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Altivar
®
58 TRX AC Drives
Suggested Specifications
139
09/2003
© 2000–2003 Schneider Electric All Rights Reserved
f. For a fault condition other than a ground fault, short circuit or internal fault, an auto restart function
will provide restart.
g. The deceleration mode of the AC drive shall be programmable for normal and fault conditions. The
stop modes shall include free-wheel stop, fast stop, and DC injection braking.
h. A synchronized restart shall be provided that will catch a spinning motor by sensing the motor
frequency and rotational direction and synchronize the AC drive's output prior to restarting.
i. Upon loss of the analog process follower reference signal, the AC drive shall fault and/ or operate at
a user defined speed set between software programmed low speed and high speed settings.
j. The AC drive shall have solid state I
2 t protection that is UL listed and meets UL 508 C as a Class
20 overload protection and meets IEC 60947. The adjustment shall be from 0.45 to 1.05 percent of
the current output of the AC Drive.
k. The AC Drive shall have a thermal switch with a user-selectable pre-alarm that will provide a
minimum of 60 seconds delay before overtemperature fault.
l. The AC Drive may utilize bonded fin heatsink construction for maximum heat transfer.
m. The AC drive shall have a programmable fold-back function that will anticipate drive overload
condition and fold back the switching frequency to avoid a fault condition.
n. There shall be three skip frequencies that can each be programmed with a selectable bandwidth of
± 2.5 Hz, selectable anywhere in the speed range.
2.08 Adjustments and Configurations
a. The AC drive shall have a user selectable Auto Tune feature. The Auto Tune will automatically send
a signal to the connected motor and store the resulting resistance data into memory. The inductance
data will be measured during no-load operation. The AC Drive will automatically optimize the
operating characteristics according to the stored data.
b. The AC drive will contain factory pre-set Macros in order to speed configuration of I/O for the most
common applications. The Macro menu shall contain configurations for material handling, general
use and variable torque.
c. A choice of three types of acceleration and deceleration ramps will be available in the AC Drive
software: linear, S curve and U curve.
d. The acceleration and deceleration ramp times shall be adjustable from 0.1 to 999.9 seconds.
e. The volts per frequency ratios shall be user-selectable to meet quadratic torque loads, normal and
high torque machine applications.
f. The memory shall retain and record run status and fault type of the past 8 faults.
g. Slip compensation shall be a software-enabled function.
h. The software shall have a selectable energy savings function nLd (energy Eco) function that will
reduce the voltage to the motor when selected for variable torque loads. A constant volts/Hz ratio
will be maintained during acceleration. The output voltage will then automatically adjust to meet the
torque requirement of the load.
i. The AC drive shall offer programmable DC injection braking that will brake the AC motor by injecting
DC current and creating a stationary magnetic pole in the stator. The level of current will be
adjustable between 50 and 150% of rated current and available from 0.0 to 30 seconds continuously.
For continuous operation after 30 seconds, the current shall be automatically reduced to 50% of the
nameplate current of the motor.
j. Sequencing logic will coordinate the engage and release thresholds and time delays for the
sequencing of the AC drive output, mechanical actuation, and DC injection braking in order to
accomplish smooth starting and stopping of a mechanical process.