User`s manual

93
Inverter Settings Chapter 7-2
7-2 Inverter Settings
7-2-1 Setting the Communications Conditions
Communications Time-over Detection Selection (n68)
• This parameter is used for monitoring the communications system.
• The set value in the parameter determines whether communications time-
over detection will be performed with “CE” displayed if there is an interval
of more than 2 s between normal communications. The method to
process the detected communications time-over is also determined
according to the set value in the parameter.
• When a control signal (the RUN command, forward/reverse rotation
command, or an external fault signal) is input into the Inverter through
communications, be sure to set n68 to 0, 1, or 2. Then the system will
stop in the case of a time-over detection. If there is a communications
failure, no control input will be operable. It will be, however, impossible to
stop the Inverter if n68 is to 4 or 3. Use a host program that monitors how
the Inverter handles all control input signals, for example, so that there will
be no interval of more than 2 s between communications.
Set Values
Note 1. 1. The fatal error is canceled with error reset input.
2. The nonfatal error warning is canceled when the communications returns
to normal.
Communications Frequency Reference/Display Unit Selection (n69)
• Set this parameter to the unit of frequency reference and frequency-
related values to be set or monitored through communications.
• This unit is for communications use only and independent from the units
of setting made through the Digital Operator.
n68 RS-422A/485 Communications
Time-over Detection Selection
Register 0144 Hex Changes during
operation
No
Setting
range
0 to 4 Unit of
setting
1 Default setting 0
Value Description
0 Detects a time-over and fatal error and coasts to a stop (See note 1.)
1 Detects a time-over and fatal error and decelerates to a stop in deceleration time 1 (See note 1.)
2 Detects a time-over and fatal error and decelerates to a stop in deceleration time 2 (See note 1.)
3 Detects a time-over and nonfatal error warning and continues operating.
The warning is canceled when the communications return to normal. (See note 2.)
4 No time-over is detected.
n69 RS-422A/485 Communications
Frequency Reference/Display
Unit Selection
Register 0145 Hex Changes during
operation
No
Setting
range
0 to 3 Unit of
setting
1 Default setting 0