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Mulview CCTV-FAQ

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power supply FAQ
Power Supply
6. When testing a dual output power supply, the +5V channel is correct, but the +12V channel is over the specification. What is going on?

Ans:
There are some minimum-load requirements on Mulview’s multi-output power supplies, please refer to the specification first before connecting the load. When the load condition is 5V/4A, 12V/0A, the output voltage of the 12V
channel will be around 12.8V that is over the ±6% of voltage deviation (12.72V) specified in the spec. sheet. If we add in the minimum load 0.2A to the 12V channel, the 12V channel will reduce to around 12.3V which is within the
specification.

7. Why I can not turn on the power supply smoothly when the loads are motors, light bulbs or capacitive loads?

Ans:
If you connect the S.P.S. to motors, light bulbs, or high capacitive loads, you will have a high output surge current when you turn on the S.P.S. and this high surge current will cause failure of start up. We suggest using S.P.S. with constant current limiting protection to deal with these loads.


8. Why did the power supply shuts down during operation and after turning it off, I can restart the power supply again?

Ans:
In general there are two circumstances that will cause the power supply to shut down. The first one is the activation of the over-load-protection (OLP). To deal with this situation, we suggest increasing the rating of the output power or modifying the OLP point. The second one is the activation of over-temperature protection (OTP) when the internal temperature reaches the pre-set value. All of these conditions will let the S.P.S. enter protection mode and shut down. After these conditions are removed, the S.P.S. will be back to normal.

9. The output ground (GND) and frame ground (FG) is the same point in my system, can Mulview’s power supplies be used in such system?

Ans:
Yes. Since our products are designed based on isolation concept, it will be no problem that the output ground (GND) and frame ground (FG) is the same point in your system. But, EMI may be affect by this connection.

10. During the operation of Mulview power supply, there is some leakage current on the case. Is this normal? Will this leakage current hurt human body?

Ans:
Due to the requirement of EMI, there will be some Y capacitors between line and neutral to the FG (case) to improve EMC. These Y capacitors will cause some leakage current flow from line or neutral to the case (normally case will be connected to earth ground). For example, IEC-60950-1 requires that this current should be less than 3.5mA for IT equipment, so basically the leakage current you find on the case will not hurt human body. Proper connection to
Earth ground will solve the leakage current problem.

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