Emerson 200I/48-NT5C05C user manual Forced sharing FS

Functional description 39

Example 1 : If the rectifier is expected to provide 100 A at 48 V

V ( preset ) = 48 V + 0.8 V + ( 100 x 300 mV ) 200

V ( preset ) = 48 V + 0.8 V + 0.15 V = 48.95 V

Example 2 : If the rectifier is expected to provide 40 A at 48 V

V ( preset ) = 48 V + 0.8 V + ( 40 x 300 mV ) 200

V ( preset ) = 48 V + 0.8 V + 0.06 V = 48.86 V

Forced sharing ( FS )

When both bottom DIP switches ( SLS / FS ) are set to the FS position, forced load sharing is achieved by an internal control circuit that modifies the loop reference to equally share the output currents between rectifiers. The setting of the output voltage is not modified with changes in output load, as is the case in the slope share mode. In this mode, the rectifiers will share the load within ± 2 % of their maximum output rating.

For this to occur the rectifiers must communicate their operating current to the other rectifiers in the same power plant. The current share terminal of all the rectifiers ( P1-17 ) in the same power plant must be connected through the control cables and controller. In applications using the NT6C43PB interconnect board, such a connection is implemented automatically.

Adjust the rectifier float voltage to the desired system float voltage, plus

0.8volts, to compensate for an internal drop when the rectifier dc breaker is put in the ON position.

Example 3 : for 48 V float voltage

V ( preset ) = 48 V + 0.8 V = 48.8 V

Emerson Energy Systems Rectifier 200I/48 NT5C05C Installation and User Manual