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 timeover 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.
n68
Setting range
RS-422A/485 Communications
Time-over Detection Selection
0 to 4
Register
Unit of setting
0144 Hex Changes during operation
1 Default setting
No
0
Set Values
0
Value Description
Detects a time-over and fatal error and coasts to a stop (See note 1.)
1
2
Detects a time-over and fatal error and decelerates to a stop in deceleration time 1 (See note 1.)
Detects a time-over and fatal error and decelerates to a stop in deceleration time 2 (See note 1.)
3
4
Detects a time-over and nonfatal error warning and continues operating.
The warning is canceled when the communications return to normal. (See note 2.)
No time-over is detected.
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 frequencyrelated 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.
n69
Setting range
RS-422A/485 Communications
Frequency Reference/Display
Unit Selection
0 to 3
Register
Unit of setting
0145 Hex Changes during operation
No
1 Default setting 0
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Set Values
Value Description
2
3
Converted value based on 30,000 as max. frequency
0.1% (Max. frequency: 100%)
Note Communications data after the above conversion is hexadecimal.
For example, if the frequency is 60 Hz and the unit of setting is 0.01 Hz, the converted value is obtained as follows: 60/0.01 = 6000 = 1770 Hex
Slave Address (n70)
n70
Setting range
• Set this parameter to the Slave address (Slave unit number) for communications.
• If more than one Inverter is connected as a Slave, make sure that there will be no Slave address duplication.
RS-422A/485 Communications
Slave Address
00 to 32
Register
Unit of setting
0146 Hex Changes during operation
1 Default setting
No
0
Set Values
Value Description
00
01 to 32
Only receives broadcast messages from the Master (See note.)
Slave address
Note Address 00 is for broadcast purposes only. Do not set the Slave to this address, otherwise the Slave will not communicate.
Communcations Baud Rate and Parity Selection (n71 and n72)
Set the baud rate and parity according to the communications conditions of the Master.
n71 Register
Setting range
RS-422A/485 Baud Rate
Selection
0 to 3 Unit of setting
0147 Hex Changes during operation
1 Default setting
No
2
2
3
0
1
Set Values
Value Description
2,400 bps
4,800 bps
9,600 bps
19,200 bps
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n72 RS-422A/485 Parity Selection Register 0148 Hex Changes during operation
1 Default setting
No
2 Setting range
0 to 2 Unit of setting
0
1
2
Set Values
Value Description
Even
Odd
No parity
Note
In normal serial communications, data is configured in single bytes, and messages are created by stringing together multiple bytes of data. The parity check described here sets the check for each byte of data. Set the parity check method that is required by the Master.
The entire message is checked by a separate check code called “CRC-16,” so the communications data will be checked even if no special parity check is performed.
Send Wait Time Setting (n73)
Set this parameter to an awaiting period for returning a response after the
DSR (data-send-request) message is received from the Master.
n73 RS-422A/485 Send Wait Time Register
Setting range
10 to 65 (ms) Unit of setting
0149 Hex Changes during operation
1 ms Default setting
No
10
Set Values When the DSR message is received from the Master, the Inverter must wait for a communications time of 24-bit length plus the set value in n73 before returning a response. Set this value according to the response time of the
Master.
RTS Control Selection (n74)
• Select whether or not to enable the RTS (request-to-send) communications control function.
• This function can be disabled (i.e., set to “1”) only when a 1-to-1 Master/
Slave configuration is used in RS-422A communications. When multiple
Slaves are used for RS-422A, or whenever RS-485 communications are used, it is necessary to set “0” (enable RTS control).
n74
Setting range
RS-422A/485 RTS Control
Selection
0, 1
Register
Unit of setting
014A Hex Changes during operation
1 Default setting
No
0
Set Values
0
1
Value Description
Enabled
Disabled (Available to 1-to-1 RS-422A communication only)
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7-2-2 Operation Command Selection (n02)
• Select the method to input the RUN or STOP command into the Inverter.
• This parameter is enabled in remote mode only. The Inverter in local mode accepts the RUN command only through key sequences on the
Digital Operator.
n02 Operation Command Selection Register
Setting range
0 to 2 Unit of setting
0102 Hex Changes during operation
1 Default setting
No
0
0
1
2
Set Values
Value Description
The RUN Key and STOP/RESET Key on the Digital Operator are enabled.
Multi-function input terminals are enabled in 2- or 3-wire sequence.
RS-422A/485 communications are enabled.
Note 1.
To input the RUN command through RS-422A/485 communications, set this parameter to 2. Then the RUN command only through RS-422A/485 communications will be enabled.
2.
The RUN command can be input through RS-422A/485 with multi-function input settings as well. For details, refer to
7-2-4 Setting the Multi-function
Inputs (n36 to n39)
.
7-2-3 Frequency Reference Input Selection (n03)
• Select the method to input the frequency reference into the Inverter in remote mode.
• Ten methods can be used to input the frequency reference in remote mode. Select the ideal method according to the application.
n03
Setting range
Frequency Reference
Selection
0 to 4, 6
Register
Unit of setting
0103 Hex Changes during operation
1 Default setting
No
0
4
6
2
3
0
1
Set Values
Value Description
The FREQUENCY adjuster on the Digital Operator is enabled.
Frequency reference 1 (n21) is enabled.
Frequency reference control terminal for 0- to 10-V voltage input is enabled.
Frequency reference control terminal for 4- to 20-mA current input is enabled.
Frequency reference control terminal for 0- to 20-mA current input is enabled.
Frequency reference through communications is enabled.
Note 1.
To input the frequency reference through RS-422A/485 communications, set this parameter to 6. Then the frequency reference only through RS-
422A/485 communications will be enabled.
2.
The frequency reference can be input through RS-422A/485 with multifunction input settings as well. For details, refer to
7-2-4 Setting the Multifunction Inputs (n36 to n39)
.
3.
The setting of n03 is valid for frequency reference 1, and is not related to frequency references 2 to 8. Frequency references 2 to 8 are set in n22 to n28.
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7-2-4 Setting the Multi-function Inputs (n36 to n39)
• In addition to the methods described above, the RUN command and frequency reference can be input through RS-422A/485 communications by setting the value 18 in any one of the parameters from n36 to n39
(multi-function input).
• Subsequently, the following operations are selectable in remote mode.
None of these parameters, however, can be changed while the operation command is being input.
When the function-set input terminal is OFF, the RUN command will be executed according to the setting in n02 (operation command selection) and the frequency reference will be executed according to the setting in n03 (frequency reference selection).
When the function-set input terminal is ON, the Inverter will operate according to the RUN command and frequency reference through RS-
422A/485 communications.
n36 Multi-function input 1 (S2) Register
Setting range
2 to 8, 10 to 22 Unit of setting
0124 Hex Changes during operation
1 Default setting
No
2 n37
Setting range
Multi-function input 2 (S3)
0, 2 to 8, 10 to 22
Register
Unit of setting
0125 Hex Changes during operation
1 Default setting
No
5 n38
Setting range n39
Setting range
Multi-function input 3 (S4)
2 to 8, 10 to 22
Multi-function input 4 (S5)
2 to 8, 10 to 22, 34, 35
Register
Unit of setting
0126 Hex Changes during operation
1 Default setting
No
3
Register
Unit of setting
0127 Hex Changes during operation
1 Default setting
No
6
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