Emerson MPR15 Series, MPR25 AC inrush current, Sequential start, Parallel operation, Load sharing

26 Operation

AC inrush current

The AC current during the turn on sequence of the rectifier, under all input and output conditions specified in this document, will not exceed its full load steady-state value.

Sequential start

The rectifier Temporary Release (TR) leads are available for use with an external sequential start circuit.

Parallel operation

The rectifier is capable of operating in parallel with other rectifiers having similar output slope characteristics.

Discharge of output capacitors

The output capacitors will automatically discharge when the rectifier is disconnected and the AC power has been removed.

Load sharing

Rectifiers connected in parallel and sensing at the same point will share the load with other rectifiers having similar negative output slope characteristics (300 mV drop from zero to full load).

The rectifier will share the load proportionally to its output rating to a precision within +10%.

Monitoring features

Input AC voltage monitor

The rectifier monitors the input voltage and inhibits its operation when the voltage exceeds the specified limits. Refer to the “Summary of Specifications” section, sub section Electric. An RFA is initiated.

The rectifier recovers its normal operation automatically when the specified input voltage is re-established.

Thermal shutdown

The rectifier protects itself against thermal overstress by inhibiting its operation for the duration of the high temperature condition. The RFA alarm is triggered. The rectifier will restart after the temperature has returned to a safe level.

UM5C06B / C ( 169-2071-500 ) P0711722 Standard 10.00 May 2001