Rockwell Automation 23P PowerFlex Digital DC Drive - Manual (Page 222)

222 Rockwell Automation Publication 20P-UM001K-EN-P - July 2014
Chapter 4 Troubleshooting
TorqPrv Spd Band 94 2 The difference between the commanded speed and the
encoder/resolver speed has exceeded the level set in Par
1105
[Speed Dev Band] for a time period greater than that value
specified in Par
1106 [Spd Band Intgrtr]. This fault is only
enabled when Par 1100 [Torq Prove Cfg], bit 0 “TP Enable” is
set and causes the drive to coast to a stop. Possible causes
include:
• Speed loop tuning is not correct.
Increase Par 434 [Spd Reg BW] or Par 433 [Total Inertia]. Note that if
these values are set too high, the speed regulator will become
unstable.
• The drive is operating under a current limit. Raise the current limit set in Par 7 [Current Limit]. Note that if this
value is set too high, a motor overload may occur.
• Drive acceleration/deceleration rates are too fast. Reduce the acceleration/deceleration rates.
• The brake is not releasing. Check brake wiring and operation.
• The motor field is not reaching the rated value. Check that the motor field is wired and configured correctly.
• The drive is undersized. Reduce the load.
Travel Lim Cflct 99 2 Travel limits are in conflict. Both the forward and reverse
travel limits indicate they are simultaneously active, causing a
drive current limit stop. • If digital limits (hardware signals) are in use, verify that the
following forward and reverse digital input pairs are not both off
at the same time: fwd/rev decel travel limit digital inputs and
fwd/rev end stop travel limit digital inputs (see Pars
133 … 144 ).
The travel limit digital inputs are meant to be connected to
normally closed switch contacts, so the digital input status will
read an off (0 = False) bit status when the machine is on limit
and the switch contact opens. A possible cause for this condition
is loss of common power to both the forward and reverse travel
limit switches.
• If software travel limits are in use, check the state of the fwd/rev
travel limit bits in Par 1101 [Torq Prov Setup]. These bits are on
(1) when the machine is on limit. Bit 2 “Decel Fwd” and bit 4
“Decel Rev” should not be on at the same time. Similarly, Bit 3
“End Stop Fwd” and bit 5 “End Stop Rev” should
not be on at the
same time.
(1) See page 215 for a description of fault types.
Fault Name Number Type (1) Description/Possible Cause(s) Action(s)