SamplexPower SEC-4825BRM, Руководство пользователя

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16 | SAMLEX AMERICA INC. SAMLEX AMERICA INC. | 17
SeCtION 3 | Design & Principle of Operation
inStALLAtion AnD ReMoVAL oF PoWeR SUPPLY MoDULeS
Please refer to figs. 3.4, 3.5 and 3.6 (pages 13 & 14).
Replacing Defective Module with new Module
Replacement Module can be ordered under Model No. “SEC-0548MPSB”.
The optional module comes with an LED and LED holder. It’s output voltage is
pre-set at 55V.
Removal and replacement procedure is given below:
1. Switch off 120 VAC, 60 Hz input power and unplug the power cord from the
main outlet.
2. Remove the top cover plate by unscrewing the 10 screws.
3. Remove the AC input power supply wires from terminals “L” and “N” of the
defective module (fig 3.4).
4. Remove connectors from terminals “LED 1 & LED 2” (fig 3.4). Terminal marked
LED2 is used for the front panel LED under “PSM Status”. Terminal marked LED1 is
used to feed 5V “PSM oN” drive signal to the associated Infrared Diode of opto-
coupler on the small opto-coupler PCB & from there it is fed to DB-25 Connector as
open Collector / open Emitter signal for remote indication.
5. Remove female connector of the Daisy Chained “SHARE BUS” wire loop connect-
ed to male terminal “JUMP1” on the module (fig 3.4, fig 3.5).
6. Each module sits on 6 stand-offs under holes S1 to S6 (fig.3.4). Remove these
screws and then remove the defective Module.
7. If this module has Temperature Sensor mounted on its heat sink, remove the Tem-
perature Sensor by removing its holding screw.
8. Place the new module on the stand-offs with the L an N terminals (fig. 3.4)
towards the front panel. Align the holes and fix the module with the 6 screws.
WARninG! Please ensure that screws S5 and S6 are very tight as the pads under
these two screws connect the output of the module to the Dc bus bar under-
neath. A loose connection under these screws will result in sparking, overheating
and consequent damage to the module.
9. As explained earlier under “Procedure for Adjusting output Voltage of Modules”
(page 15), the output voltage at the individual modules (measured at points
S5 & S6 of the module as shown at fig. 3.4) is required to be set exactly at the
same voltage for proper current share control. Each module is factory preset at a
voltage of 55V with the help of potentiometer VR1. Although the new module
SEC-0548MPSB is factory preset at 55V, it may differ slightly due to tolerance. It is,
therefore, necessary to ensure that the voltage of all the 5 individual paralleled
modules i.e. the existing modules and the new replaced module is set exactly at
55V. for this, follow instructions given under “Procedure for Adjusting output
Voltage of Modules” (page 15).