VLT
®
6000 HVAC
110
★ = factory setting. ( ) = display text [ ] = value for use in communication via serial communication port
MG.60.B1.02 - VLT is a registered Danfoss trade mark
403 Sleep mode timer
(SLEEP MODE TIMER)
Value:
0 - 300 sec.(OFF) ★ OFF
Function:
This parameter enables the VLT 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 VLT
frequency converter will turn off the motor.
The VLT 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 VLT frequency converter restarts the
motor.
Description of choice:
Set the required frequency.
406 Boost setpoint (BOOST SETPOINT)
Value:
0 - 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 VLT frequency converter stops the motor.
This extends the time during which the VLT
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.
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 VLT 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.
NB!
Switching frequencies higher than 4.5 kHz
implement automatic derating of the maximum
output of the VLT frequency converter. See Derating
of high switching frequency on page 112.
(124 paginas)
(1 paginas)
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