Danfoss VACON 100 FLOW Series Application Manual page 250

VACON® 100 FLOW
Application Guide
11.15.10 Sleep Function When No Demand Is Detected
This function makes sure that the pump does not operate at a high speed when there is no demand in the system.
The function becomes active when the PID feedback signal and the output frequency of the drive stay in the specified hysteresis
areas for longer than set with parameter P3.13.10.4 SNDD Supervision Time.
There are different hysteresis settings for the PID feedback signal and the output frequency. The hysteresis for the PID feedback
(SNDD Error Hysteresis P3.13.10.2) is given in the selected process units around the PID setpoint value.
When the function is active, a short-time bias value (SNDD Actual Add) is added internally to the feedback value.
• If there is no demand in the system, the PID output, and the output frequency of the drive decrease to the direction of 0. If the
PID feedback value stays in the hysteresis area, the drive goes to the Sleep mode.
• If the PID feedback value does not stay in the hysteresis area, the function is deactivated and the drive continues to operate.
Hz
A
K
B C
Illustration 87: Sleep, No Demand Detected
A The output frequency of the drive
B The PID feedback value
C The PID setpoint value
D SNDD Frequency Hysteresis (P3.13.10.3)
E SNDD Error Hysteresis (P3.13.10.2) The hysteresis
area around the PID setpoint value.
F SNDD Actual Add (P3.13.10.5)
11.15.10.1 (ID 1649) Sleep No Demand Detection Enable
Location in the menu: P3.13.10.1
Use this parameter to activate the Sleep No Demand Detection (SNDD) function.
11.15.10.2 (ID 1658) SNDD Error Hysteresis
Location in the menu: P3.13.10.2
Use this parameter to set the hysteresis for the error value of the PID controller.
11.15.10.3 (ID 1663) SNDD Frequency Hysteresis
Location in the menu: P3.13.10.3
Use this parameter to set the hysteresis for the output frequency of the drive.
11.15.10.4 (ID 1668) SNDD Supervision Time
Location in the menu: P3.13.10.4
250 | Danfoss A/S © 2023.08
H
F
I
G
D
J
t
E
t
G SNDD Supervision Time (P3.13.10.4)
H The PID feedback value and the output frequency of
the drive are in the hysteresis areas for the set time
(SNDD Supervision Time). A bias value (SNDD Actual
Add) is added to the PID feedback value.
I SP1 Sleep Delay Time (P3.13.5.2)
J The drive goes to the Sleep mode.
K Process Unit (P3.13.1.4)
AB298035655957en-000201 / DPD01083
Parameter Descriptions