goshenelectric

The Emerson rectifiers comprise two parts: 3-phase 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 ER22010/T

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.

Others refer to www.emerson-cn.com

 

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. See the following table for details.

 

 

 

Type	Parameter		ER22010/T		ER11020/T
Input	Input voltage		323V ~ 475V (3ph 3 wire system)
	Input current		≤ 10A		≤ 10A
	AC input frequency		45Hz ~ 65Hz
	Efficiency		≥92%		≥92%
	Power factor		0.94
Output	Output voltage range		176V ~ 320V		88 ~ 160V
	Rated output current		10A		20A
	Max. output current		11A		22A
	Soft start time		3 ~ 8s
	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
	Phase failure protection		Limited power output 5A/260V		Limited power output 10A/130V
	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
EMC	Immunity To Electrostatic Discharge		GB/T 17626.2-1998 Table 2 Level 3
	Immunity To Oscillatory Waves		GB/T 17626.12-1998 Table 2 Level 3
	Immunity To Conducted Interference		EN 55022 Class A
	Immunity To Electrical Fast Transient/Bursts		GB/T17626.4-1998 Level 3
	Immunity To Surges		GB/T17626.5-1998 Level 3
	Immunity To Conducted Disturbances, Induced By Radio-Frequency Field		GB/T17626.5-1998 Level 3
	Immunity To Power Frequency Magnetic Fields		GB/T17626.8-1998 Level 4
	Immunity To Damped Oscillatory Magnetic Field		GB/T17626.10-1998 Level 4
	Immunity to Radiated, RF Electromagnetic Field		GB/T17626.3-1998 Level 3
	Immunity to Voltage Dips, Short Interruptions and Voltage Variations		IEC61000-4-11 95% 0.5 Period       >30% 25 Period      >90% 250 Period
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)		315×88×176		315×88×176
	Weight		6kg		6kg
Cooling method			Forced cooling, with dust proof design

Others refer to www.goshenelectric.com.cn or www.emerson-cn.com