ABB CMA123 PI current controller for excitation circuit

Description

Two supports should be mounted inside the cabinet in such a way, that they can carry the module’s weight. The

minimum distance between the supports should not be less than 480 mm because of electrical clearance (DC

busbars).

A L-shape support as indicated will allow to place the converter temporarily close to the front end of the support

(weight still taken by a lifting device) and then push it back to the back plate of the cabinet. The upper and lower

holes in the back plate of the converter should be used to fix the converter in that position.

The field exciters DCF803-0016, FEX-425-Int and DCF803-0035 are half controlled 3-phase

converters. All field excitiers are based on the same control board SDCS-FEX-4. The board is

equipped with its own synchronization and current control. The current measurement circuit is

automatically scaled depending on the rated field current of the motor. The field exciter is fully

controlled and monitored by the armature converter via drive-to-drive communication.

The field exciter is prepared to operate as 3-phase as well as single-phase converter.

For single-phase operation connect terminals U and W.

The control includes the following main blocks:

– Micro controller H8 for current control, synchronization and fault handling.

– 2 channel measurement of actual field current in the DC circuit.

– High ohmic measurement of AC voltage. Residual resistance to ground 1.6 MOhm

– H8 controller for drive-to-drive communication based on CAN standard.

– Driver circuit to fire the half control bridge.

– The firmware is stored in a flash memory and contains:

The PI current controller for the field circuit.

The fault and reset logic.

The synchronization and PLL function.

The setting of the current measurement channel.

All parameters are set from the armature converter via drive-to-drive communication. The field

current reference, actual field current, current control and status bits are cyclic sent via drive-to-drive

communication.

The field exciter is equipped with an autoscaling function of the burden resistors based on the

nominal field current of the motor.

Details: If you need an urgent delivery order, please feel free to contact us, and we will do our best to meet your needs.
Price issue: If you find that other suppliers offer a cheaper price for the same product, we are also willing to provide you with a reference price and give you further discounts.
Contact Us:+86 18106937731
Whatapp:+86 15359293870
Email: geabbdcs@gmail.com / 2872270648@qq.com
Contact Person: Chen

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