3.15 Main Menu - Application Functions -
Group 22
3.15.1 22-4* Sleep Mode
The purpose of sleep mode is to allow the frequency
converter to stop itself in situations where the system is
satisfied. This saves energy, and keeps system from being
over-satisfied (too high pressure, water cooled too much in
cooling towers, building pressurisation problems). This is
also important as some applications prevent the frequency
converter to adjust 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 right time, and the ability to come out of
a sleep mode at right time. The goal is to keep the
frequency converter in sleep mode as long as possible to
avoid cycling the motor on and off frequently, and at the
same time keep the controlled system variable in
acceptable range.
The sequence when running sleep mode in Open Loop:
1.
The motor speed is less than
and the motor has been running longer than
.
2.
The frequency converter ramps the motor speed
down to
1-82 Min Speed for Function at Stop [Hz]
.
3.
The frequency converter activates
. The frequency converter is now in sleep
mode.
4.
The frequency converter compares the speed
setpoint with
to detect
wake up situation.
5.
The speed setpoint is greater than
and the sleep condition has last for
more than
. The
frequency converter is now out of sleep mode.
6.
Go back to speed open loop control (ramp motor
speed up to the speed setpoint).
The sequence when running sleep mode in Closed Loop:
1.
If
20-81 PI Normal/ Inverse Control
=
[0] Normal
.
When error between Reference and Feedback is
greater than
, the
frequency converter goes to Boost status. If
is not set, the frequency
converter goes into sleep mode.
2.
After
, the frequency
converter ramps the motor speed down to
1-82 Min Speed for Function at Stop [Hz]
.
3.
The frequency converter activates
. The frequency converter is now in Sleep
mode.
4.
When error between Reference and Feedback is
greater than
, and the
condition last more than
, the frequency converter is out of sleep
mode.
5.
The frequency converter goes back to Close Loop
control.
NOTICE
Sleep Mode is not active when Local Reference is active
(set speed manually by means of navigation keys on the
LCP).
Does not work in Hand-mode. Auto set-up in open loop
must be carried out before setting input/output in closed
loop.
22-40 Minimum Run Time
Range:
Function:
10 s
*
[0 - 600 s] Set the desired minimum running time for
the motor after a start command (digital
input or Bus) before entering Sleep Mode.
22-41 Minimum Sleep Time
Range:
Function:
10 s
*
[0 - 600 s] Set the desired Minimum Time for staying in
Sleep Mode. This overrides any wake up
conditions.
22-43 Wake-Up Speed [Hz]
Range:
Function:
10
*
[ 0 -
400.0 ]
Only to be used if
1-00 Configuration Mode
, is
set for Open Loop and speed reference is
applied by an external controller. Set the
reference speed at which the Sleep Mode
should be deactivated
22-44 Wake-Up Ref./FB Diff
Range:
Function:
10 %
*
[0 -
100 %]
Only to be used if
is set
for Closed Loop and the integrated PI controller
is used for controlling the pressure.
Set the pressure drop allowed in percentage of
set point for the pressure (Pset) before
cancelling the Sleep Mode.
22-45 Setpoint Boost
Range:
Function:
0 %
*
[-100 - 100 %]
Only to be used if
, is set for Closed Loop and the
integrated PI controller is used. In
systems with e.g. constant pressure
Parameters
VLT
®
HVAC Basic Drive FC 101 Programming Guide
76
MG18B302 - Rev. 2013-09-02
3
3
Summary of Contents for VLT HVAC Basic Drive FC 101
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