VLT
®
8000 AQUA
Programming
403 Sleep mode timer
(SLEEP MODE TIMER)
Value:
0 - 300 sec.(OFF)
✭
OFF
Function:
This parameter enables the frequency converter to
stop the motor if the load on the motor is minimal.
The timer in parameter 403
Sleep mode timer
starts when the output frequency drops below the
frequency set in parameter 404
Sleep frequency
.
When the time set in the timer has expired, the
frequency converter will turn off the motor.
The frequency converter will restart the motor, when
the theoretical output frequency exceeds the frequency
in parameter 405
Wake up frequency
.
Description of choice:
Select OFF if this function is not wanted.
Set the threshold value that is to activate Sleep
mode after the output frequency has fallen below
parameter 404
Sleep frequency
.
404 Sleep frequency
(SLEEP FREQUENCY)
Value:
000,0 - par. 405
Wake up frequency
✭
0.0 Hz
Function:
When the output frequency falls below the preset value,
the timer will start the time count set in parameter 403
Sleep mode
. The present output frequency will follow
the theoretical output frequency until f
MIN
is reached.
Description of choice:
Set the required frequency.
405 Wake up frequency
(WAKEUP FREQUENCY)
Value:
Par 404
Sleep frequency -
par. 202 f
MAX
✭
50 Hz
Function:
When the theoretical output frequency exceeds the
preset value, the frequency converter restarts the motor.
Description of choice:
Set the required frequency.
406 Boost setpoint
(BOOST SETPOINT)
Value:
1 - 200 %
✭
100 % of setpoint
Function:
This function can only be used if
Closed loop
has
been selected in parameter 100.
In systems with constant pressure regulation, it is
advantageous to increase the pressure in the system
before the frequency converter stops the motor.
This extends the time during which the frequency
converter 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.
Use
Boost Time-Out
, par. 472, to set the boost
time-out. If the boost set-point cannot be reached
within the specified time, the frequency converter will
continue in normal operation (Not entering sleep mode).
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).
407 Switching frequency
(SWITCHING FREQ.)
Value:
Depends on the size of the unit.
Function:
The preset value determines the switching frequency of
the inverter, provided
Fixed switching frequency
[1] has
been selected in parameter 408
Interference reduction
method
. If the switching frequency is changed, this may
help to minimise possible acoustic noise from the motor.
NB!:
The output frequency of the frequency converter
can never assume a value higher than 1/10
of the switching frequency.
Description of choice:
When the motor is running, the switching frequency
is adjusted in parameter 407
Switching frequency
,
until the frequency has been achieved at which
the motor is as quiet as possible.
✭
= factory setting. () = display text [] = value for use in communication via serial communication port
MG.83.A2.02 - VLT is a registered Danfoss trademark
133