GEA ARIETE, Instructions For Use And Maintenance Manual

Page: 450 / 556

VLT
®
5000 Series
If low-frequency resonance problems are encoun-
tered, the time set must be longer.
117
117 Resonance dampening
(RESONANCE DAMP.)
Value:
0 - 500 %
✭
100 %
Function:
High-frequency resonance problems can be elimi-
nated by setting parameters 117 and 118.
Description of choice:
For less resonance oscillation, the value of parame-
ter 118 must be increased.
118
118 Resonance dampening time constant
(DAMP.TIME CONST.)
Value:
5 - 50 ms
✭
5 ms
Function:
High-frequency resonance problems can be elimi-
nated by setting parameters 117 and 118.
Description of choice:
Choose the time constant that provides the best
dampening.
119
119 High starting torque
(HIGH START TORQ.)
Value:
0.0 - 0.5 sec.
✭
0.0 sec.
Function:
In order to secure a high starting torque, approx. 2 x
I
VLT,N
for max. 0.5 sec. is allowed. However, the cur-
rent is limited by the protection limit of the VLT
frequency converter (inverter).
Description of choice:
Set the necessary time in which a high starting
torque is desired.
120
120 Start delay (START DELAY)
Value:
0.0 - 10.0 sec.
✭
0.0 sec.
Function:
This parameter enables a delay of the starting time.
The VLT frequency converter begins with the start
function selected in parameter 121.
Description of choice:
Set the desired time until acceleration is to begin.
121
121 Start function (START FUNCTION)
Value:
DC hold in start delay time
(DC HOLD/DELA Y TIME)
[0]
DC brake in start delay time
(DC BRAKE/DELA Y TIME)
[1]
✭
Coasting in start delay time
(COAST/DELA Y TIME)
[2]
Start frequency/voltage clockwise.
(CLOCKWISE OPERA TION)
[3]
Start frequency/voltage in reference direction
(HORIZONT AL OPERA TION)
[4]
VVC
p l u s
clockwise
(VVC+ CLOCKWISE)
[5]
Function:
This is where the desired state during start delay
(parameter 120) is selected.
Description of choice:
Select DC hold in the start delay time [0] so as to
energize the motor with a DC holding current (pa-
rameter 124) in the start delay time.
Select DC brake in the start delay time [1] so as to
energize the motor with a DC braking current (pa-
rameter 125) in the start delay time.
Select Coasting in the start delay time [2] and the
motor will not be controlled by the VLT frequency
converter during the start delay time (inverter off).
Start frequency/voltage clockwise [3] and VVC
plus
clockwise [5] is typically used in hoisting applications.
Start frequency/voltage in reference direction [4] is
used especially in applications with counterweight.
Select Start frequency/voltage clockwise [3] so as to
have the function described in parameter 130 and
131 in the start delay time.
The output frequency will equal the setting of the
start frequency in parameter 130, and the output
voltage will equal the setting of the start voltage in
parameter 131. Regardless of the value assumed by
the reference signal, the output frequency will equal
the setting of the start frequency in parameter 130
and the output voltage will correspond to the setting
of the start voltage in parameter 131.
This functionality is used typically in hoisting applica-
tions.
✭
= factory setting. () = display text [] = value for use in communication via serial communication port
MG.51.A1.02 - VLT is a registered Danfoss trade mark
116