Troubleshooting Operational Problems - KEB Combivert R6 Instruction Manual

Troubleshooting and Diagnostics

6.2.2 Troubleshooting Operational Problems

Problem Cause
High regenerative or High nominal motor current
supply current
High peak motor current during
acceleration/deceleration
Low input voltage/Excessive line
sag
Overutilization
Noise/EMI causing Imbalance line supply, Grounding
intermittent regen
faults (Error overcur-
rent, Error net, Error
line frequency).
Noise/EMI, Grounding
US - 38
Solution
Check the current on the F5 Elevator Drive.
Determine the cause of the high motor current, and
troubleshoot accordingly.
Check the peak current on the F5 Elevator Drive.
Determine the cause of the high peak motor current
and troubleshoot accordingly. Potentially adjust
acceleration/deceleration rates.
A decrease in input voltage causes a corresponding
increase in supply current. Verify the incoming
voltage, and insure that the line voltage is not
sagging.
Check CP.6 and CP.7. If CP.7=160%, then the regen
unit is being overutilized.
Line supply or transformer secondary MUST be a
balanced, center-grounded wye connection.
Check for actual connection of center-ground.
Measure phase-ground voltage at R6; they should
be balanced.
Measure phase-phase voltage at R6; they should
be balanced.
Add additional R6 ferrite ring to DC bus connections.
Installing the incorrect type of ferrite ring will not have
an affect mitigating noise.
Verify correct grounding connections and techniques
as well as panel wire layout.
Check for any loose or missing ground connec-
tions.
Ground conductors must be minimum #4 AWG or
thick ground strap.
DC bus wires (++, - -) should be tied together.
Any DC, AC, Motor leads or switching power (e.g.
brake or contactor coil) wires must be physically
separated from each other and not run together.
Add additional ferrite ring(s) around all motor lead
connections at drive output (additional ferrites around
individual motor leads is not necessary).