LZS power replacement and troubleshooting

Output wire: Use a temperature resistant 105 ° C wire and select a current carrying capacity of 150% of the rated load. The output terminal is a dangerous voltage, and the final device must not be touched by the user. The positive or negative pole of the output can be grounded.

Ventilation: The opening on the casing is used for ventilation and must not be blocked after installation.

Internal fuse: user cannot replace. If there is an internal malfunction, it must be returned to the manufacturer for repair.

Environment: Only applicable to environments with pollution level 2. The final equipment must provide mechanical and fire-resistant enclosures to prevent electric shock, fire, and hazardous energy.

3.2 Typical Local Sensing Connection (Figure 2)

Most applications use local sensing (i.e. adjusting voltage directly at the power output terminal). Connect the load to the+V and - V busbars, and connect the sensing jumper (usually included) between+V and+S, - V and - S. This way, the power supply will adjust based on the output voltage, ignoring the voltage drop in the circuit.

3.3 Remote sensing connection (Figure 3)

When the load is far away from the power supply and the line voltage drop is significant, remote sensing must be used. Connect the+S and - S wires directly to the positive and negative terminals of the load terminal. This way, the power supply will compensate for the voltage drop in the circuit, ensuring that the load terminal voltage is accurately at the set value. Attention: The total voltage drop between the output terminal and the load shall not exceed 1.0 V, and the output terminal voltage shall not exceed 29.4 V.

3.4 Input and output connection hardware

Input: Heavy duty terminal block.

DC output: heavy-duty busbar with 1/4 "(6.35 mm) clearance holes, comes with connecting hardware.

Auxiliary control and alarm signal: connected through a 15 pin D-sub female socket (chassis installation) and a 4-position rewirless terminal TB201 (can accept 14 AWG wire).

Remote programming and monitoring: achieving intelligent power management

LZS-A1000-3 provides rich remote control functions, enabling it to be integrated into automation systems, rather than just a simple power supply.

4.1 Remote output voltage programming

The output voltage can be remotely adjusted through external resistors or external voltage sources (instead of potentiometers on the panel). Connection point: pins 1 and 2 of TB201.

Resistance programming: 1000 Ω/volt. For example, to obtain a 24 V output, a 24 k Ω resistor is required. The voltage range corresponds to 18-29.4 V.

Voltage source programming: 1 V/volt. For every 1 V provided by the external voltage source, the output increases by 1 V. The external voltage source is connected between pin 1 (+) and pin 2 (-).

When using remote programming, it is necessary to place the local/remote selection switch (if any) in the remote position. Attention: Remote programming only controls the output voltage and does not affect the overvoltage protection setting value.

4.2 Remote On/Off

Through pins 6 and 7 of the "D" connector, TTL compatible signals can be used to control power output.

Logic '0' (below 0.7 V), short circuit or open circuit: disable output.

Logic "1" (above 2.5 V): Enable output.

Signal current: less than 4 mA at logic 1.

Output response time: Within 100 ms after applying logic 1, the output reaches the specification.

Enable switch: The "OUTPUT ENABLE" switch at the end of the chassis must be turned from the "LOCAL" position to the "REMOTE" position for the remote power on/off function to take effect.

Pin 6 and 7 are completely isolated from all other terminals (withstand voltage above 500 V) and can be safely connected to external control circuits.

4.3 Auxiliary monitoring and alarm signals (optocoupler conduction output)

These signals are optocoupler outputs that allow a maximum current of 1 mA when conducting, with a voltage drop of<0.4 V. They can be used to drive LED or PLC inputs.

Input Power Good: When the input capacitor voltage is sufficient to maintain a 10 ms power-off holding time, this signal conducts. Even when remotely disabling output (AC still present) or shutting down due to overheating, this signal will still be asserted (indicating normal AC input but no power output).

Output Good: Conducts when the output voltage exceeds its minimum specified value (approximately 95% of the set value). If the output is under voltage, over voltage, or the power is in standby mode, the signal will be disconnected.

Inverter Good: When the internal inverter of the power supply is working normally, it conducts. Under extremely light loads, the signal may be uncertain.

These signals have a minimum isolation voltage of 500 V between the power output and other signals, and an isolation voltage of 3000 V AC from the AC input.

4.4 Synchronization Signal (Sync)

The "D" connector provides an auxiliary signal (power switch frequency) of approximately 200 kHz, which can be used to synchronize other devices.

Parallel and series operation: expanding power or voltage