Section 2.2 power requirements, Section 2.3 general considerations, 1 hazardous location considerations – Spectrum Controls 1734sc-OE2CIH User Manual
Page 16: Ection, Ower, Equirements, Eneral, Onsiderations, 1 hazardous location considerations -2
2-2
Chapter 2: Installation and Wiring
User’s Manual Pub. 0300272-01 Rev. A.0
Section 2.2
Power
Requirements
The module receives power through the bus interface from the +5 VDC/+24 VDC system
power supply. The maximum current drawn by the module is shown in the table below.
5 VDC 24 VDC Field Supply
55 mA
175 mA at 12 VDC (2.1 VA max)
77 mA at 24 VDC is typical (1.85 VA)
WARNING
Output may not remain steady or may drop out if the module is set
up for maximum power draw, and the input supply voltage is down
close to its low range (around 10 volts for the supply range). When
the module is also operating at, or close to, its maximum operating
temperature of 55 degrees Centigrade, the output reductions or
dropouts may increase.
Maximum specified load on each channel is 750 ohms. Maximum
specified output current is 20 milliamperes.
For Power Supply Voltages less than 12 V limit the output load to
400 ohms if using 20 mA output current or limit the output current
to 16 mA into the maximum load of 750 ohms.
Section 2.3
General
Considerations
1734 I/O is suitable for use in an industrial environment when installed in accordance
with these instructions. Specifically, this equipment is intended for use in clean, dry
environments Pollution degree 2
1
and to circuits not exceeding Over Voltage Category
II
2
(IEC 60664-1)
3
.
2.3.1 Hazardous Location Considerations
This equipment is suitable for use in Class I, Division 2, Groups A, B, C, D or non-
hazardous locations only. The following WARNING statement applies to use in
hazardous locations.
1
Pollution Degree 2 is an environment wherenormallyonly non-conductive pollution occurs except that occasionally
a temporary conductivity caused by condensation shall be expected.
2
Over Voltage Category II is the load level section of the electrical distribution system. At this level transient
voltages are controlled and do not exceed the impulse voltage capability of the product’s insulation.
3
Pollution Degree 2 and Over Voltage Category II are International Electrotechnical Commission (IEC)
designations.