4.4 Assume based on phenomena
4-3
Troubleshooting
4.2 Assume based on operation indicator
LED
If the power (PWR) lamp of the measurement master, CT expansion slave, or function slave is flashing,
it indicates that an error has occurred.
Operation indicator LED
PWR CONN ALM COMM
Assumable cause
Measures
Immediately after
power ON
(All LEDs lit)
-
Lit
Lit
Lit
Lit
Destruction of
EEPROM data
(All LEDs lit)
Repair is required. Contact the
supplier you purchased the product
from or our sales representative.
Duplicates of slave ID,
or out of range
Review the ID setting.
Duplicates of unit no.
Review the unit no.
Duplicates of the
master
Review the master/slave.
Over the allowable
number of units
connected
Check the number of units connected.
Incompatibility in
protocol of DIP
switches
Check the settings of CompWay/F and
Modbus and make the settings to
match the protocol.
Mismatch between the
connection
configuration and the
ID of the connected
slave
Make the ID of the connected slave
match the connection configuration.
Internal bus
communication not
allowed
Recheck the connection.
Lit
Flashing
Off
Off
Error in the unit
connected
Check the error of the unit.
Normal start-up
(independent)
-
Lit
Off
Off
Off
During measurement
(independent)
-
Normal start-up
(multiple units)
-
Lit
Lit
Off
Off
During measurement
(multiple units)
-
EEPROM error
RAM error
RTC error
If the condition is not changed even by
turning the power OFF, repair is
required. Contact the supplier you
purchased the product from or our
sales representative.
Flashing
Off
Off
Off
Communication error
If the condition is not changed even by
rechecking communication settings
and wiring, repair is required. Contact
the supplier you purchased the product
from or our sales representative.
Lit Lit/Off
/
Off
Lit RS-485/USB
communication in
progress
-
Lit Lit/Off
/
Lit Off/
Flashing
/
Alarm output in
progress
Since this is caused by functions of
units, check the settings and then refer
to Page 3-9.
Excess of over current
Excess of over voltage
Lit Lit/Off
/
Flashing
Off/
Flashing
/
Frequency input error
Return it to within the range of
standard.
