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The output voltage of the paralleled modules or the common DC bus (before the
Schottky Diodes D1) can be adjusted between 26.8 V and 28.5 V by adjusting the
voltage of each module individually as per the following procedure ( This procedure is
explained for SEC-2450BRM which has 5 modules ). The voltage at the output
terminals LOAD + and LOAD – will be as follows :
At no load
At 10 A load
At loads > 10 A
Procedure
•
Switch off the unit and unplug the power cord.
•
The output voltage of each individual module is adjusted one by one starting
from the left most module – Module 1 and progressing to the right most module
– Module No. 5 ( for SEC-2450BRM ). AC input is connected only to the mod-
ule being adjusted. AC input to the remaining modules is disconnected
•
Remove the AC input connections ( female quick connect terminals connected to
the L and N male tab terminals on the modules – Fig. 1 ) from Module Nos. 2, 3,
4 and 5. Temporarily insulate these female quick connect terminals with insulat-
ing tape for safety. Now, only Module No. 1 can be energized.
•
Switch on the power supply. Only Module No. 1 will operate. Adjust the output
voltage of this module to the desired value with the help of potentiometer VR1
(Fig.1) Measure the voltage at the screw terminals S5 and S6 (Fig.1)
•
Switch off the power supply. Remove the AC input connection from Module No.
1. Temporarily insulate these terminals with insulation tape. Remove temporary
insulation from the AC connectors for Module 2 and connect them to Module 2.
Now only Module 2 can energize.
•
Switch on the power supply. Only Module No. 2 will operate. Adjust the output
voltage of this module to the desired value with the help of potentiometer VR1
(Fig.1). Measure the voltage at the screw terminals S5 and S6 (Fig.1)
•
Continue to adjust the voltage of the remaining Module Nos. 3, 4 and 5 individu-
ally as explained above making sure that the AC power is connected to only
the module being adjusted.
•
After all the modules have been adjusted to the same output voltage, connect
the AC input back to all the five modules.
•
Power on the unit and check that all the 5 "PSM Status" LEDs are lighted. This
will confirm that the voltage adjustment has been completed successfully
INSTALLATION AND REMOVAL OF POWER SUPPLY MODULES
NOTE: INSTALLATION AND REMOVAL OF POWER SUPPLY MODULES
SHOULD BE PERFORMED ONLY BY QUALIFIED PERSONNEL
CAUTION !
Before removing a defective module or installing a new one, switch off the 120 V , 60
Hz input power and unplug the power cord from the mains outlet.
NOTE :
Please refer to the layout diagram of the module at Figure. 1 located on page 17.
Module voltage minus 0.2V
Module voltage minus 0.4V
Module voltage minus 0.4V minus 5 mV per Amp above 10A
9.
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