A-T Controls TRIAC TDC-100B Installatie- en bedieningshandleiding - Pagina 8

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STALL DETECTION FEATURE

The Stall Detection feature of the TDC-100 (see FAULT

INDICATORS) essentially performs a similar function as

commonly used torque switches;

differences should be considered before eliminating the

torque switches. The TDC-100 feature does not measure

torque, but rather motion; if the load is sensitive to

excessive torque, the torque switches may be desirable.

Since common torque switches are mechanical devices,

they can provide a fail safe feature in the event of

electrical failures (such as shorted wires or damage to the

TDC-100).

The Stall Detection feature is useful for detecting when

any of the motor wires become disconnected. However,

limit

switches

employed

disconnect one of the motor windings. The TDC-100 will

detect this as a motor stall. To avoid this condition, the

limit switches must be set outside of the operating range

set by the CLOSE and OPEN functions.

ELECTRONIC BRAKE FEATURE

The Electronic Brake feature of the TDC-100 provides

highly reliable and accurate braking of the motor, and it is

a key element in achieving high resolution. A mechanical

brake can still be implemented without interfering with the

TDC-100 operation. Mechanical brakes can be useful for

providing a holding brake in the event power to the

actuator is lost.

Since the Electronic Brake feature provides the primary

braking of the motor, the life of a mechanical brake is

dramatically extended.

Control

feature

compensates for changes in a mechanical brake's

performance due to temperature or age.

www.atcontrols.com



however, the

actuators

essentially

Additonally, the Adaptive

the

TDC-100

automatically

Note that the actuator's limit switches should be set

outside of the operating range set by the CLOSE and

OPEN functions. The Electronic Brake feature degrades

in performance if a limit switch is engaged. Limit switches

exhibit wide variations, and the TDC-100 can position the

actuator more precisely at closed and open than the limit

switches. A limit switch serves better as a fail safe device

to protect against electrical failures in the actuator.

DUTY CYCLE CONTROL FEATURE

The Duty Cycle Control feature of the TDC-100 allows

actuators rated at 25% duty or more to be safely used in

automated valve applications. The TDC-100 accurately

monitors the relative heating of the motor and

automatically duty cycles the unit at a safe level when a

process becomes unstable, or if a control loop is not

properly set.

While the thermal switch in the motor

protects the motor from overheating, thermal switches

can shutdown the actuator for ten minutes or more.

Further, typical thermal switches do not activate until

temperatures inside the actuator become too high for

other components in the actuator.

The Duty Cycle Control feature allows continuous

operation of the motor until it detects an excess heat

buildup in the motor (usually well below the limit of the

thermal switch).

automatically enabled and continues until the motor cools

enough to resume continuous operation. The duty cycle

period is approximately 2 seconds with an on time that

automatically various depending on the heating of the

motor. While this operation slows down the actuator's

operation, it does not impact the resolution performance

of the TDC-100, and it prevents disruption of a process

due to a thermal switch shutdown.

TDC-100 Series

AC Digital High-Resolution Controller

Installation & Maintenance Manual

At that time, duty cycle operation is

IOM08032 REVISION 01

07/24/20