Danfoss VLT 2800 Design Manual page 105

Programming
462 Enhanced Sleep Mode Timer
Value:
Value 0 – 9999 s
Function:
The timer prevents cycling between sleep mode and
normal operation. If for instance the power consumption
drops below the no/low flow power curve, the adjustable
frequency drive changes mode when the timer expires.
Description of choice:
In case of cycling, set the timer to an appropriate value
that limits the number of cycles.
The value 0 disables enhanced sleep mode.
Note: In parameter 463 Boost set point, it is possible to set
up the adjustable frequency drive to provide a pressure
boost before the pump is stopped.
463 Boost setpoint
Value:
1 - 200%
Function:
This function can only be used if Closed loop has been
selected in parameter 100 Configuration.
In systems with constant pressure regulation, it is
advantageous to increase the pressure in the system
before the adjustable frequency drive stops the motor. This
extends the time during which the adjustable frequency
drive stops the motor and helps to avoid frequent starting
and stopping of the motor, e.g. in the case of leaks in the
water supply system.
There is a fixed boost time-out on 30 s if the boost
setpoint cannot be reached.
Description of choice:
Set the required Boost setpoint as a percentage of the
resulting reference under normal operation. 100%
corresponds to the reference without boost (supplement).
464 Wakeup Pressure
Value:
Parameter 204 Ref – parameter 215 - 218
MIN
Setpoint
Function:
When in sleep mode, the adjustable frequency drive wakes
up when the pressure is below the wake-up pressure for
the time set in parameter 462 Enhanced sleep mode timer.
Description of choice:
Set an appropriate value for the system. The unit is set in
parameter 416 Process units.
MG27E402
Design Guide
465
Value:
Value parameter 201 f
0 = OFF
(Hz)
Function:
This parameter is linked to parameter 467 Minimum Power
and is used for no/low flow power curve.
Description of choice:
Enter a value equal to or close to the desired minimum
frequency set in parameter 201 Output frequency low limit,
f . Note, that the extension of the no/low flow power
MIN
curve is limited by parameters 201 Output frequency low
limit, f
MIN
by parameters 465 Minimum pump frequency and 466
Maximum pump frequency.
466
Value:
Value parameter 201 f
100% of setpoint
(Hz)
Function:
This parameter is linked to parameter 468 Maximum pump
power and is used for the no/low flow power curve.
Description of choice:
Enter a value equal to or close to the desired maximum
frequency set in parameter 202 Output frequency high limit,
f .
MAX
467
Value:
0 – 500.000 W
Function:
The associated power consumption at the frequency
entered in parameter 465 Minimum pump frequency.
Description of choice:
Enter the no/low flow power reading at minimum pump
frequency entered in parameter 465 Minimum pump
frequency.
Depending on pump size or curve select [32] W or [8] kW
0
in parameter 009 Large display readout for fine tuning.
468
Value:
0 – 500.000 W
Function:
The associated power consumption at the frequency
entered in parameter 466 Minimum pump frequency.
Description of choice:
Enter the no/low flow power reading at maximum pump
frequency entered in parameter 466 Minimum pump
frequency.
Danfoss A/S © Rev. May/2014 All rights reserved.
Minimum pump frequency
– parameter 202 f
MIN
and 202 Output frequency high limit, f
Maximum Pump Frequency
- parameter 202 f
MIN
Minimum Pump Power
Maximum Pump Power
MAX
20
4 4
and not
MAX
MAX
50
0
0
103