2-170 Parameter Descriptions
7000-TD002A-EN-P – September 2007
DC Current Reference 7 pulse to 5 pulse [Idc 5 Pulse]
Linear Number: 757
Minimum Value: 0.000 pu
Maximum Value: 10.000 pu
Access Level: Service
Read/Write: Read Only
This parameter indicates the dc link current value in per unit at which a PWM rectifier will switch from 7-
pulse firing to 5-pulse firing. If the dc link current is more than the parameter value and the dc link voltage
reference (Vdc Reference) is below Vdc Ref 7p to 5p (465), the drive will switch from 7-pulse to 5-pulse.
This value is calculated from the rated motor current, rectifier device current rating and the Idc Fac 7p to
5p (640).
DC Voltage Reference 5 pulse to 3 pulse [Vdc Ref 5p to 3p]
Linear Number: 379
Default Value: 0.10 pu
Minimum Value: 0.00 pu
Maximum Value: 1.50 pu
Access Level: Service
Read/Write: Read/Write
This parameter specifies the point at which a PWM rectifier will switch from 5-pulse firing to 3-pulse firing.
If the dc link voltage reference (Vdc Reference) drops below the programmed value and the dc link
current is more than Idc 3 Pulse (756), the drive will switch from 5-pulse to 3-pulse. The purpose of this
parameter is to reduce the amount of losses and heating in the rectifier by reducing the switching pulse
number.
DC Voltage Reference 7 pulse to 5 pulse [Vdc Ref 7p to 5p]
Linear Number: 465
Default Value: 0.50 pu
Minimum Value: 0.00 pu
Maximum Value: 1.50 pu
Access Level: Service
Read/Write: Read/Write
This parameter specifies the point at which a PWM rectifier will switch from 7-pulse firing to 5-pulse firing.
If the dc link voltage reference (Vdc Reference) drops below the programmed value and the dc link
current is more than Idc 5 Pulse (757), the drive will switch from 7-pulse to 5-pulse. The purpose of this
parameter is to reduce the amount of losses and heating in the rectifier by reducing the switching pulse
number.
DC Current Factor 5 pulse to 3 pulse [Idc Fac 3p to 5p]
Linear Number: 560
Default Value: 1.00
Minimum Value: 0.00
Maximum Value: 2.00
Access Level: Service
Read/Write: Read/Write
This parameter is used to modify the default level of dc current reference at which the rectifier will switch
from 5 pulse to 3 pulse operation. For normal drive operation, this parameter does not need to be
changed from the default of 1.00 pu because most drives can run in 7-pulse mode for the entire dc
current range. The purpose of this parameter is to reduce the amount of losses and heating in the
rectifier by reducing the switching pulse number.
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