Omron NT620C, Руководство по эксплуатации

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7-1 Section Hardware Faults
268
7-1 Hardware Faults
When a fault relating to the operation of the NT620S/620C occurs, find the symp-
toms in the table below and respond by following the corresponding “Remedy”
indicated in the table.
Caution - Confirm system safety before turning the power ON/OFF or resetting. Other-
wise the system may operate unpredictably.
- Do not disassemble the NT620S/620C for repairs or modification. Otherwise,
the product may malfunction.
NT620S/620C Symptoms Cause Remedy
POWER LED fails to
come ON Power is not being supplied. Check the connections and make sure that power is
supplied correctly.
(Refer to 2-2-2 “Power Supply Connection”, page
27.)
Power supply fuse has blown Contact your OMRON service center.
Nothing is displayed on
the screen (it is
completely white/LCD or
black/EL). Screen No. 0 has been read at the
PC side. This is not an error. Change the screen number.
(Refer to 4-3 “Screen Display”, page129.)
Communication with the
support tool not possible. The Transmit Mode has not been
established. Display the system menu and select the Transmit
Mode.
(Refer to 3-6 “Registering the Screen Data”, page
77.)
Not connected to the support tool. Check the installation of the connector cable.
(Refer to 2-3 “Connecting to the Support Tool”, page
29.)
PT model setting and direct access
setting at the support tool do not
match the NT620/620C. Using the “Tool Settings” of the support tool, set the
PT model and direct access settings that match the
NT620/620C.
Cannot communicate with
the PC. Memory switch settings do not
match. Check the communication setting in the “Memory
Switch” menu of the Maintenance Mode, and match
the PC and NT620S/620C settings.
(Refer to 3-5 “Setting the Conditions of
Communications with the PC by Using the Memory
Switches”, page 69.)
NT620S/620C and PC are not
correctly connected. Check that the type, length and installation of the
connector cable match the specifications.
(Refer to 2-5 “Connection to a PC by the Host Link”,
page 32, and 2-6 “Connection to a PC by the NT
Link”, page 43.)
In a host link connection, the PC
termination resistance setting is
incorrect. Set the PC termination resistance correctly.
In an NT link (1:N) connection, there
is duplication of unit numbers. Make the unit number settings again so that there is
no duplication. Refer to “Setting Unit Numbers (NT
Link 1:N Only)” (page 74).
The buzzer sounds and
the RUN LED goes off. Incorrect operation due to external
noise. Disconnect the communication cable from the
source of the noise and insert a noise filter in the
power supply line.
Touch panel does not
react. Incorrect operation due to external
noise. Disconnect the communication cable from the
source of the noise and insert a noise filter in the
power supply line.
The touch panel is broken. Test the touch panel using “I/O CHECK” in the
maintenance mode.