48 Operation
Procedure 9 - Starting up the rectifier ( continued )
Step | Action |
23Turn ON the other rectifiers in the system.
Setting the start-up delay
24
Use this feature to reduce the inrush currents when two or more rectifiers are connected to a common ac input. Set the DIP switches on the front panel for the required
Adjusting the forced load sharing
25If the forced share mode is chosen, adjust the float voltage of each rectifier to the appropriate value plus 0.8 volts in slope share mode, as described above. For example, to have a 52.1 V float voltage :
52.1 V +0.8 V = 52.9 V.
This compensates for the internal voltage drop when the dc breaker of the rectifier is put in the ON position. Connect all the FS wires of the rectifiers together and set the two bottom DIP switches, located on the front panel, to FS for forced load sharing ( see Figure 10 ).
26If the rectifiers are connected to the NT6C43PB board, in the cabinet or frame option, the
When forced load sharing is desired, but the NT6C43PB board is not used or is bypassed, pins
The E1 terminal on the NT6C43PB board can be used when forced load sharing is desired amongst rectifiers on two, or more, cabinets or frames. In this case, the E1 terminal from all the cabinets or racks must be daisy chained with metric No. 7 ( AWG 22 ) wire.
27Repeat step 21, but in equalize mode, to verify that the current is shared equally amongst the rectifiers when a remote equalize signal is applied, or when all local FLOAT / EQL toggle switches are toggled in the EQL position. If the current reading is too low, or is 0, turn the EQL potentiometer clockwise until proper sharing is achieved. If the current is too high, or if the rectifier is in the current limit mode, turn the EQL potentiometer counterclockwise.
28Deactivate the EQL mode to return to the normal float mode.
end
UM5C05C P0745680 Standard 6.00 October 2001 | Emerson Energy Systems |
