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Deviation limit

of PI control

Deviation limit of PI control defines the comparison between PI

system output and maximum deviation value which is limited by closed-loop
set value. As is shown in the graph, PI regulator is shut down while it's within
deviation limit. The precision and stability of PI system can be improved by
setting this function code properly.

Sampling period

(T)

Sampling period (T) means sampling period of feedback quantity;

operation is performed by regulator once every one sampling period. The
longer sampling period is, the slower response will be.

The feedback variable of PI can be always detected by system; if

feedback variable is less than the detected value of feedback dis-connection,
system will consider feedback signal to be disconnected by default; if
feedback variable is still less than the detected value of feedback
disconnection while actual time is more than the time for detecting feedback
disconnection, PIE can be detected and sent out by the system.

0.00~2.00

Default:

0.02

P7-06

0.1

100.0s

Default:

0.02s

P7-07

Detected value

of feedback

disconnection

0.00

5.00

Default:

0.0

P7-08

Time for detecting

feedback

disconnection

0.0

100.0s

Default:

10.0s

P7-09

Feedback variable

Deviation limit

Output Frequency

Time

Present value

Dormancy function description: when the back pressure value >

dormancy pressure (P7-13), the frequency of running < dormancy frequency
(P7-14). Waiting for the time of sleep (P7-12), began to sleep. When the
pressure of the feedback < wake up pressure (P7-15), will cease to
dormancy, inverter will run again.

1.1 Dormancy frequency (P7-14) Settings:

1.2 dormancy pressure (P7-13) set: dormancy pressure value slightly
smaller than the target value.

1.3 when a dormant frequency P7-14 = 0 or resting pressure P7-13 = 0,
don't start the sleep function.

In under the condition of no water or gas, make the inverter running in the PID
control mode (P0-01 = 0 or 1), start the inverter. Observation line pressure,
slowly increase the frequency to the target according to user's requirements,
record the current operating frequency after downtime. Set the dormant
frequency (P7-14) just above the record frequency of 1-3 hz or so.

Sleep time

3000s

600

P7-12

Dormancy pressure

50.0Hz

P7-14

P7-13

P7-15

Dormancy frequency

Wake up the pressure

10.00

P8: Simple PLC and Multispeed Parameters

Program run

mode

0 : Disabled
1 : Program stop after one-cycle running
2 : Program operates as last program runs
after one-cycle running
3 : Circulatory running of program

Default: 0

P8-00

0: Disabled

1: Program stop after one-cycle running

2: Program operates as last program runs after one-cycle running

Converter will be stopped automatically after one-cycle running; only after run
command is entered again will it be started.

The operating frequency and direction in the last program will be remained to the end
after one-cycle running.

The next cycle of operation will be proceeded by converter automatically right after
one-cycle running; system will not be shut down until stop command is received.

3: Circulatory running of program

A0: Group Torque control parameter

Parameter

Name

Setting Range

Default

Prope-

rty

Modbus

Address

Fun-

ction

Code

A0-00

Speed/torque

control

selection

●

A0-01

Torque setting

source in

torque control

●

A0-03

Torque digital

setting in

torque control

-200.0%

〜

200.0%

150.0%

A0-05

Forward

maximum

frequency in

torque control

0.00Hz

〜

Maximum frequency

50.00Hz

A0-06

Reverse

maximum

frequency in

torque control

0.00Hz

〜

Maximum frequency

50.00Hz

A0-07

Acceleration

time in

torque control

0.00s

〜

65000s

0.00s

A0-08

Deceleration

time in

torque control

0.00s

〜

65000s

0.00s

0 : speed control
1 : torque control

0 : Digital setting (A0-03)
1 : AI1 2 : AI2 3 : AI3
4 : Pulse setting
5 : Communication reference
6 : MIN (AI1, AI2)
7 : MAX (AI1, AI2)
(1-7 options full scale,
Corresponding to A0-03
number setting)

A5: Control optimization parameter

Parameter

Name

Setting Range

Default

Prope-

rty

Modbus

Address

Fun-

ction

Code