Danfoss VLT 8000 AQUA series Operating Instructions Manual page 147

466 Maximum Pump Frequency
(PUMP MAX. FREQ)
Value:
Value par. 201 f - par. 202 f
MIN
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 or close to the desired
maximum frequency set in parameter 202 Output
frequency high limit, f .
MAX
467 Minimum Pump Power
(MIN. PUMP POWER)
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.
468 Maximum Pump Power
(MAX. PUMP POWER)
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.
469 No Flow Power Compensation
(NF POWER COMP)
Value:
0.01 - 2
Function:
This function is used for an off-set of the no/low
flow power curve, which can be used as a safety
factor or for fine tuning of the system.
= factory setting. () = display text [] = value for use in communication via serial communication port
MG.83.A2.02 - VLT is a registered Danfoss trademark
(Hz)
50
MAX
0
0
1.2
®
VLT 8000 AQUA
Description of choice:
Description The factor is multiplied to the power
values. E.g. 1.2 will increase the power value with
1.2 over the whole frequency range.
470 Dry Run Time Out
(DRY RUN TIME OUT)
Value:
5-30 sec.
Function:
If the power is below the no/low flow power curve,
running at max speed for the time set in this parameter,
the frequency converter will trip on Alarm 75: Dry run.
In open loop operation the maximum speed does not
necessarily need to be reached before tripping.
Description of choice:
Set the value to obtain the desired delay before
tripping. Manual or automatic restart can be
programmed in parameter 400 Reset function
and 401 automatic restart time.
The value 30 disables Dry run detection.
NB!:
The value of this parameter must be set
lower than the value of ESL Timer, par. 463.
Otherwise dry run trip will never occur.
471 Dry Run Interlock Timer
(DRY RUN INT TIME)
Value:
0.5-60 min.
Function:
This timer determines when a trip due to dry run can
be reset (both automatically and manually). When
the timer expires, restart the frequency converter by
resetting it either automatically or manually.
Description of choice:
Parameter 401 Automatic restart time still determines
how frequent an attempt to reset a trip will be
performed. If for instance parameter 401 Automatic
restart time is set to 10 sec. and parameter 400
Reset function is set to Automatic Reset x10 the
frequency converter will attempt to reset the trip 10
times within 100 seconds. If parameter 471 is set
to 30 min. the frequency converter will consequently
30 = OFF
30 min.
147