HZC-4080 provides four triggering modes: internal power supply triggering, external power supply triggering, auxiliary contact triggering, and sensor triggering (manual switch). Many engineers only found out on site that the "trigger method" was not selected correctly, either the switch did not move, or if it moved, there was no data. Clearly explain the applicable scenarios for the four methods to save time on site.

Internal power trigger (most commonly used)

The instrument is equipped with an adjustable DC power supply ranging from 0 to 270V/20A, which directly supplies power to the closing (opening) coil of the circuit breaker. At the same time, the timing starts from the moment the coil is powered on.

Applicable conditions: The tested circuit breaker is a DC operating mechanism with a coil driving current not exceeding 20A. This is the most standard testing method, with the simplest wiring and most accurate data.

Attention: Before using the internal trigger, the control power supply inside the control box must be disconnected (disconnect the control bus fuse), but the energy storage power supply cannot be cut off (the spring energy storage motor requires power supply).

External power supply external trigger (for complex situations)

The instrument does not output control power, and the circuit breaker action is controlled by the operating power supply in the on-site control room. The "external trigger" wiring of the instrument is connected to both ends of the closing (opening) switch coil. When the coil is powered on, the instrument detects a voltage signal from the coil, which serves as the starting point for timing.

Applicable conditions:

Circuit breaker is an AC operating mechanism (the instrument can only provide DC internally)

The current of the closing coil of the electromagnetic circuit breaker can reach up to 100A or even several hundred amperes, far exceeding the upper limit of 20A of the instrument, and needs to be controlled by the on-site closing contactor

When imported switches such as Siemens and ABB have protective locks that cannot be directly driven by instruments

When using an external trigger, the opening and closing control line is not connected, only the external trigger line is connected

Auxiliary contact triggering

When there is no electrical signal available on the coil (such as some special switches), use the action signal of the circuit breaker auxiliary contact as the starting point for timing. Suitable for special situations where it is not possible to obtain the coil power signal, with slightly lower accuracy than direct coil triggering.

Sensor triggered (manual switch)

For manually operated switches (without electronic control mechanisms), the electrical signal on the coil cannot be obtained. Instead, the sensor detects the action as the starting point for timing. Connect the fracture line and sensor, wait for the instrument, and manually operate the switch to automatically collect data.