3.15 Main Menu - Application Functions -
Group 22
3.15.1 22-4* Sleep Mode
The purpose of sleep mode is to allow FC 101 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 FC 101
to adjust motor down to low speed. This might damage
pumps, cause insufficient lubrication in gearboxes, and
make fans unstable.
The sleep controller has two important functions - ability
to go to sleep at the right time, and ability to come out of
a sleep mode at the right time. The goal is to keep FC 101
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
adjustable frequency drive is now in sleep mode.
4.
FC101 compares the speed setpoint with
to detect a wake-up
situation.
5.
The speed setpoint is greater than
and the sleep condition has last for
more than
. The
adjustable frequency drive 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 an error between Reference and Feedback
is greater than
, the
adjustable frequency drive will go to Boost status.
If
is not set, the adjustable
frequency drive will go into sleep mode.
2.
After
, drive ramps the
motor speed down to
3.
The adjustable frequency drive activates
. The adjustable frequency
drive is now in Sleep mode.
4.
When an error between Reference and Feedback
is greater than
, and the
condition last more than
, the adjustable frequency drive is out of
sleep mode.
5.
The adjustable frequency drive goes back to
Close-loop control.
NOTE!
Sleep mode will not be 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 will override any wake-up
conditions.
22-43 Wake-Up Speed [Hz]
Range:
Function:
10
*
[ 0 - 400.0 ]
22-44 Wake-Up Ref./FB Diff
Range:
Function:
10 %
*
[0 - 100 %]
22-45 Setpoint Boost
Range:
Function:
0 %
*
[-100 - 100 %]
22-46 Maximum Boost Time
Range:
Function:
60 s
*
[0 -
600 s]
Only to be used if
is set
for closed-loop and the integrated PI controller
is used for controlling the pressure.
Set the maximum time for which boost mode
will be allowed. If the set time is exceeded,
sleep mode will be entered and will not wait for
the set boost pressure to be reached.
Parameters
VLT
®
HVAC Basic Drive Programming Guide
3-60
MG18B222 - VLT
®
is a registered Danfoss trademark
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