ATI Audio SYS10K - Manual (Page 4)

59803-1, and a precision ratchet type self-indexing hand tool AMP59801-1. Consult:
factory for more information.
The SYS10K uses only three wire grounded power plugs. The third wire ground can
cause a ground loop with your station ground. If you are sure your station 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 station 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. A recommended Alarm interface circuit capable of
operating audible and visual alarms is shown in figure 1. Several racks of distribution
amplifiers may be paralleled into a single alarm interface.
MODIFICATIONS
230 VAC OPERATION
PS100 incorporate dual transformer primaries, which 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.