PULS QS40.241 Power Supply Practical Guide

For multi strand wires, it is recommended to use ferrite terminals and ensure that all wire cores are fully inserted into the terminal holes.

2.4 Special Requirements for Explosion proof Zone (ATEX Zone 2)

Only applicable to Class I Division 2 Groups A, B, C, D or II 3G Ex ec nC IIC T4 Gc environments.

It is strictly prohibited to plug or unplug any connectors, adjust voltage, or switch "Parallel/Single" jumpers while powered on.

The final product must provide an IP54 or higher shell and comply with EN 60079-0.

Any replacement of components may compromise the explosion-proof suitability.

Detailed explanation of electrical performance and parameter interpretation

3.1 Input Characteristics

Startup/shutdown voltage: Typical startup voltage is 80Vac, shutdown voltage is 74Vac (hysteresis prevents jitter).

Input current: Typical 4.5A at 230Vac full load. Power factor up to 0.99, current crest factor 1.53, minimal harmonic interference to the power grid.

Start delay: After power on, the output reaches stability within about 800ms, with a rise time of about 15ms and no overshoot (<100mV).

3.2 Output Characteristics

The output voltage of QS40.241 can be adjusted between 24-28Vdc through the multi turn potentiometer on the front panel. The factory setting is 24.1V (full load, chiller, Single Use mode).

Key parameters:

Load adjustment rate: In Single Use mode, the voltage drop from 0A to 40A is ≤ 50mV; in Parallel mode, the drop is about 1000mV (for current sharing).

Ripple noise:<100mVpp (20Hz-20MHz), meeting the requirements of the vast majority of PLCs and sensors.

Output capacitor: Built in approximately 10200 μ F, providing additional transient energy.

3.3 BonusPower and HiccupPLUS modes

This is the most unique feature of QS40.241. When the load exceeds 960W (e.g. 1440W) for a short period of time, the power supply will not immediately turn off, but will continue to provide current (constant current mode) for up to about 4 seconds (typical value). This time is sufficient to initiate most inductive or capacitive loads. If the overload persists after 4 seconds, the output voltage will drop below 20V, and then enter HiccupPLUS mode: the output will be turned off for about 17 seconds, and then automatically restarted to attempt. If the overload is eliminated and restored to normal; If the overload persists, output again for 2-4 seconds and then turn off, repeating this cycle. During the shutdown period, there is still a small voltage and current output (about 0.5W).

Attention: BonusPower is available immediately after each startup or short circuit fault is resolved, without waiting for cooling.

3.4 Peak current capability

In addition to BonusPower (60A lasting for 4 seconds), QS40.241 can also provide a peak current of up to 110A (lasting for 10ms) for:

Quickly trigger the magnetic trip of downstream MCB (see Chapter 5).

Charge loads with large input capacitors, such as drivers and frequency converters.

When the peak of 110A occurs, the output voltage will drop from 24V to about 18.9V (80A/50ms) or even 13.8V (200A/5ms). The DC-OK relay will activate when the voltage drop exceeds 10% and lasts for more than 1ms, which is normal during peak current periods.

Protection functions and safety features

Protection type implementation method parameters

Output overload constant current limit+HiccupPLUS constant current>60A, then burp

Output short circuit with the same average effective current of about 23 A as above

Output overvoltage OVP clamp (typical 30V, maximum 32V) automatically shuts off, requiring power-off reset

Over temperature protection: Internal temperature sensor shuts off output, red light flashes

Input transient MOV varistor absorbs surge

The internal input fuse is built-in and cannot be replaced. The rated value is matched according to the standard

Safe isolation: Double/reinforced insulation is used between input and output, and the output is SELV/PELV (safe extra low voltage), which can be directly touched. But one end of the output (positive or negative) must be connected to the protective ground to comply with PELV requirements.

Leakage current: Typical 0.9mA (TN/TT system) or 2.25mA (IT system) at 230Vac, with maximum values of 1.18mA and 2.82mA, respectively.

Parallel, redundant, and series configurations (common engineering requirements)

5.1 Parallel connection increases output power

Multiple QS40.241s can be connected in parallel to achieve a higher total current (e.g. up to 80A for two parallel connections).

Operation steps:

Place all power sources in "Single Use" mode (with jumper wires not inserted or removed).

Adjust each output voltage to the same value (± 100mV), preferably under the same load conditions.

Insert the "Parallel Use" jumper for all power supplies (switch to parallel mode). This mode will cause the no-load voltage to be about 4% higher than the full load voltage, thereby automatically achieving current sharing.

Simultaneously power on to avoid entering Hiccup PLUS mode for a single device.

The installation gap on both sides should be kept at least 15mm, and it is strictly prohibited to stack them up and down.