Electronic overload relay 3rb2283

1 Device description

The electronic overload relay, consisting of the 3RB22/23 evaluationmodule and a 3RB29.. current measurement module,
protects electric equipment (e.g. 3-phase motors) using two different protectivemechanisms.
Feeder ground fault detection is also available as an option.

2 Installation

Snap-on mounting to 35 mm standard mounting rail acc. toEN 50 022, or to 3RB2906.. current measurementmodule.

3 Connection

The motor current is measured with the 3RB29.. current measurementmodule.
The connection of the motor lines is described in the operating manual 3ZX1012-0RB00-1AA1.
The electronic overload relay is connected on the bottom of the 3RB29... with the current measurement module using aribbon cable (3RB2987-.)
If the optional module is not present this is the BMS article number for it BMS No.538316 (Module Analog Basic 1)

• Connection
  Connection
• Check if module present with a mark for ANALOG I+/I-
  Check if module present with a mark for ANALOG I+/I-

4 Operation

• Setting current and tripping category

The setting value of the motor current Ie is adjusted using tworotary buttons.

One rotary button is used to set the maximum current IMAX and the trip class (CLASS, Fig. IVa), the other one sets the motor current between 10 and 100% of the selected maximum current IMAX (Fig. IVb).

In case of > 40% asymmetry (acc. to NEMA) and phasefailure, a tripping operation is executed acc. to Fig. X. The characteristic curves are valid for cold starting.

For starting with pre-loading, tripping times tA are reduced.

File:SIEMENS-3RB22-DM-Solid State Overload Relay CLASS.jpg

CLASS selection

Note:

The rotary switch must lock into place when setting the CLASS Ie

Using the sealable covering 3RB2984-2, you can protect the rotary buttons and the function expansion module against inadvertent operation. To do this, attach the cover.

• Thermistor protection

The unit is delivered with deactivated thermistor protection. If the unit detects a connected thermistor upon being switched on,

the thermistor is automatically activated. If the thermistor is removed,the thermistor function must be deactivated by the user, otherwisea fault signal will be output.

The user test serves to check the thermistor evaluation (activated/deactivated) status.

Deactivation: If the TEST/RESET button is pressed while the control voltage (A1/A2) is switched on, the THERMISTOR LED will light up.

Releasing the button within 3 s will deactivate the thermistorfunction.

This will be shown by the THERMISTOR LED flashing in 10 s intervals.

5 Setting

• Check the linked excel file. It shows you how to properly set the sirius relay and how to scale the WinCC ACT object.
  • Setting of Sirius 3RB2283
• Set the Reset switch to Auto.

Example:

Star/Delta (Grinder, Corona Exhaust Fan ...)

Motor nominal nameplate current: In=135 A
Resulting phase current: In/sqrt(3)=77.9 A
Range selector on Sirius >> 100A
%Imax selector on Sirius >> 77,9%
Calculated values for FactorMul: FacMul = In * 1.25 = 169 A
FactorDiv: 27648

Direct (Silo Blowing Station...)

Motor nominal nameplate current: In=150 A
Range selector on Sirius >> 1000 A
%Imax selector on Sirius >> 15%

6 Test

During testing, all protective functions remain activated.
A tripping operation/warning results in abortion of the test!
The test is started by pressing the TEST/RESET button for t > 1 s.

7 Device Status/Error codes

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8 Notes

During the startup the device may give you this error code:

All three LEDs (GND Fault, Thermistor and Overload) are flashing every five seconds.

To reset the device you have to disconnect it from the power supply.

Definition