Taylor-Dunn MX-026-00 - Symptom Troubleshooting Guide; Pmc Control; Plugging Diode; Freewheel Diode

Curtis PMC Troubleshooting
Page19
SYMPTOMS GO TO
Ø
Runsslowinbothdirectionsplushigharmatureandeldcurrentinboth
directions.NOTE:Armatureandeldcurrentshouldbeequal.
MOTOR
Ø
Runsslowinbothdirectionsplushigharmaturecurrentinbothdirections.
NOTE:Fieldcurrentwillbeverylow.
SOLENOIDS
Ø
Ø
Runsnormalinonedirectiononlyplusrunssloworlackspowerintheop-
positedirectionwithhigharmaturecurrentintheoppositedirectionor;
Acceleratesslowlyandexceedsnormalspeedintheoppositedirection
withhigharmaturecurrentonly.NOTE:Fieldcurrentwillbeverylowin
theoppositedirection.
SOLENOIDS
Ø
Acceleratesslowlyandexceedsnormalspeedinbothdirectionsplushigh
armaturecurrent.NOTE:Fieldcurrentwillbeverylow.
SOLENOIDS
Ø
Fullspeedonly.
PMC CONTROL
Ø
Doesnotrunineitherdirectionplusthereisnoisefrommotor(humor
whine)withhigheldcurrentandlowarmaturecurrent.
PLUGGING DIODE
Ø
Excessivesparkwhenconnectingbattery
ISO
Ø
Doesnotrunorrunsveryslowwithlowmotorcurrentandhighbattery
current.
FREEWHEEL DIODE
Ø
Jumpsintohighspeedwhendirectionisselectedafterdepressingtheac-
celeratorpedal.
HPD
SYMPTOM TROUBLESHOOTING GUIDE
Thissectionisspecictothesymptomslistedbelow.Eachtroubleshootingsequenceassumes
thatalllistedsymptomsarepresent.Donotusethissectionunlessthetruckhasalllisted
symptoms.
Special Troubleshooting
Table of Contents
PMC CONTROL ...................................................................22
PLUGGING DIODE .............................................................25
FREEWHEEL DIODE ..........................................................26
ISO 27
SOLENOIDS .........................................................................29
MOTOR .................................................................................32