Toshiba TOSVERT VF-MB1 Function Manual page 17

6.2.1. 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 (
Tolerance
= HIW ± (HIW * 50%)
HIW
15s
Tmax
= 3s
ZSW Bit 8
Note: The status of this bit is NOT defined when immediately after the power is turned ON.
Setpoint
Actual value
20s 25s
Tmax
- 15 -
c157
) is 50% and Tmax (
30s
Tmax
E6581738④
c151
) is 3s.
HIW = 0x4000
HIW = 0x3000
HIW = 0x2000
HIW = 0x1000
HIW = 0x0000
Time