Danfoss VLT Flow Drive FC 111 Programming Manual page 170

VLT® Flow Drive FC 111
Programming Guide
4.16.4 22-4* Sleep Mode
Sleep mode allows the drive to stop itself in situations where the system is in balance. This function saves energy and prevents
excessive pressure, water excessively cooled in cooling towers, and building pressurization problems in the system. This is also im-
portant as some applications prevent the drive from adjusting the motor down to low speed. This might damage pumps, cause
insufficient lubrication in gearboxes, and make fans unstable.
The sleep controller has 2 important functions:
• The ability to go to sleep at the right time.
• The ability to abandon sleep mode at the right time.
The goal is to keep the drive in sleep mode as long as possible to avoid cycling the motor on and off frequently, and also keep the
controlled system variable within the acceptable range.
Sleep mode is not active when local reference is active (set speed manually using the navigation keys on the LCP). Sleep mode
does not work in local mode. Perform an auto setup in open loop before setting input/output in closed loop.
22-40 Minimum Run Time
Default value: 10 s
Conversion index: 0
Set the wanted minimum running time for the motor after a start command (digital input or bus) before entering sleep mode.
Table 395: Range:
Min: 0 s
22-41 Minimum Sleep Time
Default value: 10 s
Conversion index: 0
Set the minimum time for staying in sleep mode. This time overrides any wake-up conditions.
Table 396: Range:
Min: 0 s
22-43 Wake-Up Speed [Hz]
Default value: 10
Conversion index: -1
Only to be used if parameter 1-00 Configuration Mode is set to [0] Open loop, and an external controller applies speed reference. Set
the reference speed at which the sleep mode should be deactivated. The wake-up speed must not exceed the setting in parameter
4-14 Motor Speed High Limit [Hz].
Table 397: Range:
Min: 0
22-44 Wake-Up Ref./FB Diff
Default value: 10%
Conversion index: 0
Only to be used if parameter 1-00 Configuration Mode is set for [3] Closed loop and the integrated PI controller is used for controlling
the pressure. Set the pressure drop allowed in percentage of setpoint for the pressure (P
170 | Danfoss A/S © 2021.07
N O T I C E
Parameter type: Range
Data type: u_int16
Max: 600 s
Parameter type: Range
Data type: u_int16
Max: 600 s
Parameter type: Range
Data type: u_int16
Max: 400.0
Parameter type: Range
Data type: u_int8
2-setup: All setups
Change during operation: True
Default value: 10 s
2-setup: All setups
Change during operation: True
Default value: 10 s
2-setup: All setups
Change during operation: True
Default value: 0
2-setup: All setups
Change during operation: True
) before canceling the sleep mode.
set
AU363928304090en-000101 / 130R0982
Parameters