SJ700-2 Instruction Manual NT204DX - Hitachi America, Ltd.
Share Embed Flag
Download ePaper

SJ700-2 Instruction Manual NT204DX - Hitachi America, Ltd.

SJ700-2 Instruction Manual NT204DX - Hitachi America, Ltd. SJ700-2 Instruction Manual NT204DX - Hitachi America, Ltd.

hitachi.america.us
from hitachi.america.us More from this publisher
29.01.2015 Views

Chapter 4 Explanation of Functions 4.3.3 Vector control with encoder feedback - To use this control function, specify "05" (V2) for the V/F characteristic curve selection (A044). (You can specify the vector control with sensor only when the 1st motor control is selected.) - Before using this function, be sure to make optimum constant settings for the motor with reference to Section 4.2.95, "Motor constant selection." Also, set the pulse count of the encoder to be used. - You can select the speed control or pulse train position control mode by the pulse train mode setting (P013). - When using this function, observe the following precautions: 1) If you use the inverter to drive a motor of which the capacity is two classes lower than the maximum applicable capacity of the inverter, you may not be able to obtain adequate motor characteristics. 2) If the inverter does not accelerate the motor normally or the overload protection operates, check the phase sequence of the encoder signal. (For forward rotation, phase B normally leads phase A by a phase angle of 90°.) You can check the direction of motor rotation with the actual-frequency monitoring function (d008). For checking with this monitoring function, specify "00" (VC) for the V/F characteristic curve selection (A044) and make the inverter operate the motor. (Normally, a positive frequency is monitored when a forward-operation command is input, and vice versa.) 3) If you cannot obtain the desired characteristics from the motor driven under the vector control with sensor, readjust the motor constants according to the symptom, as described in the table below. Operation status Symptom Adjustment method Starting Decelerating Torque-limited operation Low-frequency operation The motor generates an impact when it starts. The motor runs unsteadily. Torque is insufficient during the torque-limited operation at low frequencies. Related code A001: Frequency source setting A044/A244: V/F characteristic curve selection, 1st/2nd motors F001: Output frequency setting b040: Torque limit selection b041 to b044: Torque limits (1) to (4) H002/H202: Motor data selection, 1st/2nd motors H003/H203: Motor capacity, 1st/2nd motors H004/H204: Motor poles setting, 1st/2nd motors H005/H205: Motor speed constant, 1st/2nd motors H020/H220: Motor constant R1, 1st/2nd motors H021/H221: Motor constant R2, 1st/2nd motors H022/H222: Motor constant L, 1st/2nd motors H023/H223: Motor constant Io, 1st/2nd motors H024/H224: Motor constant J, 1st/2nd motors H050/H250: PI proportional gain, 1st/2nd motors H051/H251: PI integral gain, 1st/2nd motors H052/H252: P proportional gain setting, 1st/2nd motors P011: Encoder pulse-per-revolution (PPR) setting P012: Control pulse setting Reduce the motor constant J from the set value. Reduce the speed response setting. Reduce the motor constant J from the set value. Reduce the overload restriction level to lower than the torque limiter level. Adjustment item H024/H034 H005 H024/H034 b021, b041 to b044 Motor rotation is inconsistent. Increase the motor constant J from the set value. H024/H034 Note 1: Always set the carrier frequency (b083) to 2.1 kHz or more. If the carrier frequency is less than 2.1 kHz, the inverter cannot operate the motor normally. Note 2: When driving a motor of which the capacity is one class lower than the inverter, adjust the torque limit (b041 to b044) so that the value "α", calculated by the expression below, does not exceed 200%. Otherwise, the motor may be burnt out. α = "torque limit" x (inverter capacity)/(motor capacity) (Example) When the inverter capacity is 0.75 kW and the motor capacity is 0.4 kW, the torque limit value is calculated as follows, based on the assumption that the value "α" should be 200%: Torque limit (b041 to b044) = α x (motor capacity)/(inverter capacity) = 200% x (0.4 kW)/(0.75 kW) = 106% 4 - 98

Chapter 4 Explanation of Functions 4.3.4 Torque biasing function The torque biasing function allows you to make the inverter bias the torque command generated during the operation in speed control mode. You can effectively use this function for inverter applications to a lift or other elevating machines. Item Function code Data or range of data Description 00 None Torque biasing mode P036 01 Bias setting from the digital operator selection 02 Bias setting via the O2 terminal (*1) -200 to +200 (%) Torque bias setting P037 Valid when "P036" = "01" (*3) Torque biasing polarity 00 Depending on the sign of bias value P038 selection (*2) 01 Depending on the motor rotation direction *1 When the torque bias is set as a signal input via the O2 terminal, the inverter recognizes the signal voltage -10 to +10 (V) as the bias value -200 to +200 (%). *2 1) When "00" (depending on the sign of the bias value) is specified: Regardless of the direction of motor rotation, torque in the forward direction increases when the torque bias signal indicates a positive (+) value. Torque in the reverse direction increases when the torque bias signal indicates a negative (-) value. 2) When "01" (depending on the motor rotation direction) is specified: The sign of the bias value indicated by the torque bias signal and the direction of the torque biasing change according to the rotation direction specified by the operation command. With a forward operation command: the torque is generated in the same direction as that specified by the sign of the torque bias value. With a reverse operation command: the torque is generated in the opposite direction to that specified by the sign of the torque bias value. *3 :applied for 75 to 150kW 4.3.5 Torque control function The torque control function is effective in the V2 control mode. You can use the inverter not only under the speed control or pulse train position control but also with this torque control function. You can use this function effectively for inverter applications to, for example, a winding machine. To operate the inverter to drive the motor under torque control, assign function "52" (ATR) to an intelligent input terminal. The torque command input is enabled when the ATR terminal is on. You can select one of four torque command input methods (digital operator and three analog input terminals) by the torque command input selection (P034). Item Function code Data or range of data Description 00 Input from the O terminal Torque command input 01 Input from the OI terminal P033 selection 02 Input from the O2 terminal 03 Input from the digital operator Torque command setting Polarity selection at the torque command input via the O2 terminal Speed limit for torque-controlled operation (forward rotation) Speed limit for torque-controlled operation (reverse rotation) P034 P035 P039 P040 0 to 200 (%) 4 - 99 Torque setting for the input from the digital operator (P033 = 03) 00 Depending on the sign of torque value 01 Depending on the motor rotation direction 0.00 to 99.99 or 100.0 to 400.0 (Hz) 0.00 to 99.99 or 100.0 to 400.0 (Hz) Related code P036: Torque biasing mode selection P037: Torque bias setting P038: Torque biasing polarity selection d010: Torque bias monitoring Related code P033: Torque command input selection P034: Torque command setting P035: Polarity selection at the torque command input via the O2 terminal P039: Speed limit for torque-controlled operation (forward rotation) P040: Speed limit for torque-controlled operation (reverse rotation) d009/d010/d012: Torque command monitoring P036: Torque biasing mode selection P037: Torque bias setting P038: Torque biasing polarity selection d010: Torque bias monitoring C001 to C008: Terminal [1] to [8] functions 00 None Torque biasing mode selection P036 01 Bias setting from the digital operator 02 Bias setting via the O2 terminal Torque bias setting P037 -200 to +200 (%) Valid when "P036" = "01" Torque biasing polarity 00 Depending on the sign of bias value P038 selection 01 Depending on the motor rotation direction Terminal function C001 to C008 52 ATR: Permission for torque command input *1 :applied for 75 to 150kW

Chapter 4 Explanation of Functions<br />

4.3.3 Vector control with encoder feedback<br />

- To use this control function, specify "05" (V2) for the V/F<br />

characteristic curve selection (A044). (You can specify the<br />

vector control with sensor only when the 1st motor control is<br />

selected.)<br />

- Before using this function, be sure to make optimum<br />

constant settings for the motor with reference to Section<br />

4.2.95, "Motor constant selection." Also, set the pulse count<br />

of the encoder to be used.<br />

- You can select the speed control or pulse train position<br />

control mode by the pulse train mode setting (P013).<br />

- When using this function, observe the following precautions:<br />

1) If you use the inverter to drive a motor of which the<br />

capacity is two classes lower than the maximum<br />

applicable capacity of the inverter, you may not be able to<br />

obtain adequate motor characteristics.<br />

2) If the inverter does not accelerate the motor normally or the overload protection operates, check the<br />

phase sequence of the encoder signal. (For forward rotation, phase B normally leads phase A by a<br />

phase angle of 90°.)<br />

You can check the direction of motor rotation with the actual-frequency monitoring function (d008). For<br />

checking with this monitoring function, specify "00" (VC) for the V/F characteristic curve selection<br />

(A044) and make the inverter operate the motor. (Normally, a positive frequency is monitored when a<br />

forward-operation command is input, and vice versa.)<br />

3) If you cannot obtain the desired characteristics from the motor driven under the vector control with<br />

sensor, readjust the motor constants according to the symptom, as described in the table below.<br />

Operation status Symptom Adjustment method<br />

Starting<br />

Decelerating<br />

Torque-limited<br />

operation<br />

Low-frequency<br />

operation<br />

The motor generates an<br />

impact when it starts.<br />

The motor runs unsteadily.<br />

Torque is insufficient during<br />

the torque-limited operation at<br />

low frequencies.<br />

Related code<br />

A001: Frequency source setting<br />

A044/A244: V/F characteristic curve selection,<br />

1st/2nd motors<br />

F001: Output frequency setting<br />

b040: Torque limit selection<br />

b041 to b044: Torque limits (1) to (4)<br />

H002/H202: Motor data selection, 1st/2nd motors<br />

H003/H203: Motor capacity, 1st/2nd motors<br />

H004/H204: Motor poles setting, 1st/2nd motors<br />

H005/H205: Motor speed constant, 1st/2nd motors<br />

H020/H220: Motor constant R1, 1st/2nd motors<br />

H021/H221: Motor constant R2, 1st/2nd motors<br />

H022/H222: Motor constant L, 1st/2nd motors<br />

H023/H223: Motor constant Io, 1st/2nd motors<br />

H024/H224: Motor constant J, 1st/2nd motors<br />

H050/H250: PI proportional gain, 1st/2nd motors<br />

H051/H251: PI integral gain, 1st/2nd motors<br />

H052/H252: P proportional gain setting, 1st/2nd<br />

motors<br />

P011: Encoder pulse-per-revolution (PPR) setting<br />

P012: Control pulse setting<br />

Reduce the motor constant J from the set value.<br />

Reduce the speed response setting.<br />

Reduce the motor constant J from the set value.<br />

Reduce the overload restriction level to lower than<br />

the torque limiter level.<br />

Adjustment<br />

item<br />

H024/H034<br />

H005<br />

H024/H034<br />

b021, b041<br />

to b044<br />

Motor rotation is inconsistent. Increase the motor constant J from the set value. H024/H034<br />

Note 1: Always set the carrier frequency (b083) to 2.1 kHz or more. If the carrier frequency is less than 2.1<br />

kHz, the inverter cannot operate the motor normally.<br />

Note 2: When driving a motor of which the capacity is one class lower than the inverter, adjust the torque<br />

limit (b041 to b044) so that the value "α", calculated by the expression below, does not exceed<br />

200%. Otherwise, the motor may be burnt out.<br />

α = "torque limit" x (inverter capacity)/(motor capacity)<br />

(Example) When the inverter capacity is 0.75 kW and the motor capacity is 0.4 kW, the torque<br />

limit value is calculated as follows, based on the assumption that the value "α" should<br />

be 200%:<br />

Torque limit (b041 to b044) = α x (motor capacity)/(inverter capacity) = 200% x (0.4<br />

kW)/(0.75 kW) = 106%<br />

4 - 98

logo

products

Resources

Company

Terms of service
Privacy policy
Cookie policy
Cookie settings
Imprint
Change language
Made with love in Switzerland
© 2024 Yumpu.com all rights reserved

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!