X5 AC Drive User’s Manual
Chapter 7: X5 Parameters
DPD00089A
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85 -
© 2009 Vacon Incorporated All Rights Reserved
501 V/Hz Select
Default: Linear Fxd
Range: 0 to 7
Level 2
The
V/Hz Characteristic Selection
parameter determines the characteristic of the V/Hz curve and whether any boost
will be applied at starting. The following data values may be assigned:
Parameter Value
Description
Linear Auto
The Linear Auto selection operates the Vector algorithm and activates current limiting functionality.
Linear Fxd
V/Hz curve with the amount of boost fixed at the value set in parameter
502 (Voltage Boost)
.
Pump Fxd
V/Hz curve with the amount of boost fixed at the value set in parameter
502 (Voltage Boost)
.
Fan Fxd
V/Hz curve with the amount of boost fixed at the value set in parameter
502 (Voltage Boost)
.
Linear 2pc
Activates parameters
512 (Midpoint Frq)
and
513 (Midpoint Volt)
. These parameters are used to
define a midpoint through which the V/Hz curve passes so a custom curve may be created for
special motor applications.
Vector
Activates the sensorless vector algorithm for high torque / low speed operation. A vector-duty
motor should be used for this mode of operation. Vector mode does not use the Boost parameter
(parameter
502
)
502 Voltage Boost
Default: 1.0%
Range: 0.0 to 50.0%
Levels 1,2
Parameter
502, Voltage Boost
, increases the motor voltage at low speed to increase the starting torque of the motor.
The parameter sets the amount of boost to be applied at zero frequency. The amount of boost decreases linearly with
increasing speed.
This parameter is used when parameter
is set with
fixed boost
options.
503 V/Hz Knee Freq
Default: 60 Hz
Range: 25 to 400 Hz
Level 2
This parameter sets the point on the frequency scale of the V/Hz curve at which the output is at full line voltage.
Normally, this is set at the base frequency of the motor, but it may be increased to enlarge the constant torque range
on special motors. Setting this parameter to a higher value can reduce motor losses at low frequencies.
Table 7-2: Description of X5 Parameters
(Page 15 of 40)
MOTOR OVERHEATING
Too much boost may cause excessive motor currents and motor overheating. Use only as much boost
as is necessary to start the motor.
Failure to observe this instruction can result in equipment damage.
CAUTION
SURCHAUFFE DU MOTEUR
Une amplification de puissance excessive peut entraîner des surintensités de courant et faire la
surchauffe du moteur. N’utilisez que le niveau d’amplification nécéssaire pour démarrer le moteur.
Si cette directive n’est pas respectée, cela peut entraîner des dommages matériels.
ATTENTION
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