Danfoss VLT 6000 HVAC User Manual

VLT
®
6000 HVAC
91MG.60.B1.02 - VLT is a registered Danfoss trade mark
★ = factory setting. ( ) = display text [ ] = value for use in communication via serial communication port
Programming
Description of choice:
Program the desired ramp-down time.
208 Automatic ramp-up/down
(AUTO RAMPING)
Value:
Disable (DISABLE) [0]
★ Enable (ENABLE) [1]
Function:
This function ensures that the VLT frequency
converter does not trip during deceleration if the
ramp-down time set is too short. If, during
deceleration, the VLT frequency converter registers
that the intermediate circuit voltage is higher than the
max. value (see page 101), the VLT frequency
converter automatically extends the ramp-up and
ramp-down time.
NB!
If the function is chosen as Enable [1], the
ramp time may be considerably extended in
relation to the time set in parameter 207 Ramp-down
time.
Description of choice:
Program this function as Enable [1] if the VLT fre-
quency converter periodically trips during ramp-down.
If a quick ramp-down time has been programmed that
may lead to a trip under special conditions, the
function can be set to Enable [1] to avoid trips.
209 Jog frequency (JOG FREQUENCY)
Value:
Par. 201 Output frequency Low limit - par. 202
Output frequency high limit ★ 10.0 H
Z
Function:
The jog frequency f
JOG
is the fixed output frequency at
which the VLT frequency converter is running when
the jog function is activated.
Jog can be activated via the digital inputs.
Description of choice:
Set the desired frequency.
Function, cont.:
The reference unit can be determined on the basis of
the following table:
Unit
Par. 100 Configuration = Open loop Hz
Par. 100 Configuration = Closed loop Par. 415
Description of choice:
Maximum reference is set if the motor speed is not to
exceed the set value, regardless of whether the
resulting reference is higher than Maximum reference.
206 Ramp-up time (RAMP UP TIME)
Value:
1 - 3600 sec. ★ Depends on the unit
Function:
The ramp-up time is the acceleration time from 0 Hz
to the rated motor frequency f
M,N
(parameter 104
Motor frequency, f
M,N
). It is assumed that the output
current does not reach the current limit (set in
parameter 215 Current limit I
LIM
).
Description of choice:
Program the desired ramp-up time.
207 Ramp-down time (RAMP DOWN TIME)
Value:
1 - 3600 sec. ★ Depends on the unit
Function:
The ramp-down time is the deceleration time from the
rated motor frequency f
M,N
(parameter 104 Motor
frequency, f
M,N
) to 0 Hz, provided there is no
overvoltage in the inverter because of the motor
acting as a generator.

Danfoss VLT 6000 HVAC Specifications

General

Brand	Danfoss
Model	VLT 6000 HVAC
Category	DC Drives
Language	English