TROUBLESHOOTING
40
GENERAL
Most problems encountered when applying the
control are due to wiring errors, improperly set
Function codes, and sensors which are not cor-
rectly installed. This section provides guidelines
for the detection and correction of these types of
problems. Additionally, a description of the diag-
nostic program included in the control is dis-
cussed.
,
,
,
,
CAUTION
BEFORE APPLYING POWER TO THE EQUIP-
MENT, RECHECK ALL WIRING TO INSURE
PROPER CONNECTIONS. MAKE SURE THE
AC LINE VOLTAGE IS CONNECTED ONLY TO
SCREW TERMINALS #25, #26, #27 AND #28.
CONNECTING AC POWER TO ANY OTHER
SIGNAL TERMINALS WILL CAUSE SEVERE
DAMAGE TO THE CONTROL.
PROBLEM
POSSIBLE CAUSES
REMEDIES
Display does not light
when AC power is turned
on.
1. No power applied on terminals #25,
#26, #27 and #28.
2. Terminals #25, #26, #27 and #28
improperly jumpered.
3. Short between terminals #19 or #20
and DC Common.
1. Check wiring, fuses and primary
AC power source.
2. Check jumper installation.
3. Immediately disconnect AC power
supply, check wiring.
Counter does not
increment or decrement
when sensor is activated.
1. Sensor malfunction, improperly
installed or connected.
2. Incorrect count mode selected for
type of sensor being used.
3. Reset input (terminal #17) connected
to DC Common.
4. Low frequency select terminals
(terminals #11 and #13) connected to
DC Common when sensor generates
count pulses less than 1 msec long.
1. Check sensor wiring, installation
and operation.
2. Check Function Code diagram
(Fig. 21) for proper value selection
for Function 60.
3. Check wiring.
4. Disconnect low frequency
terminals.
Counter counts in wrong
direction
1. Quadrature shaft encoder outputs A
and B reversed.
2. Add and Subtract signals reversed.
3. Improper count mode selected for
sensor configuration utilized.
4. Polarity of up/down control signal
reversed when Count With Direction
Control mode is selected.
1. Reverse wiring on inputs 1 and 2
(terminals #14 and #10).
2. Reverse wiring on inputs 1 and 2
(terminals #14 and #10).
3. Check Function Code diagram
(Fig. 21) for proper value selection
for Function 60.
4. Invert up/down control signal on
terminal #10 with an external relay
or transistor.
Figure 34.
Troubleshooting
