9.
The output voltage of the paralleled modules or the common DC bus (before the Schottky Di-
odes
D1
) can be adjusted between 13.8 V and 14.6 V by adjusting the voltage of each module
individually as per the following procedure ( This procedure is explained for SEC-100BRM
which has 5 modules ).
The voltage at the output terminals LOAD + and LOAD – will be as
follows :
At no external load
Module voltage minus 0.2V
At 10A load
Module voltage minus 0.4V
At loads > 10A
Module voltage minus 0.4V minus 5mV per Amp above 10A
Procedure
•
Switch off the unit and unplug the power cord.
•
The output voltage of each individual power supply module (
PSM
) is adjusted one by one
starting from the left most module – PSM 1 and progressing to the right most module –
PSM No. 5 ( for SEC-100BRM-220 ).
AC input is connected only to the module 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 PSM Nos. 2, 3, 4 and 5. Temporarily
insulate these female quick connect terminals with insulating tape for safety.
Now, only
PSM No. 1 can be energized.
•
Switch on the power supply.
Only PSM 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 PSM No. 1. Temporar-
ily insulate these terminals with insulation tape. Remove temporary insulation from the AC
connectors for PSM 2 and connect them to PSM 2.
Now only PSM 2 can energize.
•
Switch on the power supply.
Only PSM 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 individually 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 con-
firm that the voltage adjustment has been completed successfully.
NOTE: As explained under Design & Principle of Operation on page 3, it is likely that the
minimum internal preload current for the new value of the output voltage may not be
sufficient to provide adequate feedback signal strength resulting in shut down of one or
more PSM(s) when no external load is present (The associated PSM Status LED will flash
and also, the associated signal for remote indication will oscillate between High and
Low). In such a case, apply an external load to increase the feed back signal strength. If
there is no other defect, the PSM(s) that were shut down will also operate normally.
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 230 V , 50/60 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
.
