Rockwell Automation 1557 MEDIUM VOLTAGE AC DRIVE - Manual (Page 303)

TROUBLESHOOTING 10-61
1557-UM050F-EN-P – June 2013
Example:
Consider an application, which utilizes only the config. fault inputs 1, 2, 3 ,5, and 6. The requirements are:
 Inputs 1, 3 and 6 are to be ramp down trips “class 2”.
 Input 5 is desired to be an immediate trip “class 1”.
 Input 2 is to be only a warning “class 3”.
1. Enable or disable th
e utilized config. fault / warnings by going into “Setup” then into “FAULTS” and
setting the appropriate inputs to either “on” or “off”.
2. Place an x
“don‟t care” into all of the bit locations corresponding to the bits of the disabled config. fault
/ warnings as required.
Config. Fault / Warning
16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
Ext flt class 1 X X X X X X X X X X X
Ext flt class 2 X X X X X X X X X X X
3. Place a 1 or a 0 into the bit locations of both of the External Fault Class parameters to obtain the
desired class of fault. Note: you may place all 0‟s into the External Fault Class 2 bit locations
corresponding to class 1 faults (Ext. flt. Class 2 bit 5 in this example). See below:
Config. Fault / Warning
16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
Ext flt class 1 X X X X X X X X X X 0 1 X 0 0 0
Ext flt class 2 X X X X X X X X X X 1 0 X 1 0 1
4.
To simplify the solution, set all of the X‟s to 1.
Ext flt class 1 1 1 1 1 1 1 1 1 1 1 0 1 1 0 0 0
Ext flt class 2 1 1 1 1 1 1 1 1 1 1 1 0 1 1 0 1
5. Convert the individual 4 digit binary values to hex. values using the table shown above
Ext. flt. class 1
“binary value”
1
1
1
1
1
1
1
1
1
1
0
1
1
0
0
0
“hex value” F F D 8
Ext. flt. class 2
“binary value”
1
1
1
1
1
1
1
1
1
1
1
0
1
1
0
1
“hex value” F F E D
Therefore setting Ext. flt. class 1 = FFD8 hex, and Ext. flt class 2 to FFED hex would achieve the
desired faults classes for the external inputs.
Please confer with the customer in regards to their desired classes for their specific fault inputs and set
the hex values accordingly.
Consult the factory if fault classes for specific Allen-Bradley equipment are not known.