Omron K7DD User Manual page 144

8 Troubleshooting
8-1 Troubleshooting
Check the following table if the K7DD does not perform the expected operation.
When Problems
When the power is turned
At power
ON, [FREQ] (Frequency
ON
Out-of-Range Error) is lit
and the main display
shows "----".
The main display shows
"----".
In Cannot start teaching with
operation the simplified threshold
setting.
The [INTL] does not light
during teaching.
The alarm output indicator
does not light green even
when the alarm latch
cancel command is issued.
• The single light of
"VOLT," "CRNT," or
"FREQ" is lit.
• The parameter display is
indicated as "------".
At The communications
communic connection does not work
ations well.
connection
The unit error bit/input
circuit error bit in the "Unit
Status" became 1.
8 - 2
Cause
The frequency may not be
measured because no current is
input.
No voltage or current may be
input.
The input of the voltage or
current may be too small.
Teaching does not start if a
measurement error has occurred.
The wiring state may not be
3P3W2M or 3P4W.
The trigger mode has not been
set to continuous mode.
The alarm latch cancel
command may have been
issued when the monitored
feature has entered the alarm
range determined by the
critical/warning thresholds.
A measurement error may have
occurred.
The slave address specified in
the communication command
from the host may not match the
unit number of the K7DD.
The stop bit of the communication
command may not match that of
the K7DD side. When the
communication parity setting of
the K7DD is changed between
Even/Odd and None, the stop bit
setting is automatically changed
between 1 bit and 2 bits.
A self-diagnosis error has
occurred.
Possible correction
Check the wiring of the CTs. 3-4 I/O Wiring (P.3-8)
Check that the power supply is 3-4 I/O Wiring (P.3-8)
turned ON. Check also that the 3-5 Wiring to the Power
wiring is completed correctly. Lines (P.3-13)
Review the input range. Current Input Range,
Voltage Input Range in
6-6-2 Parameters on
Initial Setting Level
(P.6-21)
Remove the cause of the 4-5 Measurement Error
measurement error. (P.4-11)
• Review the parameters on 4-3-3 Description of
the Initial Setting Level, Operation (P.4-6)
and review also the wiring 6-6-2 Parameters on
state parameters. Initial Setting Level
(P.6-21)
Set the trigger mode to 4-3-3 Description of
continuous mode using the Operation (P.4-6)
Support Tool or via 5-2-2 Trigger
communications, and Measurement
perform power ON reset. Simulation (P.5-5)
Check the Adjustment Level 4-4 Alarm (P.4-9)
parameters and review the 6-5 Adjustment Level
set values for the
(LVL
critical/warming thresholds.
If this symptom occurs 4-5 Measurement Error
frequently, review the (P.4-11)
followings.
• Voltage Input Range
• Current Input Range
• Ratings of special CTs
Check if the slave address 7-6-1 Frame
numbers in the Configurations (P.7-9)
communication command are
correct.
Check if the communication Initial Setting of
parity and communication Communications
stop bit on the host side Converter in 3-6 Wiring
match. the Communications
Cables (P.3-14)
• Cycle the power supply. If 4-6 Self-diagnosis Error
operation returns to (P.4-13)
normal, then noise may
have caused the problem.
Check for noise.
• If the Unit does not
recover, contact your
OMRON representative.
Power Line Data Generator User's Manual (N233)
Remarks
) (P.6-13)
a