VLT® 7000 Booster
■
Auxiliary pump/sleep mode
As can be seen in the section
Operation Modes
, there
is a possibility for using an AUX pump. The control
of the auxiliary pump is done with the sleep-mode
functionality. This basically means, that if a mode
without AUX pump is selected, the sleep-mode function
will turn off the lead pump if flow demand gets low.
If a mode with AUX pump is selected the sleep-mode
function will turn on the auxiliary pump and turn off
the lead pump if flow demand gets low.
■
Quick menu 28 Par. 711 Sleep/AUX timer
Par. 711 Sleep/AUX timer
(SLEEP/AUX TIMER)
Value:
0 - 300 sec. (301 sec. = OFF)
With AUX pump
✭
150 sec.
Without AUX pump
✭
OFF
Function:
In this parameter the Sleep mode/AUX pump
functionality is activitated. The timer starts when
the theoretical output frequency drops below the
frequency set in parameter 712 Sleep frequency.
When the time set in the timer has expired, the lead
pump will ramp to stop via parameter 207 Ramp
down time. The lead pump will restart, when the
theoretical output frequency exceeds the frequency
in parameter 713 Wake up frequency.
The theoretical output frequency can be monitored
in the LCP. Please refer to par. 007, where the
readout can be set to
PID output
.
Description of choice:
Select OFF if the function is not wanted. Set
the threshold value that is to activate Sleep
mode after the output frequency has fallen below
parameter 712 Sleep frequency.
■
Quick menu 29 Par. 712 Sleep/AUX frequency
Par. 712
Sleep/AUX frequency
(SLEEP/AUX FREQ)
Value:
Par. 201 F
MIN
- par. 713 Wake up
frequency
✭
20 Hz
Function:
When the output frequency falls below the preset
value, the timer will start the time count set in
parameter 711 Sleep/AUX timer. The present
output frequency will follow the theoretical output
frequency until fmin is reached.
Description of choice:
Set the required frequency.
MG.70.A1.02 - VLT is a registered Danfoss trademark
104
