8.3.4 Starter not decelerating as desired
8.3.5 Motor stops unexpectedly while running
177
8 - TROUBLESHOOTING & MAINTENANCE
Condition
Cause Solution
Motor stops too quickly. Decel Time (P18/CFN17) set too short. Increase Decel Time.
Decel Begin and End Levels (P16/CFN15
and P17/CFN16) set improperly.
Increase Decel Begin and/or Decel
End levels.
Decel time seems correct but motor surges
(oscillates) at beginning of deceleration
cycle.
Decel Begin Level (P16/CFN15) set too high. Decrease Decel Begin Level until
surging is eliminated.
Decel time seems correct but motor stops
before end of deceleration cycle.
Decel End Level (P17/CFN16) set too low. Increase Decel End Level until
motor just stops at the end of the
deceleration cycle.
Water hammer still occurs at end of cycle. Decel End Level (P17/CFN16) set too high. Decrease Decel End Level until
water hammer is eliminated.
Decel Time (P18/CFN17) too short. If possible, increase Decel Time to
decelerate system more gently.
Motor speed drops sharply before decel Decel begin level to low. Increase the Decel Begin Level until
drop in speed is eliminated.
Condition Cause Solution
Fault Displayed. Fault Occurred. See fault code troubleshooting table for
more details.
Ready Displayed. Start command lost. Verify start command input signal is
present or serial communications start
command is present.
Check any permissive that may be wired
into the run command. (Start/Stop)
Display Blank, Heartbeat LED on MX
2
card not blinking.
Control voltage absent. Check for proper control voltage input.
Verify wiring and fuses.
MX
2
control card problem. Consult factory.
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