36 Operation

Local ON/OFF control (AC breaker)

The AC input circuit breaker can be used to locally turn the rectifier ON/OFF. The local ON/OFF control overrides remote control signals.

Remote ON/OFF control

When a battery return (BAT RTN) signal is applied to the 'Temporary Release' (TR) input, the rectifier inhibits its operation ( no RFA will be transmitted). Upon removal of the remote ground signal the rectifier returns to normal operation.

Remote voltage sensing

Provision is made to extend the sensing leads to the battery or to the charge / discharge bus (batteryless operation) of the plant. Opening either sense lead will not adversely affect the rectifier output voltage and the rectifier will default to internal sensing mode.

Sense fail alarm (SEN FAIL)

In the event that the remote sense leads are not connected or reversed, the RC fuse on the controller fails, or the DC circuit breaker is opened. An alarm will be transmitted through the signal connector only.

Current limiting

The rectifier will limit the output current to 30 A + 0.5 A (factory setting). The current limit level can be adjusted between 12.5 A to 30 A at 54.5 V DC, or to any combination limited to 1635 W of output power within the adjustable voltage range. Extended periods of operation in the current limiting mode and repeated transitions between constant-voltage operation and constant-current operation will have no detrimental effect on the rectifier’s performance, or service life.

The rectifier is capable of starting when connected across a completely discharged battery without requiring human intervention or operation of protection devices. Transitions from constant-voltage operation to constant- current operation and constant-current operation to constant-voltage operation will occur automatically as determined by the output current. The current limit circuit will remain working in both the float and equalize modes.

Soft start / walk-in

The rectifier incorporates a walk-in circuit that limits the output current rise to about 3 A +/- 0.5A every second.

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.

UM5C06D ( 169-2071-504 ) P0831010 Standard 7.00 May 2001

Page 36
Image 36
Emerson NT5C06D Local ON/OFF control AC breaker, Remote ON/OFF control, Remote voltage sensing, Sense fail alarm SEN Fail