Schneider Electric 58 TRX

Altivar® 58 TRX AC Drives

Suggested Specifications

141

f. There will be 2 analog inputs. 1 analog input will be software selectab le and consi st of the f ollo wing

configurations: 0-20 ma, 4-20 ma, 20-4 ma, x-20 ma (where x is user defined). The other analog

input shall be 0-10 Vdc.

g. There will be 4 isolated logic inputs, 3 shall be user assignable in the software. The selection of

assignments, at a minimum, shall consist of run, rev ers e , jo g, ramp switching, plus/minus speed (2

inputs required), setpoint memory, preset speeds (up to 8 speeds), auto/manual control, fast stop,

forced local, motor switching, and fault reset.

h. One voltage-f ree Form C relay output contacts will be provided to indicate AC drive fault status. An

additional NO relay contact will be user assignable.

i. There will be one analog output as standard that will be software selectable from 0–20 mA or

4–20 mA to represent a signal proportional to one of the following: motor current, motor speed,

± torque, motor power, PI loop variables, drive or motor thermal states.

j. There shall be available an additional hardware input/output extension card which also provides

interlocking and sequencing capabilities. The card shall be fully isolated with pull apart terminal

strips. The analog output assignments shall be proportional to the following motor characteristics:

frequency, current, power, torqu e , and thermal state. The output signal will be selectable from 0-20

ma or 4-20 ma. All of the I/O will be user assignable in the software as previously defined.

2.11 Braking (Application-dependent Option)

NOTE:When braking certain types of loads, there is the conversion of kinematic energy into electrical

energy by the motor which is returned to the AC drive. Dynamic braking can be chosen to absorb this

energy and avoid causing the AC drive to inadvertently shut down. The energy is dissipated across a

resistor that is connected to the drive. For constant torque A C driv es , th e dyna mic b raki ng unit mu st be

capable of stopping 1.5 per unit motor torque from base frequency to 0.5 H z with sens orless flux v ector

control mode.

a. The dynamic brake resistor shall be provided and connect to existing terminals on the AC drive. The

resistor shall mount externally to the AC drive enclosure. A power transistor will be provided in the

AC drive to switch the excess energy to the braking resistor. The braking resistor will be of a size

calculated to stop 6 times motor inertia at 1.5 per unit motor torque.

2.12 HARMONIC ANALYSIS

NOTE:The amount of harmonic distortion at the point of common coupling (PCC) is due to the

distribution system characteristics (impedance of the source) and the power source size relative to the

AC drive load. The harmonic current magnitude and v oltage dis tortion va lues can b e pr edicted thro ugh

computer modeling. If the resulting calculations determine that th e harmonic dist ortion will be abo ve the

IEEE-519 specifications of 5%, isolation transformers or line reactors can be supplied to lower the

harmonic levels. The isolation transformers or line re actors ar e mounted at the A C drive i nput to red uce

the current harmonics that are fed back into the supply.

a. A harmonic analysis shall be performed and priced as a separate line item by the AC drive

manufacturer based upon system documentation consisting of but not limited to one-lin e diagrams

and specific distribution transformer information consisting of X/R,%Z, and kVA data. The data shall

consist of but not be limited to total harmonic voltage distortion and total rms current.

b. The maximum allowable input line unbalance shall be [5% for 460 V input line short circuit capacity

of 15,000 amps] [2.5% for 460 V input line short circuit capacity of 30,000 amps] [.5% for 460 V input

line short circuit capacity of 65,000 amps]. If the resulting voltage ha rmonic d ist ortion exceeds 5%,

three phase, line reactor(s) shall be priced as a separate line item.

c. The line reactor(s) if required shall be provided in stand-alone Type 1 enclosures for mounting

separately from the AC drive.