ABB ACS255 User Manual page 50

Parameters in the Long parameter mode
Index Name/Selection
26 MOTOR CONTROL
2601 ENERGY OPTIMIZER
0 : DISABLED
1 : ENABLED
2603 V/F MODE VOLTAGE
BOOST
2606 EFFECTIVE SWITCHING
FREQUENCY
4...32 kHz
2607 AUTOMATIC THERMAL
MANAGEMENT
4...32kHz
2610 V/F CHARACTERISTIC
ADJUSTMENT VOLTAGE
0 %...100% of 9905
2611 V/F CHARACTERISTIC
ADJUSTMENT FREQUENCY
0.0 %...100% of 9907
30 FAULT FUNCTIONS
3005 THERMAL OVERLOAD
VALUE RETENTION
0 : DISABLED
1 : ENABLED
3018 COMMUNICATION LOSS
ACTION
0 : TRIP & COAST TO STOP
1 : RAMP TO STOP THEN
TRIP
2 : RAMP TO STOP ONLY
(NO TRIP)
3 : RUN AT PRESET SPEED
4
3019 COMMUNICATIONS LOSS
TIMEOUT
0.0...5.0 s
31 AUTOMATIC RESET
3103 AUTO RESET TIME DELAY
1...60 s
Description
Motor control variables
Only active when enhanced V/F motor control mode is selected (parameter 9903 MOTOR
CONTROL MODE = 2)
The Energy Optimizer attempts to reduce the overall energy consumed by the drive and
motor when operating at constant speeds and light loads. The output voltage applied to the
motor is reduced. The Energy Optimizer is intended for applications where the drive may
operate for some periods of time with constant speed and light motor load, whether
constant or variable torque.
Voltage boost is used to increase the applied motor voltage at low output frequencies, in
order to improve low speed and starting torque. Excessive voltage boost levels may result in
increased motor current and temperature, and force ventilation of the motor may be
required.
An automatic setting () is also possible, whereby the ACS255 will automatically adjust
this parameter based on the motor parameters measured during an autotune.
Effective power stage switching frequency. The range of settings available and factory
default parameter setting depend on the drive power and voltage rating. Higher frequencies
reduce the audible 'ringing' noise from the motor, and improve the output current
waveform, at the expense of increased drive losses. Refer to section 11.5.3 on page 60 for
further information regarding operation at higher switching frequency.
Drive will automatically reduce the output switching frequency to this value at higher heat
sink temperature, to reduce the risk of an over temperature trip.
Used in conjunction with parameter 2611
When operating in V/F mode (Parameter 9903 = 2), this parameter in conjunction with
parameter 2610 sets a frequency point at which the voltage set in Parameter 2610 is applied
to the motor. Care must be taken to avoid overheating and damaging the motor when using
this feature.
Programmable protection functions
Alternative means of protecting the motor from thermal overload must be applied (e.g. PTC
thermistor)
The drive will retain the motor thermal overload value following a mains power cycle.
Controls the behaviour of the drive following a loss of communications as determined by the
above parameter setting.
Runs at the value set in parameter 1205 PRESET / JOG FREQUENCY / SPEED 4.
Sets the watchdog time period for the communications channel. If a valid telegram is not
received by the ACS255 within this time period, the drive will assume a loss of
communications has occurred and react as selected below. Setting to zero disables the
function.
Automatic fault reset. Automatic resets are possible only for certain fault types and when the
automatic reset function is activated.
Sets the delay time which will elapse between consecutive reset attempts when Auto Resest
is enabled in Parameter 2108 START MODE SELECT / AUTOMATIC RESTART.
51
Def
0 : Disabled
Drive rating
dependant
Drive Rating
Dependent
4kHz
0 %
0 %
0 :
DISABLED
0 : Trip &
Coast To
Stop
1.0
20 s