ATI Audio BP100-2 - Manual (Page 5)

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The System 10K uses only three-wire grounded power plugs. The third wire
ground can cause a ground loop with your facility ground. If you are sure your
facility ground will provide adequate protection to personnel in case of an AC line
short to chassis, a 3-to-2 AC adaptor can be used to isolate the power line
ground. We recommend that the adaptor be removed and the power line ground
reconnected prior to any service work requiring removal of the facility ground
from the chassis.
To allow maximum flexibility in grounding in high RF environments, the circuit
grounds are isolated from case ground. An individual circuit ground is available
next to the HI input terminal of each module. These grounds are already
interconnected through the common DC power supplies. It is not recommended
that the individual circuit grounds be tied together since a ground loop would
result. A common DC ground is available on the ALARM terminal block pin 3.
This ground may be interconnected, tied to chassis or connected to a studio
ground system.
ALARMS
Alarm lines from the two power supplies are paralleled and brought to a barrier
block mounted on the left hand rear sidewall. The power alarm is connected to
pins 1 and 2. The power alarm outputs are reed relay contacts which close if
either or both DC output voltages drop below 11 volts due to excessive loading,
blown fuses or loss of AC power. The reed relay contacts should not be used to
switch high current lamp loads or AC line voltages. Several racks of distribution
amplifiers may be paralleled into a single alarm interface.
MODIFICATIONS
230 VAC OPERATION
The PS100 Power Supply incorporates dual
transformer primaries that can be strapped for 115 or
230 VAC operations. To use on 230 VAC power,
remove jumpers J1 and J3 from the solder side of the
PSI00 PC Board and insert a jumper in the J2
position.
DUAL AC POWER
Each PS100 of a redundant powered system may be
operated from a separately fused AC system for even
greater reliability. An additional AC line cord is
required and replaces the AC jumpers between the
power blocks of the two PS100 modules.