THE EPM
The TCF drive will store the setting of Parameter 79 - INPUT ASSERTION LEVEL on the
EPM (like it does with all of the other parameters), but it will also store this information
internally as a safeguard against the assertion level being changed accidentally by swapping
EPMs .
The P79 setting stored on the EPM must match the internally stored setting or the drive will
trip into an "A1" fault and will not operate . Therefore, if an EPM with a different P79 setting
is installed in a drive, the display will show the "A1" fault and the drive will not operate . The
only exception to this is if the EPM was just programmed using the EPM Programmer, and
it was being installed in a drive for the first time . In this case, the drive's internal assertion
level setting will change to match the EPM, as described in NOTE 1 in section B .3 .2, and no
fault would occur .
WARNING!
Changing the assertion level of the digital inputs without reconfiguring
the control wiring can cause the motor to start unexpectedly, resulting in
equipment damage and/or injury to personnel! Be sure the control wiring is
correct for the selected assertion level .
An "A1" fault can be cleared by one of the following methods:
1 . Perform a factory reset of the drive using Parameter 48 - PROGRAM
SELECTION . This will change the assertion level setting in the EPM to match
the internally stored setting .
2 . Power down the drive and install an EPM that has the same assertion level
setting as the internal setting .
3 . Power down the drive and install an EPM that has just been programmed with
the EPM Programmer .
4 . Change P79 to match the assertion level on the EPM . If the assertion level is
active-low, and needs to be set back to active-high, please contact Lenze-AC
Tech .
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