Delta VFD-EL-W Series - Page 144

Chapter 4 Parameters｜VFD-EL-W
139
 Parallel connection
P
10.02
I
10.03
D
10.04
10.05
10.10
10.07
10.06
10.01
+
-
+
+
+
Setpoint
Input Freq.
Gain
PID
feedback
Integral
gain
limit
Output
Freq.
Limit
Digital
filter
Freq.
Command
10.20
PID Error Deviation Treatment
Default: 0
Settings
0: Warn and continue operation (no treatment)
1: Warn and coast to stop
2: Warn and ramp to stop
3: Coast to stop and restart after Pr.10.21 delay time (no warning)
4: Ramp to stop and restart after Pr.10.21 delay time. The number of times
of restart is limited by Pr.10.50
 In PID control mode, the AC motor drive acts according to this parameter when it detects PID
feedback deviation level occurs (Pr.10.12 and Pr.10.13).
10.21
PID Error Deviation Restart Delay Time
Default: 60
Settings
0–9999 sec.

10.22
Set Point Deviation Level
Default: 0
Settings
0–100%

10.23
Set Point Stop Detection Time
Default: 10
Settings
0–9999 sec.
 Pr.10.22 is based on the PID set point. If the deviation is less than Pr.10.22 and exceeds the
time set in Pr.10.23, the drive decelerates to stop to be constant pressure status (this
deceleration time is based on the setting for Pr.01.12). If the deviation is still in the range of the
error set during deceleration to stop, the system is in standby status.
Example:
If the set point of constant pressure control of a pump is 4 kg, Pr.10.22 is set to 5%, Pr.10.23 is
set to 15 seconds, then the deviation is 0.2 kg (4 kg × 5% = 0.2 kg). It means when the feedback
value is higher than 3.8 kg for a time exceeding 15 seconds, the AC motor drive decelerates to
stop, this deceleration time acts according to Pr.01-12. When the feedback value is less than 3.8
kg, the AC motor drive starts to run.