Schneider Electric 58 TRX

Altivar® 58 TRX AC Drives

Assignment of Logic Inputs (LIx)

Controlled Stop Functions

The Controlled Stop functions provide alternate stopping methods to the normal drive controller stop.

Normally, the drive controller follo ws the decele ration ramp on a command to stop . To use the Controlled

Stop function, one logic input (LI) must be assigned. The input is active at state 0 (open) f or a Free wheel

Stop or Fast Stop, and is active at state 1 (closed) for DC Inje ction Brak ing. These sto p requests alw ays

have priority over a normal stop or a Run signal. Three controlled stop methods are available:

• Freewheel Stop/Run Permissive

The drive controller output is turned off and the motor coasts to a stop according to the inertia and

resistive torque of the load. This method is often used in applicati ons whe re Run Permissive is used

as an electrical safety device.

•Fast Stop

Braking with deceleration ramp time divided by a coefficient adjustable from 1 to 10. This method is

often used for materials handling applications and provides the quickest way to stop without

additional hardware.

• DC Injection Braking

Adjustment of time (0 to 30 s, preset at 0.5 s) and current (10% to 136% of nominal controller current

in a high-torque application, preset at 70%). It is possible to set continu ous brakin g current from 10%

to 100% of nominal motor current (factory setting is 50%). After 30 s, the current automatically goes

to 50%. This method is often used for applications invol vi ng fans since it eliminates the need for the

addition of a braking resistor.

Note that after a stop (frequency less than 0.1 Hz), DC Injection Braking may be combined with the

other methods. For this situation, only the current injected after 30 s can be adjusted.

Switching Between Two Motors

This function allows a single drive controller to control two motors with different power ratings, on e at a

time. Activating this parameter automatically scales the DC in jection curre nt, brak e release c urrent, and

nominal motor current based on a programmable scaling factor and the larger motor parameters that

have been configured. This function inhibits motor thermal protection of the second motor. External

contactor control for both motors and external motor thermal protection f or the seco nd motor is requir ed

for using this function.

Freewheel Stop Below Selectable Frequency

This parameter allows the drive controller to freewheel stop below a programmable frequency. After a

stop command is received and the drive has followed the deceleration ramp to the programmed

frequency, the drive controller output is turned off a nd the motor c oasts to a stop a ccording to the i nertia

and resistive torque of the load.

Torque Limit by Logic Input (Constant Torque Rated Products)

This function allows a logic input to be assigned a second level of torque limit. The associated torque

level is factory set at 200% and is adjustable f rom 0-200% of the drive controller constant torque rating.

When the assigned logic input is closed (set to state 1) the maximum torque is limited to the configured

value. This feature can be used in the following type of applications:

• At the end of a material handling cycle when it may be useful to stall the motor as the load meets a

barrier.

• Cut-to-length applications with the material stopped while maintaining som e motor torque to hold the

material.

(

)

1234

CntrlStop.eps

1 = Fast Stop

2 = DC Injection Braking

3 = Normal stop on dec. ramp

4 = Freewheel Stop

Controlled Stop

Diagram