Vacon CX, Руководство пользователя

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Vacon Plc
Phone: +358-(0)201 2121 Fax: +358-(0)201 212 205
Service: +358-40-8371 150 E-mail: vacon@vacon.com
Page 44 V V V V Vacon acon acon acon acon Multi-purpose Control Application II Multi-purpose Control Application II
Multi-purpose Control Application II Multi-purpose Control Application II
Multi-purpose Control Application II
The torque values for setting the underload curve
are set in percentage which refer to the nominal
torque of the motor. The motor's name plate data,
parameter 1. 13, the motor's nominal current and the drive's nominal current I
CT
are used to find the
scaling ratio for the internal torque value. If other
than nominal motor is used with the drive, the
accuracy of the torque calculation decreases.
7. 14 7. 14
7. 14 7. 14 7. 14
Underload protection Underload protection
Underload protection Underload protection Underload protection
Operation:
0 = Not in use
1 = Warning
2 = Fault
Tripping and warning will display the same message code. If tripping is set active
the drive will stop and activate the fault stage.
Deactivating the protection by setting the parameter to 0 will reset the underload time
counter to zero.
7. 15 7. 15
7. 15 7. 15 7. 15
Underload protection, field weakening area load Underload protection, field weakening area load
Underload protection, field weakening area load Underload protection, field weakening area load Underload protection, field weakening area load
The torque limit can be set between 20.0—150 % x T
nMotor
.
This parameter gives the value for
the minimum torque allowed when
the output frequency is above the
field weakening point.
Refer to figure 4.5-22.
If parameter 1
.....
13 is adjusted, this
parameter is automatically
restored to the default value.
Figure 6-30 Setting of minimum
load.
7. 16 7. 16 7. 16 7. 16 7. 16 Underload protection, zero Underload protection, zero Underload protection, zero Underload protection, zero Underload protection, zero
frequency load
frequency load frequency load frequency load frequency load
The torque limit can be set
between 10.0—150 % x T
nMotor
.
Par. 7. 15
UMCH7_15
Par. 7. 16
f
5 Hz
Underload area
Torque
Fieldweakening
point par. 6. 3
This parameter gives value for the minimum torque allowed with zero frequency.
Refer to figure 6-30. If parameter 1
..... 13 is adjusted this parameter is automatically
restored to the default value.
7. 17 7. 17
7. 17 7. 17 7. 17
Underload time Underload time
Underload time Underload time Underload time
This time can be set between 2.0—600.0 s.
This is the maximum allowed time for an underload state. There is an internal up/
down counter to accumulate the underload time. Refer to figure 6-31.
If the underload counter value goes above this limit the protection will cause a trip
(refer to the parameter 7
. .
. . . 14). If the drive is stopped the underload counter
is reset to zero.