Rockwell Automation 1901 SyncPro - Manual (Page 43)

Programming 5-5
1901-UM020C-EN-P – June 2013
Set Point 8 • Incomplete Sequence Trip Time Delay
Once a synchronous starter has been commissioned, the acceleration
and synchronization times should remain fairly consistent provided
that the starting load does not vary significantly. The incomplete
sequence timer can be set to a time delay that is slightly higher than
the slowest acceleration time. The aforementioned squirrel-cage
protection features protect the motor, but they also let it go to its
thermal limitations. The ISTR set point can be adjusted to take the
starter off-line earlier than the squirrel-cage protection trip time
(set point 5) in the event of a field contactor failure or some other
mechanical problem that prevents synchronization. This action
minimizes motor heating during an equipment failure.
Allowable Range: 1 to 80 seconds
Factory Default Setting: 3 seconds
Set Point 9 • Diagnostic Fault Mask
This parameter is used to define a fault mask that will disable
individual diagnostic faults associated with the phase angle
transducer. The following values for the fault masks are used.
0 = All faults are enabled (default)
1 = Commissioning faults are disabled. This consists of
Reversed PF @ SyncPro and CT Reversed
2 = All Diagnostics associated with the Power Factor are disabled
16 = Reversed PF @ SyncPro
32 = All of the following individual faults are disabled:
64 = No Transducer Input
128 = CT Open/Shorted
256 = CT Reversed
512 = No Signal @ SyncPro
1024 = Transducer Problem
It is possible to selectively mask individual faults by adding up the
fault values and entering the result. For example, to disable the
Reversed PF @ SyncPro and No Signal @ SyncPro, the mask
value would be 528 (16 + 512).
NOTE: The value entered during prompting may not be the same
value displayed if the value can be represented more clearly by
some other combination of faults, ie. the value of 272 (16 + 256)
corresponds to 1.