Omega Engineering CYD201, Руководство оператора

Страница: 14 / 60

OMEGA Model CYD201/CYD208 User’s Manual
2-2 Installation
2.3 POWER AND GROUND REQUIREMENTS
The Model CYD201/CYD208 requires a power source of 90 to 125 or 210 to
250 VAC, 50 or 60 Hz, single phase, 3 Watts. Three-prong detachable
power cord for 120 VAC operation included. Connect to rear panel
UL/IEC/ICEE standard plug. See Table 2-1 for fuse rating.
WARNING: To prevent electrical fire or shock hazards, do not expose
this instrument to rain or excess moisture.
CAUTION: Verify proper fuse installation and AC Line Voltage Selection
Wheel on the Model CYD201/CYD208 rear panel set to available AC line
voltage before inserting power cord and turning on the instrument.
Refer to Chapter 5 to change voltage configuration.
NOTE: Do not attach the shield to earth ground at the sensor end. It may
introduce noise at the measurement end.
Table 2-1. Line Voltage and Fuse Rating Selection
Select Range Fuse
115
230 90 – 125 VAC
210 – 250 VAC
0.2 A (Slow Blow)
0.1 A (Slow Blow)
To protect operating personnel, the National Electrical Manufacturer’s
Association (NEMA) recommends, and some local codes require, grounded
instrument panels and cabinets. The 3-conductor power cable, when
plugged into an appropriate receptacle, grounds the instrument.
Grounding and shielding signal lines are major concerns when setting up
any precision instrument or system. The CYD201/CYD208 includes ground
isolation of sensor excitation to allow 4-wire measurement of diode voltage
and resistance. Improperly grounding sensor leads and shields can defeat
this feature.
Model CYD201/CYD208 digital logic ties directly to earth ground for
interface communication. The low side of the heater output connects directly
to earth ground. Shield sensor cables whenever possible. Attach the shields
to the connector shield pin.
2.4 SENSOR INSTALLATION RECOMMENDATIONS
See the OMEGA Product Catalog for sensor installation and specifications.
Call OMEGA for copies of application notes or sensor installation questions.
Below are general recommendations on sensor installation:
1. Do not ground the sensor.
2. Shield leads and connect shield wire to SHIELD on screw terminal
connector only. Do not connect shield at other end of cable.