DayTronic 3500 Series, Instruction Manual

Page: 36 / 122

2.f
P
OWERUP
Accepting a line voltage from 90 to 265 V-AC (50-400 Hz; 10 W max), your 3500
Series instrument will automatically sense the power input level and adjust its
internal regulator accordingly. THEREFORE, YOU NEED NOT SET THE INSTRU-
MENT FOR NOMINAL 110-V OR 220-V OPERATION.
IN THE EVENT OF AN APPARENT POWER-SUPPLY FAILURE, FIRST CHECK THE
0.5-AMP (250-V) BUSS FUSE LOCATED ON THE REAR PANEL (see Fig. 2). WHEN
REPLACING A "BLOWN" FUSE, ALWAYS INVESTIGATE THE CAUSE OF OVER-
LOAD BEFORE REACTIVATING THE INSTRUMENT.
To change the fuse, use a screwdriver to turn the fuse slot counterclockwise, and
the fuse holder will spring out.
The 6-foot, three-conductor power cord supplied with the unit plugs into the rear
AC POWER CONNECTOR. The offset pin on the power connector is ground.
THE INSTRUMENT MUST BE PROPERLY GROUNDED. To safely operate from
a two-contact outlet, use a 3-prong-to-2-prong adaptor and connect the green
pigtail on the adaptor to earth ground.
Since the presence of electrical noise can affect the ultimate integrity of your
data, the noise level should be suppressed as much as possible. In particular,
care should be taken to avoid utility-line problems that can interfere with or possi-
bly even damage sensitive microprocessor-based equipment. Such noise can
also be generated by electrical motors, relays, and motor control devices.
While your instrument has internal circuitry to protect it from overvoltage tran-
sients and mild EMI, a clean line is still very desirable. No protection is provided
against dropout longer than 8 milliseconds or brownout below 90 volts. Depend-
ing on your line conditions, a number of protective devices are available (isola-
tors, regulators, uninterruptible power supplies, etc.).
The ON/OFF switch is also located on the rear panel (see Fig. 2). When you
powerup the unit, you will observe the following sequence of events:
2.18
2
S
ETUP
: C
ONNECTIONS AND
P
OWERUP
2.f P
OWERUP
Logic I/O Connector
COM
+5 V
. . .
Logic Output
. . .
Coil
Resistance
> 500
Fig. 17(d) Logic
I/O Connections:
Output to
External Relay