TABLE II
I
TROUBLESHOOTING
MALFUNCTION
POSSIBLE CAUSE
ACTION
a)
Motor does not run or will not run to
top speed.
a)
AC input to control missing. "PWR ON" LED also
will not light.
Check AC Line voltage.
b)
Fuse blown ( "PWR ON" LED aslo will not light).
Remove, check, and if necessary replace fuse(s).
c)
Motor Jammed mechanically.
Check by rotating the shaft manually.
d)
Field voltage low or missing, causing insufficient
torque under heavy loads. [Does not appy to PM
motors.
]
Check field voltage between terminasl F1 and F4 on 10TB.
Should read 200 VDC.
e)
Motor field open or disconnected and operating
under heavy load. [Does not apply to PM motors.]
Check motor field wiring. Check resistance as given in motor
tests with the power off.
f)
Terminals 10 and 11 on 1TB not connected.
Either a permanent jumper or contact closure must be used to
permit control operation. See the external wiring diagrams and
contactor o
perated s
ystems section
b)
Motor runs only at full speed. (In tach
feedback systems, proper maximum
voltage cannot be adjusted.)
a)
Motor field open or disconnected and operating
under light load. [Does not apply to PM motors.]
Check motor field wiring. Check resistance of the field as
given in the motor tests with the power off
b)
Motor field voltage low or missing and operating
under light load. [Does not apply to PM motors.]
Check field voltage. Field voltage should be 200 VDC.
c)
Tach feedback: Control board improperly set up for
tach and motor combination, or mini jumper is
missing between pins 2 and 3 on FB SELECT plug
2PL. (For armature feedback pins 1 and 2 are
jum
pered to
gether..
)
Refer to the tach feedback section for Proper board set-up.
