Use the PDU according to its calibrated electrical parameters, don't overload, don't change the wiring, don't rain or moisture or overheating. When using the PDU power cord to open the tie, try not to twist and twist, so as not to cause fire due to the heating of the wire.PDU use must be connected to the power input ground, make sure that the ground is fully conductive, to prevent the danger of touching the leakage of electricity.

Channels for purchasing PDUs:

A: Integrator: familiar with the equipment condition of the machine room, complete matching, overall settlement, high price.

B: Equipment retailers: with its sales equipment such as: servers, routers, switches, etc., can accurately match the jack form and power parameters, and the equipment package settlement, the price is medium.

C: Cabinet factory: Cabinet factory is a sheet metal factory, no production qualifications for electrical devices, especially cabinet factory branded PDUs, poor quality control and product changes, price confusion, mixed, not easy to identify, but easy to install. Package settlement with cabinet.

D: Professional power supplier: such as the column head distribution cabinet, PDU professional sellers, you can get professional guidance and help, customized flexibility, configuration specifications, high security, low price, but to separate settlement.

3: What brand of PDU to buy?

A: International brand: complete certification, quality assurance; However, the price is high, the delivery cycle is long, it generally takes 6-8 weeks, the jack form is single, and the compatibility with the equipment plug is poor, it is a standard model product, and it cannot be customized.

B: Domestic high-end brands: complete parts certification, complete factory qualifications, one-by-one factory inspection, medium price (equivalent to 1/3~1/2 of international brands), complete service, high degree of product customization.

C: Domestic low-end miscellaneous brands: parts certification is incomplete, quality stability is not high, most of them are speculative small factory pieced together products, factories are not qualified or under the guise of others' qualifications, parameters are chaotic, bold behavior, some can also be customized, the price is very low. Instead of using this kind of PDU, it is better to use an authentic high-end brand cable tray.

4: How to identify PDUs?

A: Qualification: The selection of PDU first look at the manufacturer's qualification: factory certification documents to ensure the reliability of processing;

The second look at the qualification of the product: testing documents, product specifications, identification nameplates, etc., to ensure the standardization of the product.

B: Experience: PDU is a customized product for the power distribution of the equipment room, and the experience value of matching the power consumption of the equipment room is the most valuable, so the manufacturer's years of employment is an important indicator to test the stability and professionalism of the PDU product.

C: Pre-sale guidance: there is no pre-sale guidance is an important sign of whether the PDU manufacturer is professional, if you do not have professional guidance in the selection and customization time, you will pay the painful cost of the later period: the equipment can not use electricity, the power match is insufficient, the ground is poor, and even burn the equipment, the power supply line interruption will also be accompanied.

Professional pre-sales guidance will focus on the following aspects:

1) Confirmation of equipment power and equipment plug form

2) Confirm the number and installation status of the devices in the cabinet

3) Confirm the output current and phase balance of the distribution cabinet

4) Confirm the connection form and distance of PDU front end

5) The difference between the UPS circuit and the bypass mains line

First of all, you should first calculate what devices are put in your cabinet (or what devices may be used), and calculate how many jacks are needed. What plugs are the devices? (What plug with what socket, GB2099.3 million socket can use IEC60906 American standard plug and GB1002/10A three-flat plug and BS1363 British standard plug, although GB2099.3 compatibility is good, but in the high current operation, It is best to use a professional supporting socket), only accurate calculation can avoid waste and insufficient.

Second, consider what control and protection functions you want the PDU to have (such as overload protectors, surge protection filtering functions, etc.), how you want to install it in the cabinet (usually standard 19-inch and vertical extension PDUs, etc.), how much space is occupied and how to install it.

Thirdly, through the statistics of the overall rated working status of the equipment in the cabinet, the appropriate value of the PDU should be able to carry power is calculated.

Example 1: Concerns on PDUs in different periods of equipment room construction:

A: Planning period selection: Many equipment room bidding and bidding did not put the PDU and UPS, column head cabinet, cabinet and other equipment as a single column, the PDU parameters are very unclear, and even some only indicate the power strip, which will cause a lot of trouble for the later work: can not match with other equipment, non-standard power distribution, budget is seriously insufficient.

The main reason for this phenomenon is that both bidders are not clear about how to label the PDU requirements.

Here's a simple way to do it:

1) Circuit power of the distribution branch of the front cabinet + safety margin = the sum of power of PDUs on this line

2) Number of devices in a cabinet + safety margin = number of jacks of all PDUs in a cabinet.

If there are two redundant lines, the number of PDUs should be doubled.

3) Distribute high-power devices in different PDUs as far as possible to balance the current of each phase;

4) Customize the PDU pass based on the device plug whose power cord cannot be separated. If the device plug whose power cord can be separated is incompatible, replace the power cord to solve the problem.

5) With high device density in the cabinet, it is advisable to install PDUs with multiple jacks vertically.

Because the device density in the cabinet is low, it is recommended that PDUs be installed horizontally with fewer jacks

Finally, PDU should be given a separate quotation budget to avoid serious budget shortage

B;  Installation and commissioning period:

1) The power of the power distribution socket in front of the cabinet must match the power of the distribution branch circuit of the front cabinet and the power distribution unit (PDU). Otherwise, the power specifications will be reduced

2) When installing a horizontal PDU, reserve the PDU installation U bit.

Vertical PDU When installing a cabinet, ensure that the positions of the horizontal plates on the side of the cabinet are consistent with the dimensions of the PDU.

3) The double round European standard plug can not be directly inserted into the multipurpose hole, so the ground will be suspended, very dangerous;

The correct way is to replace the plug or use the embedded European standard jack, and no longer use the European standard to convert the national standard special conversion line.

C: Operation period:

1) Pay attention to the temperature rise index, that is, the temperature change between the device plug and the PDU jack;

2) If there is a remote monitoring PDU, you can pay attention to the current change of the PDU to determine whether the device is working normally.

3) Make full use of the PDU cable management device to decompose the outward breaking force of the device plug to the jack.

(1) Interface compatibility:

The power socket hole module of the world's standard can meet the different needs of multinational customers with multi-purpose output jack and IEC output socket, which is suitable for the plug of different imported instruments and equipment in many countries. (Plug standards vary from country to country, please check before purchase)

1). Can achieve double input, IEC socket input, product front panel input, product rear input, product end input and other forms.

2). With a variety of specifications of national standard, universal, IEC320(C13C14C19C20), British standard, German standard, American standard, Indian standard.

3). Optional 10A, 16A, 32A, 63A industrial coupler (anti-splash plug anti-splash socket) and other specifications of plugs.

(2) International standard rack mount installation:

It can be easily installed on a 19-inch standard cabinet or rack, occupying only 1U cabinet space. It supports horizontal installation (standard 19-inch) and vertical installation (parallel to the cabinet column).

(3) Convenient and reliable installation performance:

The standard 19-inch design makes installation very easy. At least two screws are needed to secure the PDU. The PDU can be adjusted 180 degrees as required. The special L-shaped bending plate can also be used to adjust the PDU product by 90 degrees.

(4) Multiple circuit protection functions and management monitoring functions:

Lightning, surge protection: maximum impulse current: 20KA or higher; Limit voltage: ≤500V or lower; Through the professional testing of lightning protection test center, it can be used as fine surge protection at the equipment end

Alarm protection: LED digital current display and full current monitoring with alarm function

Filter protection: with fine filter protection, output ultra-stable pure power supply

Overload protection: provides bipolar overload protection, which can effectively prevent problems caused by overload.

Anti-misoperation: The ON/OFF switch of the PDU main control unit is equipped with a protection grid to prevent unexpected shutdown and provide optional dual switches

Leading edge in modular design

Voltage display: The PDU itself displays voltage

Temperature and Humidity display: Displays the temperature and humidity around the cabinet

Remote management control function

PDU power delayed start or a single jack time sharing start control function

(5) High-current and high-load dual backup function

The total PDU load can be adjusted according to user requirements. The maximum current can reach 100A, and the maximum power can reach 24000W. Dual power backup can be performed according to user requirements.

(6) There are several forms of PDU input

There are generally 3 kinds:

1. Input a single line

2. Input two lines

3.IEC320 input

(7) "on the cabinet"; U" What does that mean?

U is a unit that represents the external dimensions of the server. It is an abbreviation for unit, and the detailed dimensions are determined by the U.S. Electronics Industry Association (EIA), an industry group.

The reason for specifying the size of the server is to maintain the appropriate size for the server to be placed on an iron or aluminum rack. The rack has a screw hole for fixing the server, so that it can be matched with the screw hole of the server, and then fixed with screws to facilitate the installation of the space required for each server.

The specified dimensions are the width of the server (48.26cm = 19 inches) and the height (multiple of 4.445cm). Because it is 19 inches wide, a frame that meets this requirement is sometimes referred to as a "19 inch frame." The thickness is 4.445cm as the basic unit. The 1U is 4.445cm, and the 2U is 8.89cm, twice the size of the 1U.

The so-called "1U PC server" is a product with a shape that meets EIA specifications and a thickness of 4.445cm. Products designed to fit into 19-inch cabinets are commonly referred to as rack servers.

(8) How many forms of PDU output?

Universal jack, national standard jack, British standard jack, German standard (European) jack, IEC320 American jack, American standard jack, French standard jack, South African standard jack, information output hole, etc

(9) Cable selection of PDU cabinet socket (general calculation in theory, actual increase or decrease according to the use environment)

RVV 3*1.0mm cable rated current is 10A

RVV 3*1.5mm cable rated current is 16A

RVV 3*2.5mm cable rated current is 25A

RVV 3*4.0mm cable rated current is 32A

Cabinet socket (PDU) and ordinary power plugs compared to its advantages are mainly manifested in: more reasonable design arrangements, quality and standards are more stringent, safe and trouble-free long working hours, various types of leakage, overload protection is more excellent, plugging and unplugging action is not easy to damage the frequent heat rise temperature is small, the installation of a more flexible and convenient, suitable for the power requirements of the industry is very stringent customer use. Also fundamentally eliminate the common power plug due to poor contact, small load caused by frequent power outages, burning, fire and other security risks.

At present, there are nearly a hundred domestic manufacturers of ordinary sockets, regardless of which one, usually ordinary socket wire than 0.75, 1.25, 1.0 and other specifications, these three specifications of the cable configuration of the socket, the majority of manufacturers will be labeled rated 10A; there are also 1.5mm2 cable, in accordance with the cable standard RVV 3 * 1.5mm cable rated current-carrying capacity is 16A.

No matter which configuration, the rated carrying power of ordinary sockets is difficult to really reach more than 4000W. Obviously difficult to meet the demand for 16A, 20A, 30A, 60A, etc. in the cabinet at every turn, if the use of ordinary non-professional sockets for a long time tired work, easy to get into trouble.