TVM中文资料力特数据手册PDF规格书

描述 Description

The TVM Series Provides protection for motors and other

sensitive loads. Continuously measures the voltage of each

of the three phases using a microcomputer circuit design

that senses under and overvoltage, voltage unbalance, phase

loss, and phase reversal. Protection is provided even when

regenerated voltages are present. Includes a trip delay to

prevent nuisance tripping and a restart delay to prevent short

cycling after a momentary power outage.

Operation

Upon application of line voltage, the restart delay begins.

The output relay is de-energized during restart delay. Under

normal conditions, the output energizes after restart delay.

Undervoltage, overvoltage, and voltage unbalance must be

sensed for continuous trip delay period before the output is

de-energized. The output will not de-energize if a fault is

corrected during the trip delay. The restart delay begins as

soon as the output relay de-energizes. If the restart delay is

completed when the fault is corrected, the output relay will

energize immediately.

The output relay will not energize if a fault or phase reversal is

sensed as 3-phase input voltage is applied.

Reset: Reset is automatic upon correction of a fault.

LED Operation

The LED flashes green during the restart delay, then glows

green when the output energizes. It flashes red during the trip

delay then glows red when the output de-energizes. It flashes

red/green if phase reversal is sensed.

FEATURES BENEFITS

Proprietary

microcontroller based

circuitry

Constant monitoring to protect against phase loss,

phase reversal; over, under, and unbalanced voltage;

short cycling

Compact design

measures 2 in.

(50.8mm) square

Perfect for OEM applications where cost, size and

ease of installation are important

LED indication Provides diagnostics of relay, fault and time

delay status

Encapsulated Protects against shock, vibration and humidity