NSK Megatorque PS Series User Manual

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12.2.5. Communication Problem
Table 12-7: Troubleshooting for communication problem
Cause Remedy
1) Defective wiring of communication cable
• Check the wiring referring to “Appendix 6: Wiring of
RS-232C Communication Cable”.
• Be sure to short the signals RTS and CTS of the
Driver Unit even the signals RTS and CTS are not in
use.
2)
When a message “Communication Error” appears
on the display of the NSK Handy Terminal
FHT-21.
(The Handy Terminal displays the message by
itself.)
• This message assumes that the break of
the RS-232C communication cable.)
• In the normal state, the RTS signal of the Driver Unit
(CTS of the Handy Terminal side) is ON. This
message appears when the RTS signal is being off
for 2 seconds or longer.
• Try another NSK Handy Terminal M-FHT21.
3)
When a message “Communication Error” appears
on the display of the NSK Handy Terminal
FHT-21.
(The Handy Terminal displays the
message by itself.)
• This message assumes the difference in the board
rate.
• This message appears on the display if the data
length is longer than specified or the stop bit is not
2-bit.
• Check if the baud rate of the Handy Terminal is 9 600
[bps].
(Refer to the instruction manual of the Handy
Terminal.
• Use another M-FHT21.
4)
When _ (under bar)appears on the display:
• 4-1) The Handy Terminal was connected while the
power of the Driver Unit is turned on.
• 4-2) Break of signal cable.
• 4-3) Failure of the Driver Unit.
4-1) The RS-232C cable must be connected when the
power of the Driver Unit is off. Be sure to follow
the above procedure to protect the RS-232C device
of the personal computer.
4-2) Confirm the conductivity of the RS-232C cable.
4-3) If no failure is found in the cable and the Motor,
the Driver Unit may be defective. Replace it
referring to “Appendix 4: Procedure for Replacing
the EDC Driver Unit.”
5)
When no character appears on the screen;
• 5-1) Break of signal cable
• 5-2) Defective Driver Unit.
5-1) Confirm the conductivity of the RS-232C cable.
5-2) • Refer to “Appendix 2: How to Check Motor
Condition” and check the cable and the Motor.
Replace them if necessary.
• The Driver Unit may be defective. Replace it
referring to “Appendix 4: Procedure for
Replacing the EDC Driver Unit.”

NSK Megatorque PS Series Specifications

General

Brand	NSK
Model	Megatorque PS Series
Category	Engine
Language	English