E6581738

3.3.1.Tolerance Range (ZSW Bit 8)

If the setpoint is changed:

1.ZSW Bit 8 is set 0

2.Calculate the tolerance.

3.Start the timer which will time-out based on parameter Tmax.

PDP003Z checks that the timer (Tmax) has not timed-out and if the actual value is within the tolerance. If both conditions are fulfilled ZSW Bit 8 is set 1 and the timer is stopped.

The figure shows ZSW 8 when Tolerance (c157) is 50% and Tmax (c151) is 3s.

Tolerance

 

 

 

 

= 0x4000 * 50%

 

 

 

 

HIW

setpoint

actual value

 

 

 

 

 

 

HIW = 0x4000

 

 

 

 

HIW = 0x3000

 

 

 

 

HIW = 0x2000

 

 

 

 

HIW = 0x1000

15s

20s

25s

30s

HIW = 0x0000

Time

Tmax

Tmax

Tmax

 

 

= 3s

 

 

 

 

ZSW Bit 8

- 12 -

Page 14
Image 14
Toshiba VF-MB1/S15 instruction manual Setpoint Actual value, 15s 20s 25s 30s, Tmax, ZSW Bit