Schneider Electric 58 TRX manual Protection, Adjustments and Configurations, 178

Class 8839 58M Enclosed AC Drives

Specifications

h.The AC Drive will be able to develop rated motor torque at 0.5 Hz (60 Hz base) in a sensorless flux vector (SVC) mode using a standard induction motor without an encoder feedback signal.

2.08 PROTECTION

a.Circuit breaker coordination and short circuit protection shall eliminate the need for current- limiting and semiconductor fuses. Manufacture who require the use of semiconductor or current limiting fused will not be approved.

b.The AC Drive shall be UL 508C listed for use on distribution systems with [5,000 A,

10,000 A, 22,000 A, 65,000 A RMS] available fault current. The AC Drive shall have a coordinated short circuit rating designed to UL 508C and NEMA ICS 7.1 and listed on the nameplate. The AC Drive shall not create a hazard in the event of a short circuit at any point within the AC Drive when it is connected to a power source as specified on the nameplate and protected as specified in the instruction bulletin

c.Provisions shall be made to padlock the circuit breaker in the off position when the enclosure door is open.

d.Upon power-up the AC Drive shall automatically test for valid operation of memory, option module, loss of analog reference input, loss of communication, dynamic brake failure, DC to DC power supply, control power and the pre-charge circuit.

e.The Power Converter shall be protected against short circuits, between output phases and ground; and the logic and analog outputs.

f.The AC drive shall have a minimum AC undervoltage power loss ride-through of

200 msec. The AC Drive shall have the user- defined option of frequency fold-back to allow motor torque production to continue to increase the duration of the powerloss ride- through.

g.The AC drive shall have a selectable ride through function that will allow the logic to maintain control for a minimum of one second without faulting.

h.For a fault condition other than a ground fault, short circuit or internal fault, an auto restart function will provide up to 255 programmable restart attempts. The programmable time delay before restart attempts will range from 1 second to 999 seconds.

i.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.

j.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 speed settings or last speed.

k.The AC drive shall have solid state thermal protection that is UL Listed and meets UL 508C as a Class 20 overload protection and meets IEC 947. The minimum adjustment range shall be from .25 to 1.36% of the current output of the AC Drive.

l.There shall be three skip frequency ranges with a bandwidth of 5 Hz. The skip frequencies shall be programmed independently, back to back or overlapping.

2.09 ADJUSTMENTS AND CONFIGURATIONS

a.The AC Drive shall self-configure to the main operating supply voltage and frequency. No operator adjustments will be required.

b.Upon power-up, the AC Drive 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 when operating at a frequency between 20-60 Hz. The AC Drive shall automatically optimize the operating characteristics according to the stored data.

c.The AC Drive will be factory pre-set to operate most common applications.

d.A choice of three types of acceleration and deceleration ramps will be available in the AC Drive software; linear, S curve and U curve.

e.The acceleration and deceleration ramp times shall be adjustable from 0.1 to 999.9 seconds.

f.The volts per frequency ratios shall be user selectable to meet variable torque loads, normal and high-torque machine applications.

g.The memory shall retain and record run status and fault type of the past eight faults.

h.Slip compensation shall be a software- enabled function.

i.The software shall have a NOLD (no load) 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.

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09/2003