American Fibertek PSR-1S - Manual (Page 6)

The ON/OFF switch is located on the rear of the unit. Be sure the switch is in the off (O)
position before connecting to the power source. Please note that this supply is intended
to be used with, and only when inserted into, an SR-20 or SR-20R sub-rack frame. Even
though the output connector is recessed, there is potential for high current at the output.
The sub-rack SR-20 is supplied with a three-conductor power cord. The Ground
conductor is directly connected to the chassis. See safety instructions.
REDUNDANT OPERATION
A Master supply will not function without a Slave supply present. The Master and Slave
supplies may be inserted into either of the two power supply slots provided by the SR-
20R (See INSTALLATION section). Due to the space required for the second PSR, the
SR-20R will only accommodate eleven plug-in applications cards.
To turn the system "ON" it is necessary to turn the master supply on first. The slave
supply is then powered and will monitor the master supply output.
Linear voltage sensing in the slave supply monitors both polarities of the master output.
In the event of master supply failure, the slave supply will take over, disconnecting the
master supply from the distribution bus in the rear of the sub rack frame.
When the slave supply takes over its LED indicators will illuminate. The LED indicators
on the master supply may or may not have its LEDs on.
Upon replacing a failed master or to reset the system the following steps are to be taken:
1. Be sure both master and slave are properly inserted into
the sub rack frame.
2. Apply power to the master supply.
3. Turn slave "OFF" for 5 (five) seconds.
4. Apply power to the slave supply. (The LEDs should not
illuminate.)
SERVICE INFORMATION
In the event of required service to this unit; please direct all inquiries to:
American Fibertek, Inc.
Phone: (732) 302-0660
120 Belmont Drive FAX (732) 302-0667
Somerset, NJ 08873 E-mail: [email protected]
GRAPHICAL SYMBOLS
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