3.15 Main Menu - Application Functions -
Group 22
3.15.1 22-4* Sleep Mode
The purpose of sleep mode is to allow FC101 to stop itself in
situations where the system is satisfied. This will save 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 for a reason
that some applications cannot allow the FC101 to adjust
motor down to low speed. This might damage pumps, cause
insufficient lubrication in gearboxes, and make fans unstable.
Sleep controller has two important functions - ability to go to
sleep at right time, and ability to come out of a sleep mode
at right time. The goal is to keep FC101 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.
FC101 ramps the motor speed down to
Speed for Function at Stop [Hz]
.
3.
FC101 activates
. The
frequency converter is now in sleep mode.
4.
FC101 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.
The motor speed is less than
and the motor has been running longer than
.
2.
FC101 activates the boost function (add the
to the setpoint). The frequency
converter is now in sleep boost mode.
3.
The new setpoint has been achieved or sleep boost
has been running for longer than
4.
FC101 ramps the motor speed down to
Speed for Function at Stop [Hz]
.
5.
FC101 activates
. The
frequency converter is now in sleep mode.
6.
FC101 compares process setpoint (without boost)
with feedback to detect wake up situation.
7.
The error (setpoint - feedback) is greater
than
and the sleep
condition has last for more than
The frequency converter is now out of
sleep mode.
8.
FC101 goes back to closed Loop control.
NOTE
Sleep Mode will not be active when Local Reference is active
(set speed manually by means of arrow buttons 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:
10.0 s
*
[0.0 - 600.0 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:
10.0 s
*
[0.0 - 600.0 s] Set the desired Minimum Time for staying
in Sleep Mode. This will override any wake
up conditions.
22-43 Wake-Up Speed [Hz]
Range:
Function:
10.0 Hz
*
[0.0 - 400.0 Hz]
22-44 Wake-Up Ref./FB Diff
Range:
Function:
10.0 %
*
[0.0 - 100.0
%]
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.
Parameters
VLT HVAC Basic Drive Programming Guide
MG.18.B1.02 - VLT
®
is a registered Danfoss trademark
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