Rockwell-automation 20B PowerFlex 70, PowerFlex 700 Reference Manual Bedienungsanleitung PDF herunterladen (Seite 201)

Torque Performance Modes

Rockwell Automation Publication PFLEX-RM001H-EN-P - June 2013 201

Torque Performance

Modes

[Torque Perf Mode] or [Motor Cntl Sel] (Vector) selects the output mode of the

drive. The choices are:

• Custom Volts/Hertz

Used in multi-motor or synchronous motor applications.

• Fan/Pump Volts/Hertz

Used for centrifugal fan/pump (variable torque) installations for additional

energy savings.

• Sensorless Vector

Used for most general constant torque applications. Provides excellent

starting, acceleration and running torque.

• Sensorless Vector w/Economizer

Used in constant torque applications that have significant “idle” time (time

spent at greatly reduced load) to offer additional energy conservation.

The following table shows the performance differences between V/Hz and

Sensorless Vector.

Volts/Hertz

Volts/Hertz operation creates a fixed relationship between output voltage and

output frequency. The relationship can be defined in two ways.

1. Fan/Pump

When this option is chosen, the relationship is 1/X

. Therefore;

for full frequency, full voltage is supplied and for ½1/2 rated frequency,

1/4 voltage is applied, etc. This pattern closely matches the torque

requirement of a variable torque load (centrifugal fan or pump – load

increases as speed increases) and offers the best energy savings for these

applications.

2. Custom

Custom Volts/Hertz allows a wide variety of patterns using linear segments.

The default configuration is a straight line from zero to rated voltage and

frequency. This is the same volts/hertz ratio that the motor would see if it

Torque Mode

Fan/Pump and

Custom V/Hz with

Slip Comp

SVC with Slip

Comp

SVC with

Feedback

Flux Vector

without

Feedback

Flux Vector with

Feedback

Speed Regulation

(% of base speed)

0.5% 0.5% 0.1% 0.1% 0.001%

Operating Speed Range 40:1 80:1 80:1 120:1 1000:1

Speed Bandwidth 10 rad/sec 20 rad/sec 20 rad/sec 50 rad/sec 250 rad/sec

Maximum Voltage

Maximum

Frequency

Base Voltage

(Nameplate)

Base Frequency

(Nameplate)

Run Boost

1 2 ... 196 197 198 199 200 201 202 203 204 205 206 ... 213 214

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