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7.2.3Key Parameter Details

Table 7-2 Fan Application with Closed Loop Control

Number

Value

Meaning

 

 

 

P1000

1

Digital set point preset in MIDIMASTER. Manual adjustment not normally

 

 

required.

 

 

 

P1040

20

Nominal setpoint

 

 

 

P0003

3

Allows all parameters to be adjusted and set.

 

 

 

P1080

10

Minimum fan speed

 

 

 

P1082

30

Maximum fan speed

 

 

 

P0778

4.00

Analog output 4 – 20 mA indicating output frequency. This signal is used as

 

 

part of the overall factory management system. Setting P0778 applies a

 

 

4 mA offset.

 

 

 

P1300

2

Quadratic V/F curve selected. Selecting the quadratic curve allows a higher

 

 

continuous output, but limits the overload capability, which is not needed in

 

 

this case. The quadratic curve also reduces the power consumption

 

 

because it is optimised for fan and pump applications.

 

 

 

P0300-

***

Settings to suit motor

P0311

 

 

 

 

 

P201

1

PID enabled. The following parameters give the best overall stability in this

 

 

particular application.

 

 

 

P202

0.3

P Gain

 

 

 

P203

0.06

I Gain

 

 

 

P204

0

D Gain

 

 

 

P205

1

Sample Interval

 

 

 

P206

0

Sensor Filtering

 

 

 

P207

100

Integral capture range

 

 

 

P208

1

Sensor type

 

 

 

P211

25

0% set point

 

 

 

P212

80

100% set point

 

 

 

P220

1

Switch off at minimum frequency

 

 

 

P0761

2

PI analog input 4 –20 mA to suit flow transducer

 

 

 

38

MICROMASTER Applications Handbook