16 | SAMLEX AMERICA INC.
SeCtION 3 |
Design & Principle of Operation
No. 5. AC input is connected only to the module being adjusted. Ac input to the
remaining modules is disconnected.
Procedure for Adjusting output Voltage of Modules (continued)
3. Prepare PSM 1 for adjustment by Removing AC input connections (female quick
connect terminals connected to the L and N male tab terminals on the module –
fig. 3.4) from PSM Nos. 2, 3, 4 and 5. Temporarily insulate these female quick con-
nect terminals with insulating tape for safety. Now, only PSM No. 1 can be
energized.
4. Switch oN the power supply. only PSM No. 1 will operate. Adjust the output
voltage of this module to the desired “set value” with the help of potentiometer
VR1 (fig.3.4). Measure output voltage of the module at the screw terminals S5
and S6 (fig. 3.4).
5. Switch off the power supply. Remove the AC input connections from PSM No. 1.
Temporarily insulate these terminals with insulation tape.
6. Prepare PSM No 2 for adjustment by removing temporary insulation from the
AC connectors for PSM 2 and connect them to PSM 2. Now only PSM 2 can be
energized.
7. Switch oN the power supply. only PSM No. 2 will operate. Adjust the output
voltage of this module to the same “set value” with the help of potentiometer
VR1 (fig. 3.4). Measure the output voltage of the module at the screw terminals
S5 and S6 (fig. 3.4)
8. Continue to adjust the voltage of the remaining Module Nos. 3, 4 and 5 individu-
ally as explained above making sure that the AC input power is connected to only
the module being adjusted.
9. After the output voltage of all the 5 modules has been adjusted to the same
“set value”, connect the AC input back to all the five modules.
10. 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.
note: As explained under Principle of operation on page 7, 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.
Summary of Contents for SEC-4825BRM
Page 34: ...34 SAMLEX AMERICA INC Notes ...
Page 35: ...Notes ...
