FAQs

It is the reserve power available constantly that allows reliable startup of loads with high inrush current.

In our product portfolio there are two DIN-Rail Power Supply series CliQ & CliQ II. Both series have this feature.

  1. CliQ has 150% boost for 3 seconds
  2. CliQ II has the same 150% boost for 5 seconds
Such feature is especially useful for applications where loads are active; the high current can cause the power supply unit (PSU) output to dip down if the PSU does not have the capability to withstand this surge current. Consequently, this could reset the system and result in equipment downtime.
For example, in an EV charging terminal, the power supply is powering all the controls and safety electronics. In such a system there could be up to ten DC/DC converters and POLs. Each converter has an inrush current and all DC/DC converters are connected in parallel. Therefore the total inrush current is the multiple of all the DC/DC converters. Delta's Power Boost of 150% up to 5 seconds helps to reduce the need for active inrush limiters and/or avoid sequence power on.
  1. O/P Load Power
  2. I/P Type
  3. Efficiency and Reliability

Efficiency and Reliability are the two most important factors to consider in selecting a PSU.

The best way to ensure the reliability of the PSU is to choose one that provides a maximum of 30% more output than your actual total requirement. For example, if your system has a 90W power requirement, you should choose a PSU with at least 120W power output rating. By doing so, you are boosting the reliability of the PSU as well as prolonging the entire system life.

An efficient PSU will thus ensure that power loss is minimised and will greatly help to lower your operating costs in the long run. By choosing a cheaper, but less efficient PSU will just mean that you are paying for it through your monthly electric bills. Delta's CliQ Din-Rail Power Supply easily give our users a substantial efficiency of up to 87%.Other factors to consider include the operating conditions, types of safety certifications, PSU protection and application functions. Please contact your nearest Delta sales representative for a recommendation based on your requirements.

Yes. Add a Diode across each power supply in reverse bias with a voltage rating at least twice the rated o/p voltage. The current rating of diode must be at least twice the rated current or above.

Answer: The turn ON would be non-monotonic as the power supply with the fastest startup time and rise time will turn on first. As a result, the startup waveform with 2 power supplies connected in series would see a step.

Yes. However, the maximum load current should not exceed the smallest rated power.

Yes. However, an Oring Diode is necessary to ensure that an increased output rating in parallel operation. Please refer to the manual included with your power supply for more details.

  • For 12V Series; Recommended the Oring Diode
  • For 24V and 48V Series; Recommended the DRR Series. (Redundancy Module)
Answer: Delta's CliQ DIN Rail Power Supplies are designed based on the isolation concept (1.5KVac isolation between Sec & FG). In the event where the output Gnd and frame Gnd are shorted at the system end, this short will not cause any fuse damage or functional harm to the power supply. However, the EMI could be affected by this.
No, this is not recommended. What we know from the Industrial PS background that it needs to have isolated gnd. In a complete system, there are many components such as VFDs, Servos, Motors, and Contactors which are all switching devices. They will generate a large amount of harmonics if the output ground is tied to FG then the noise from these would possibly get coupled with PS and if the PS is supplying the power to PLCs, Analog devices are susceptible to these noises.
Yes. There is a direct impact on the output power rating. We would recommend installing PSU in a vertical orientation to get better performance. More details can be found in your manual.
MTBF means "Mean Time between Failures". It is a indicator of reliability. Therefore, the higher the MTBF, the more reliable the product is.
Each time the power supply is turned on; there will be a large "Inrush Current". This is the inherent property of all Switching Power Supplies. Depending on the design, the Inrush current is limited to 40A, 60A or 80A. It will return back to its normal current rating immediately. Although the inrush current is high it will not damage the supply as the internal components are designed to handle these large pulse currents but it is not advisable to switch On/Off the PS very frequently as this may cause the AC Source circuit breaker to get into protection mode due to large Pulse current.
Yes, because Delta's power supply is certified for ITE Standards, it can be used with IT products.
No. Delta's CliQ DIN Rail Power Supply has a built-in auto restart function, unlike all other competitors.

PFC stands for Power Factor Correction. The purpose of PFC is to improve the ratio of apparent power and real power. PFC is needed in the power supplies which have more than 75W input power. For example, a 60W PSU with 80% efficiency and a power input of 75W will need a PFC (based on EMC requirements IEC-61000-3-2). However, if the 60W PSU has more than 80% efficiency, about 82% then the Pin is 73W PFC is not needed.

The power factor is only 0.4~0.6 in non-PFC models. In PFC models, the power factor can reach above 0.95.

The calculation formulas are as below:

Apparent Power=Input Voltage x Input Current (VA)

Real Power= Input Voltage x Input Current x Power Factor (W)

The electric power plant needs to generate a power which is higher than apparent power in order to steadily provide electricity to the market. The real usage of electricity should be defined by real power. Assuming the power factor is 0.5, the power plant needs to produce more than 2VA to satisfy 1W real power. On the contrary, if the power factor is 0.95, the power plant only needs to generate more than 1.053VA to provide 1W real power need. It will be more effective to have PFC keeping environment friendly point of view and energy conservation. CliQ DIN Rail Power Supply's 120W, 240W & 480W single phase power supply have this PFC feature. The 60W model needs the PFC feature if the input power exceeds 75W.

Delta's range of power supply gives our users a good performance to price ratio. Our features include high efficiency, high MTBF, universal AC input and a wide operating temperature range.
Yes. CliQ DIN Rail Power Supply is designed with universal input range from 100-240Vac and operating voltage range from 85vac to 264Vac.
Delta's CliQ DIN Rail Power Supplies are protected against such accidents. In such an event, the power supply will go into Auto-Recovery mode or Hiccup mode. It will automatically restart and resume normal operation once the short circuit is removed.
The power supply will go into protection mode with an Auto-Recovery feature (or Hicc-Up mode). This means that the power supply will restart automatically.

If the power supply is over-loaded beyond the overload protection limit, it will into the protection mode i.e. output voltage will fold back and go into auto recovery (hicc-up mode).

Typically there is no defined time for short circuit intervals but we do not expect the user to short circuit the power supply regularly or at short intervals unless it is due to system error or malfunction. Even so, the power supply unit will still be protected.

Delta's 3-phase power supply allows for a wide range of input operating voltages.

This range from 320Vac to 575Vac with a nominal range of 400Vac to 500Vac.

To operate normally, the power supply will require a minimum 2-phase input voltage of 360Vac unlike a minimum 320Vac for a 3-phase power supply. For higher powered models such as the 480W and above, the min 2-phase input voltage is 380Vac. In case the minimum input is lower than this, there will be a power derating. Please contact your nearest sales representative for more details.
The maximum input surge voltage is 300Vac for 0.5 seconds.
We do not recommend installing 2 power supplies side by side. Each power supply should maintain a minimum distance of 20mm from each other.
CliQ DIN Rail Power Supply is designed for various loads. However, before using for an inductive load, we recommend to verify the output surge current. If the output surge current is higher than power supply specifications, which is at 150% for 3 seconds, this will cause the power supply to jump into hiccup mode during start up.

The LED is directly connected across the output voltage (LED in series with current limiting resistor). The LED will turn ON as soon as the power supply is switched on.

The LED will turn off under the following conditions:

  1. When the AC Supply is turned off or not present.
  2. The LED is faulty.
  3. The output voltage is faulty or not present

The LED light will be blinking when it is in the hiccup protection mode.

Delta's CliQ DIN Rail Power Supply 3-phase power supply can work without any power derating even with only 2-phase inputs. However, the 2-phase input voltage must be at least 360Vac (L-L). For higher powered models such as the 480W, the minimum 2-phase input voltage is 380Vac. On the higher side our power supplies can work up to 575Vac.You can use either L1-L2 or L1-L3 or L2-L3 terminals. This input will be 2-Phase with 1-phase missing.
The range is given for the choice of power circuit-breaker to be used for different models. During the safety tests, Delta follows the recommended value advised by safety agencies i.e. 16A min. This is because during safety failure tests, we depend on the power supply fuse to blow rather than the power circuit-breaker to open. But if a lower value power circuit-breaker is used, the power circuit-breaker will trip before the fuse is open thus avoiding the field returns. Therefore we do not recommend using the fuse instead of the power circuit-breaker as the backup.
100A for the 240W single-phase power supply. 150A for the 480W single-phase power supply.
No. The power supply can be installed horizontally or vertically. However, it is recommended to have at least 20mm spacing from other equipment to ensure sufficient ventilation.
No. Delta's PMC power supply has a built-in auto restart function, unlike all other competitors.
Delta's range of power supply gives our users a good performance to price ratio. Our features include high efficiency, high MTBF, universal AC input and a wide operating temperature range.
Yes. PMC power supply is designed with universal input range from 100-240Vac and operating voltage range from 85vac to 264Vac.
Delta's PMC power supplies are protected against such accidents. In such an event, the power supply will go into Auto-Recovery mode or Hiccup mode. It will automatically restart and resume normal operation once the short circuit is removed.
No. The maximum ambient operating temperature for PMC power supply is 70°C. Please refer to the power derating curve in the manual for more details.
The maximum input surge voltage is 300Vac for 0.5 seconds.
Please refer to the manual for details on the ORing Diode and its connection.
Currently, both Delta's PMC and CliQ power supply are certified as Built-In Product hence they do not come with IP level protection. However, Delta will be introducing a new range of CliQ power supply with IP20 protection rating.
Yes. They are RoHS compliant.
Within a multiple loads connection, Advanced Power Boost (APB) can detect a faulty current path and provide a large outrush current to trip the circuit breaker connected to the faulty path. This prevents the system from shutting down while the other connected current paths continue to operate without interruption.
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