Product Location and Requirements Chapter Two: Installation
12
5. In selecting the appropriate type and wire size for cables, consider:
A. The voltage ratings;
B. The cumulative I
2
R heating of all the conductors (keep them safely cool);
C. The IR drop of the conductors, so that adequate power or signal voltage gets to the
device;
D. The capacitance and inductance of cables which are handling fast signals, (such as data
lines or stepper motor drive cables); and
E. That some cables may need internal shielding from specific wires to others; please see the
instruction manual for details regarding this matter.
Product Location and Requirements
• Ventilation requirements include sufficient air circulation
• Maintain the normal operating temperature between 0° and 50° C
• Maximum differential pressure is 150 psia [1034 kPa], consistent with the overpressure
limit of the pressure transducer
Refer to Applications with a Large Differential Pressure, page 31, for more information.
• Pressure transducer overpressure limit: 45 psia [310 kPa] or 2 times full scale, whichever
is greater
• Provide power input at ±15 VDC (±5%) @ 250 mA
1. Maximum voltage/current at startup is ±15 VDC (±5%) @ 250 mA
2. Typical steady state voltage/current should be ±15 VDC (±5%) @ 200 mA
• Warm up time: 5 minutes
• Use high purity gas and filters in line upstream of the controller
• Mount the 649 controller in an upright position if possible, although any mounting
orientation is satisfactory
Refer to Installing the Unit, page 17, for more information.
• Install a separate positive shutoff valve if your system cannot tolerate some leakage
across the control valve in the 649 controller
The control valve is not a positive shutoff valve so some leakage across the valve may
occur.
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