Danfoss VLT 2800 Series Operating Instructions Manual page 18

Description of choice:
X can be set as follows:
S
1. The value is stated by the motor supplier.
2. The value is obtained through manual measure-
ments X is obtained by connecting a motor to
S
mains and measuring the phase-phase voltage
U and the idle current
M
Um
p
=
Xs
3xI
3. Use the factory settings of X
quency converter itself chooses on the basis of
the motor nameplate data.
119 High start torque 119
(HIGH START TORQ.)
Value:
0.0 - 0.5 sec.
Function:
To ensure a high start torque approx. 1.8 x I
be permitted for max. 0.5 sec. The current is, how-
ever, limited by the frequency converter's (inverter's)
safety limit. 0 sec. corresponds to no high start
torque.
Description of choice:
Set the necessary time for which a high start torque
is required.
120 Start delay
120
(START DELAY)
Value:
0.0 - 10.0 sec.
Function:
This parameter enables a delay of the start-up time
after the conditions for start have been fulfilled.
When the time has passed, the output frequency will
start by ramping up to the reference.
Description of choice:
Set the necessary time before commencing to accel-
erate.
121 Start function
121
(START FUNCTION)
Value:
DC hold during start delay time
(DC HOLD/DELA Y TIME)
DC brake during start delay time
(DC BRAKE/DELA Y TIME)
= factory setting. () = display text [] = value for use in communication via serial communication port
18
8
.
which the fre-
S
0.0 sec.
can
INV.
0.0 sec.
[0]
[1]
®
VLT 2800 Series
Coasting during start delay time
(COAST/DELA Y TIME)
Start frequency/voltage clockwise
(CLOCKWISE OPERA TION)
Start frequency/voltage in reference direction
(VERTICAL OPERA TION)
Function:
This is where to choose the required mode during
the start delay time (parameter 120 Start delay time).
Description of choice:
Select DC hold during start delay time [0] to ener-
gize the motor with a DC hold voltage during the
start delay time. Set voltage in parameter 137 DC
hold voltage.
Choose DC brake during start delay time [1] to ener-
gize the motor with a DC brake voltage during the
start delay time. Set voltage in parameter 132 DC
brake voltage.
Choose Coasting during start delay time [2] and the
motor will not be controlled by the frequency con-
verter during the start delay time (inverter turned off).
Choose Start frequency/voltage clockwise [3] to ob-
tained the function described in parameter 130 Start
frequency and 131 Voltage at start during start delay
time. Regardless of the value assumed by the refer-
ence signal, the output frequency equals the setting
in parameter 130 Start frequency and the output
voltage will correspond to the setting in parameter
131 Voltage at start.
This functionality is typically used in hoist applica-
tions. It is used in particular in applications in which
a cone anchor motor is applied, where the direction
of rotation is to start clockwise followed by the refer-
ence direction.
Select Start frequency/voltage in reference direction
[4] to obtain the function described in parameter 130
Start frequency and 131 Voltage at start during the
start delay time.
The direction of rotation of the motor will always fol-
low in the reference direction. If the reference signal
equals zero, the output frequency will equal 0 Hz,
while the output voltage will correspond to the set-
ting in parameter 131 Voltage at start. If the
reference signal is different from zero, the output fre-
quency will equal parameter 130 Start frequency
and the output voltage will equal parameter 131 Volt-
age at start. This functionality is used typically for
hoist applications with counterweight. It is used in
particular for applications in which a cone anchor
motor is applied. The cone anchor motor can break
MG.28.A5.02 - VLT is a registered Danfoss trade mark
[2]
[3]
[4]