AMX AXU-CA10 User Manual download pdf (Page 2)

Bulletin 150

Smart Motor Controllers — SMC-3™

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Description of Features

Electronic Motor Overload Protection

The SMC-3 controller incorporates, as standard, electronic motor

overload protection. This motor overload protection is accomplished

electronically with the use of current transformers on each of the

three phases. The controller’s overload protection is programmable,

providing the user with flexibility. The overload trip class selection

consists of either OFF, 10, 15, or 20. The trip current is easily

selected by adjusting the rotary potentiometer to the motor full load

current rating. Trip reset is selectable to either automatic or manual

mode.

Note: Trip rating is 120% of dial setting.

Over-temperature

The SMC-3 monitors the SCR temperature by means of internal

thermistors. When the power poles maximum rated temperature is

reached, the microcomputer switches off the SMC and a TEMP fault

is indicated via LED.

Phase Reversal Protection

When enabled via a DIP switch, 3-phase input power will be verified

before starting. If input power phasing is detected to be incorrect,

the start will be aborted and a fault indicated.

Phase Imbalance

The unit monitors for imbalance between phase currents. To prevent

motor damage, the unit will trip if the phase imbalance exceeds

specified limits and a fault will be indicated on the LED.

Shorted SCR

Prior to every start and during starting, the unit will check all SCRs

for shorts and unit load connections to the motor. If there is a

shorted SCR in the SMC-3 and/or open load, the start will be

aborted and a shorted SCR or open load fault will be indicated. This

prevents damage from phase imbalance.

Phase Loss/Open Load

The unit will not attempt a start if there is a single-phase condition

on the line. This protects from motor burnout during single-phase

starting.

Soft Stop

The Soft Stop function can be used with applications that require an

extended coast to rest. When enabled, the voltage ramp down time can be

selected to one, two, or three times the starting time. The motor will stop

when the motor voltage drops to a point where the load torque is greater

than the motor torque.

Modes of Operation, Continued

Push to Test

The unit with control wiring can be tested for fault conditions by

using the Push to Test function. Hold down the Reset button for 5

seconds to activate the fault Aux (97, 98) and shut down the SMC-3.

To clear, either push the Reset button or cycle control power to the

device.

Modes of Operation/Features

LED Description (Number of Flashes)

1. Overload

2. Overtemperature

3. Phase Reversal

4. Phase Loss/Open Load

5. Phase Imbalance

6. Shorted SCR

7. Test

1 2 3 ... 24

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AMX AXU-CA10 User Manual Page 2

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