Motor Voltage Control - ABB +N5600 Firmware Instructions

58 ESP program features

Motor voltage control

The Motor voltage control function monitors voltage control settings.
In step-up applications, motor control is complicated with sophisticated electrical
circuit between drive and motor. Incorrect voltage settings and varying load might
result in less than optimal motor performance, excessive current feed and ultimately -
premature insulation wear.
If the original motor voltage settings are slightly incorrect, then the voltage profile can
be adjusted when the motor is running.
ESP control program provides two options of how motor voltage can be optimized:
1. Energy optimization function (enabled by default) can manage the voltage control
automatically.
• Using the electrical circuit model and motor current measured on output
phases, the function attempts to find optimal operating point.
• Energy optimizer even handles well situations when load conditions are
rapidly changing. When the function is enabled, the motor current estimate
produced by the control program provides more reliable indication about true
mechanical load on the motor.
2. User custom U/f curve.
• In case load profile is not a subject to change, the voltage control profile can
be set manually at different speeds.
• User can define voltage correction at eight custom speed points.
• The curve values can be adjusted on the fly.
• Works only if energy optimizer is disabled.
Flux reference %
160
140
120
100
80
60
40
20
0
20
Settings
Parameter group 80 Voltage control
Default voltage ref
Output voltage %
40 60
(page 437).
80
100
120