Danfoss VLT Flow Drive FC 111 User Manual

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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.
N O T I C E
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
Parameter type: Range
2-setup: All setups
Conversion index: 0
Data type: u_int16
Change during operation: True
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
Max: 600 s
Default value: 10 s
22-41 Minimum Sleep Time
Default value: 10 s
Parameter type: Range
2-setup: All setups
Conversion index: 0
Data type: u_int16
Change during operation: True
Set the minimum time for staying in sleep mode. This time overrides any wake-up conditions.
Table 396: Range:
Min: 0 s
Max: 600 s
Default value: 10 s
22-43 Wake-Up Speed [Hz]
Default value: 10
Parameter type: Range
2-setup: All setups
Conversion index: -1
Data type: u_int16
Change during operation: True
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
Max: 400.0
Default value: 0
22-44 Wake-Up Ref./FB Diff
Default value: 10%
Parameter type: Range
2-setup: All setups
Conversion index: 0
Data type: u_int8
Change during operation: True
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
set
) before canceling the sleep mode.
AU363928304090en-000101 / 130R0982170 | Danfoss A/S © 2021.07
Parameters
VLT® Flow Drive FC 111
Programming Guide

Danfoss VLT Flow Drive FC 111 Specifications

General

Brand	Danfoss
Model	VLT Flow Drive FC 111
Category	DC Drives
Language	English