Studio Technologies 58 1998 - Manual (Page 20)

Issue 2, April 1998 Model 58/59 User Guide
Page 20 Studio Technologies, Inc.
for Surround
Contact input 1 and contact input 2 are
+5V logic signals which are active when
they are brought to the logic low state.
While the inputs are protected from over-
current and static (ESD) discharge care
should be taken to prevent nasty signals
from reaching them. To activate contact
input 1 simply connect pin 5 to system
common, pin 4. To activate contact input 2
connect pin 6 to pin 4. The contact inputs
are active when held in the low state; they
can’t be configured to change states
(“latch”) in response to a logic pulse.
All that is required to add a remote level
control is to connect a commonly available
linear taper potentiometer. (Yes, use a
linear pot! Software in the Model 59 Con-
trol Console converts its performance to
log.) Any high-quality pot with a nominal
“coil” resistance of between 1k and 25k
ohms should work fine. Simply connect
the pot in this fashion: pin 7 to counter-
clockwise, pin 8 to wiper, and pin 9 to
clockwise. As very little current travels
through the wiring and pot, there is really
no practical maximum cable length. Be
aware that the longer the cable run, the
more chance that an accidental short
circuit could take place. This would cause
the monitor level to go to maximum.
Warning: Connecting to the remote
level control input requires very careful
attention to wiring and potentiometer
connections. Shorting pin 8 of the 9-pin
D-sub connector to common will raise
the monitor output level to maximum!
To address hearing safety issues, the
Model 59 is default configured to dis-
able the remote level control input. A
safe and reliable installation must be
completed prior to enabling the input.
AC Mains Power
The Model 58 is internally configured to
operate from either 100, 120, or 220/240V,
50/60Hz. Units shipped to North America
are factory selected for 120V operation.
Units bound for Japan are selected for
100V, while our friends “down under” and
in Europe receive units set for 220/240V.
Before connecting the Model 58 to mains
power, check that it is configured to match
the local mains voltage. Look on the back
panel (adjacent to the power entry connec-
tor) for the configured voltage(s). Note
than an incorrect configuration could
seriously damage the unit. Should it be
necessary to change the unit’s operating
voltage it must be performed only at the
factory or by an authorized service
technician.
The Model 58 uses an IEC standard
connector to mate with the AC mains
cord. The wire colors in the AC mains
cord should conform to the internationally
recognized CEE color code and must be
wired accordingly:
Connection Wire Color
Neutral (N) Light Blue
Line (L) Brown
Protective Earth (E) Green/Yellow
Safety Warning: The Model 58 does
not contain an AC mains disconnect
switch. As such, the mains cord plug
serves as the disconnection device.
Safety consideration requires that
the plug and associated outlet be
easily accessible to allow rapid discon-
nection of mains power should it prove
necessary.