TROUBLESHOOTING
41
Counter accumulates too
many counts
1. Electrical noise causing extra counts.
2. Loose wires between sensors and
count inputs.
3. Sensor generation extra pulses
due to vibration, oscillation,
chatter or jitter.
1a. Check sensor lead installation to
insure that they are not bundled
with other power wiring.
1b. Connect low frequency select
terminals (terminals #11 and #13)
to DC Common if pulses from the
sensor are longer than 1 msec.
1c. Use shielded cable for wiring
sensors to Count Inputs
(terminals #10 and #14) and
connect the shield to terminal #32.
2. Check external sensor wiring.
3. Check sensor mounting and
motion of machine to determine if
these characteristics cause extra
counts. Use Quadrature encoders
where applicable.
Counter misses preset 1
Bypass preset 1 input is connected to DC
Common.
Check wiring on terminal #1.
Counter counts to preset
1 and recycles
Auto recycle mode is selected to auto
recycle at preset 1.
Check entry at Function 81.
Relays and transistor
outputs energize but do
not deenergize.
No option selected to unlatch outputs.
Utilize unlatch inputs, Unlatch at Reset
mode, Latch Until Reset Complete
mode, Unlatch At Alternate Preset
mode, or Timeout mode.
No printout or incorrect
printout is generated
when the control is
connected to a printer
1. No AC power applied to printer.
2. Printer improperly set up.
3. Serial communications output
incorrectly wired to printer.
4. Baud rates of control and printer not
setup to the same value.
1. Check AC power connections and
fuse in printer.
2. Check printer DIP switches for
correct setup. (See Printer
Installation Manual).
3. Check that the SDO+ (terminal
#35) on control is connected to
SDI- on printer and SDO- (terminal
#36) is connected to SDI+.
4. Check that the Baud rates of the
control and the printer are the
same.
PROBLEM
POSSIBLE CAUSES
REMEDIES
Figure 34.
Troubleshooting (Continued)
