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 for example
constant pressure control, it is advantageous to
increase the system pressure before the motor is
stopped. This increase extends the time the motor
is stopped and helps to avoid frequent start/stop.
Set the required overpressure/overtemperature in
percentage of setpoint for the pressure (P
set
)/
temperature before entering the sleep mode.
If setting for 5%, the boost pressure is P
set
x1.05.
The negative values can be used for cooling tower
control where a negative change is needed.
22-46 Maximum Boost Time
Range:
Function:
60
s
*
[0 -
600 s]
Only to be used if
is set for
[3] Closed loop
and the integrated
PI controller is used for controlling the pressure.
Set the maximum time for which boost mode is
allowed. If the set time is exceeded, the frequency
converter enters the sleep mode without waiting
for the set boost pressure to be reached.
22-47 Sleep Speed [Hz]
Range:
Function:
0
*
[ 0 - 400.0 ] Set the speed below which the frequency
converter goes into sleep mode.
22-48 Sleep Delay Time
Range:
Function:
0 s [0 - 3600 s] Set the delay time that the motor waits before
entering sleep mode when the condition to
entering sleep mode is met.
22-49 Wake-Up Delay Time
Range:
Function:
0 s [0 - 3600 s] Set the delay time that the motor waits before
waking up from sleep mode when the
condition for wake-up is met.
4.16.4 22-5* End of Curve
The end-of-curve conditions occur when a pump is
yielding a too large volume to ensure the set pressure. This
situation can occur if there is a leakage in the distribution
pipe system after the pump causing the pump to operate
at the end of the pump characteristic, valid for the
maximum speed set in
parameter 4-13 Motor Speed High
Limit [RPM]
or
parameter 4-14 Motor Speed High Limit [Hz]
.
If the feedback is 2.5% of the programmed value in
parameter 20-14 Maximum Reference/Feedb.
(or numerical
value of
parameter 20-13 Minimum Reference/Feedb.
whichever is highest) below the setpoint for the required
pressure for a set time (
), and the pump runs with maximum speed set in
parameter 4-13 Motor Speed High Limit [RPM]
or
parameter 4-14 Motor Speed High Limit [Hz]
, the function
selected in
parameter 22-50 End of Curve Function
takes
place.
It is possible to get a signal on 1 of the digital outputs by
selecting
[192] End of Curve
in parameter group
5-3* Digital
Outputs
and/or parameter group
5-4* Relays
. The signal is
present, when an end-of-curve condition occurs and the
selection in
parameter 22-50 End of Curve Function
is
different from
[0] Off
. The end-of-curve function can only
be used when operating with the built-in PID controller
(
[3] Closed loop
in
parameter 1-00 Configuration Mode
).
22-50 End of Curve Function
Option:
Function:
NOTICE
Automatic restart resets the alarm and
restarts the system.
NOTICE
Do not set
parameter 14-20 Reset Mode
, to
[13] Infinite auto reset
, when
parameter 22-50 End of Curve Function
is
set to
[2] Alarm
. Doing so causes the
frequency converter to continuously cycle
between running and stopping when an
end-of-curve condition is detected.
NOTICE
If the frequency converter is equipped
with a constant speed bypass with an
automatic bypass function that starts the
bypass if the frequency converter
experiences a persistent alarm condition,
disable the automatic bypass function if
[2] Alarm
or
[3] Man. Reset Alarm
is
selected as the end-of-curve function.
[0]
*
Off
End-of-curve monitoring is not active.
[1]
Warning
The frequency converter continues to run, but
activates an end-of-curve warning
(Warning 94,
End of curve)
. A frequency converter digital
output or a serial communication bus can
communicate a warning to other equipment.
[2]
Alarm
The frequency converter stops running and
activates an end-of-curve alarm
(Alarm 94, End of
curve)
. A frequency converter digital output or a
serial communication bus can communicate an
alarm to other equipment.
Parameters
Programming Guide
MG03N202
Danfoss A/S © 11/2015 All rights reserved.
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