Operation 37
Sequential start
The rectifier TR lead is 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 characteristics and shares the total load proportionally to its output rating.
Two
-Slope load sharing
-Forced load sharing (positive bus)
The load sharing method is normally set at the time of installation by the SLS / FS switches located on the front panel of the rectifier. The rectifier is factory set to the Slope Load Sharing Mode.
a)Slope Load Sharing (SLS)
When the SLS / FS switch is set to the SLS position, load sharing is achieved, by a
b)Forced Load Sharing (FS)
When the SLS / FS switch is set to the FS position, forced load sharing is achieved by an internal control circuit which, by slightly modifying the loop reference, achieves equal output current between rectifiers. For this to occur the rectifiers must communicate their operating current to other units on the same power plant. The CS terminals of the rectifiers in the same power shelf are connected through the back plane (for shelves equipped with a pcb backplane only). In this mode the units will share the load within +2% of their maximum output rating.
Discharge of output capacitors
The output capacitors will be completely discharged (< 2 V) two minutes after the AC power has been removed and the rectifier has been disconnected from the batteries or parallel units.
Helios Rectifier 25/48 Installation and User Manual
