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The Emerson rectifiers comprise two parts: 3phase passive PFC and DC/DC converter circuit. Besides, there are the auxiliary power supply and the I/O detection protection circuit. The operation principle of rectifiers is shown in Figure HD22020-3

1) The 3-phase passive PFC circuit at the front-end comprises input EMI and passive PFC, which are used to rectify and filter the AC input, and to calibrate the input current, so as to ensure that the power factor of the input circuit is bigger than 0.94, meeting the related EMI and EMC standards in GB/T 17794.2.2-2003, as well as the 3-phase harmonic standard in DL/T781-2001.

2) The DC/DC converter circuit at the back end uses PWM generator to control the PFC-output DC voltage, and output DC voltage through high frequency transforming, rectification and filtering. It is used to convert the rectified voltage from the front end into the steady DC voltage output as required by the power system.

3) The auxiliary power supply is located between the input passive PFC and the DC/DC converter. It uses the DC output from the 3-phase passive PFC and powers the control circuits. 

4) The input detection circuit can detect input over/under-voltage and phase failure, while DC/DC detection circuit can detect output voltage/current and heat sink temperature. All these signals are used for the control and protection of DC/DC conversion.

1. Protection

1) Input over/under-voltage protection

The rectifiers are capable of over/under-voltage protection. When the input voltage is smaller than the set under-voltage or bigger than the over-voltage, the rectifier will be shut down for protection. There will be no DC output, and the protection indicator (yellow) will turn on. The rectifier will return to normal operation when the voltage returns normal.

2) Output over-voltage protection & under-voltage alarm

The rectifiers are capable of output over-voltage protection and under-voltage alarm. When the output voltage is higher than the preset over-voltage, the rectifier will shut down, with no output, and the alarm indicator (red) will turn on. The rectifier cannot be auto-reset. You need to power it off and on to reset it.

When the output voltage is lower than the preset under-voltage, the alarm will be raised, but the rectifier will keep its output, and the protection indicator (yellow) will turn on. This alarm will be cleared once the voltage restores to normal.

3) Short circuit foldback of output

The rectifiers are capable of limiting output upon short circuit, during which the output current will be limited to 40% of rated output current. The output will restore to normal after the short is removed.

4) Phase failure protection

The rectifiers are capable of phase failure protection. Upon input phase failures, the rectifiers will derate and output half power. The output current is 5A at the output voltage of 260V.

5) Over-temperature protection

The over-temperature protection will be triggered when the temperature is higher than the set point, either due to too high ambient temperature, or because rectifier air inlet is blocked. The Protection Indicator (yellow) on the rectifier front panel will turn on, and there will be no output. This protection can be reset automatically when abnormality is cleared and rectifier internal temperature restores to normal. 

6) Front-end over-current protection  

This protection will be triggered upon over-current at the rectifier’s rectification part. It cannot be reset automatically. To reset it, you need to power it off and on.

2. Other functions

1) Fan speed control

There are 3 classes of fan speed: stop, half-speed and full speed, determined by taking both temperature and output current into consideration.

2) Fault display

Upon rectifier faults, the alarm information will real-time flash on LED in the form of fault code. You can switch the display content to voltage by pressing the A/V button (current/voltage display switching button).

3) Communication function

The rectifier can communicate with the host through RS485 port. It can report to the host its output voltage, current, protection and alarm information, as well as receive and execute control orders from the host.

1. LED

It displays the rectifier voltage, current or alarm information. You can switch the display between output voltage and current by pressing the display switchover button (or A/V, as shown in the figure). It can display 3 digits, and the voltage display precision is ± 0.3V. As for the display precision of current, HD22010-3 is ± 0.2A, HD22020-3 and HD11020-3 is ± 0.4A, and HD11040-3 is ± 0.8A.

Upon rectifier faults, the fault code will flash on the LED.

2. Indicator

There are three indicators on the front panel, namely RUN (green), ALM (yellow) and Fault (red). Their being on indicates normal operation, protection, and fault respectively.

3. A/V

The A/V button is used to switch the display content of the LED. When the present display is output voltage, press this button once to switch it to output current, and press it again to switch it back to voltage.

4. V ADJ (voltage adjustment)

These two buttons are used to adjust the output voltage of the rectifiers in manual state. They are valid only when the rectifier is in the manual state (configurable through the first bit of the DIP switch on rectifier front panel). 

5. DIP switch

The DIP switch is used to set the control mode and rectifier’s communication address.

6. Cover plate of the handle

The rectifier handle is under the cover plate. You need to pull the cover down to show the handle. 

7. Fan cover and dust mesh

The fan cover can avoid sucking alien material into the rectifier and protect the rectifier. The dust mesh is used to filter the dust to prolong rectifier’s life span.

More information refer to www.emerson-cn.com

Type	Parameter			HD22020-3			HD11040-3
Input	Input voltage		323V ~ 475V (3ph 3 wire system)
	Input current			≤ 15A			≤ 15A
	AC input frequency		45Hz ~ 65Hz
	Efficiency		92%	≥93%	%		≥93%
	Power factor		0.94
Output	Output voltage range		176V ~ 320V		88 ~ 160V
	Rated output current			20A			40A
	Max. output current			21A	22A		42A
	Soft start time		3 ~ 8s
	Output constant current range			10% ~ 100%			10% ~ 100%
	Current stabalization (for 20% rated current or above)		≤ ± 0.5%
	Ripple		≤ 0.1%
	Voltage stabalization		≤ ± 0.5%
	Load sharing imbalance		≤ ± 5%, (typical 3%, 50% ~ 100% rated load)
Accoustic noise			<55dB
Protection	Short circuit foldback of output		Foldback current ≤ 40% rated current. Auto-reset enabled
	Output over-voltage protection		325 ± 5Vdc		165 ± 5Vdc
	Output under-voltage protection		198 ± 1Vdc		99 ± 1Vdc
	Input over-voltage	Protection point	485 ± 10Vac
		Recovery point	460 ± 15Vac
	Input under-voltage	Protection point	313 ± 10Vac
		Recovery point	335 ± 10Vac
	Over-temperature protection	Protection point	80°C
		Recovery point	60°C
	Fan speed control		Under the combined control of temperature and current
Safety	Insulation resistance		I/O to chassis and input to output >10MΩ (Test voltage: 1000Vdc)
	Dielectric strength		Impose AC between I/O and the chassis aftering shorting the input and output. Frequency: 50Hz. RMS: 2000V. No breakdown or flashover
Environment	Operation temperature		-10°C ~ 40°C
	Storage temperature		-25°C ~ 55°C
	Relative humidity		≤ 95%
	Air pressure		70 ~ 106kPa
Mechanical	Size (L × W × H) (Unit: mm)			466×139×288		466×139×288
	Weight			15kg		15kg
Cooling method			Natural cooling together with forced cooling, with dust proof design