ClimaCool UGW Manual - Manual (Page 62)

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60
Power Distribution Drawing
Notes:
1 . Breaker panel represents field power supply and is to be installed by others.
Not provided as part of the ClimaCool modular chiller system .
2 . Breaker panels can be supplied for skid mount pump/tank packages or new
construction projects as options . Consult your local ClimaCool Representative .
3 . Control wiring by others .
4 . Field connections are simplified requiring only a two-conductor shielded cable
daisy chain from the master controller to the modules. (See Figure 26).
Figure 26
Specifications for ARC156 Wiring
• Description - Single twisted pair, low capacitance, CL2P,
TC foam FEP, plenum rated cable
• Conductor - 18 AWG (7x30) stranded copper (tin plated)
0.0.0 in. (0.762mm) O.D.
• Insulation – Foamed FEP, 0.015 in. (0.381mm) wall,
0.060 in. (1.524mm) O.D.
• Twist Lay – 2 in. (50.8mm) lay on pair, 6 twists/foot (20
twists/meter) nominal
• Shielding – Aluminum/Mylar shield with 24 AWG (7x32)
TC drain
• DC Resistance – 15.2 Ohms/1000 feet (50 Ohms/km)
nominal
• Capacitance – 12.5 pF/ft (41 pF/meter) nominal
conductor to conductor
• Characteristic Impedance – 100 Ohms
Cable Shields
Do not ground the shield to earth ground or to the control
module’s power ground . The PROT485 and the individual
control modules allow the shield to float a limited amount
so that there are no ground loops . If the voltage on the
shield becomes too great relative to the earth ground, then
the excess voltage is bled off with protective devices on the
PROT485 or on the control modules .
Noise Avoidance
Avoid running communication wires or sensor input wires
next to AC power wires or the control module’s relay
output wires . These can be a source of noise that can
affect signal quality.
Common sources of noise are:
Spark ignitors
Radio transmitters
Variable speed drives
Electric motors (> 1hp)
Generators
Relays
Transformers
If noise is a problem and the wiring cannot be moved,
use ferrite clamp-on chokes on the cabling to improve
signal quality .
Induction heaters
Large contactors (ex.motor starters)
Video display devices
Lamp dimmers
Fluorescent lights
Parallel runs with power lines
Other electronic modules