ClimaCool SHC onDEMAND 30, 50, 70, 85 Manual - Manual (Page 48)

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46
Power Distribution Drawing
Notes:
1.
”‡ƒ‡”’ƒ‡Ž”‡’”‡•‡–•Ƥ‡Ž†’‘™‡”•—’’Ž›ƒ†‹•–‘„‡‹•–ƒŽŽ‡†„›‘–Š‡”•Ǥ
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. ‹‡Ž† ‘‡ –‹‘•ƒ”‡•‹’Ž‹Ƥ‡†”‡“—‹”‹‰‘Ž›ƒ–™‘Ǧ ‘†— –‘”•Š‹‡Ž†‡† ƒ„Ž‡
daisy chain from the master controller to the modules. (See Figure 21).
Figure 21
’‡ ‹Ƥ ƒ–‹‘•ˆ‘”͕͙͚‹”‹‰
• 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
‘–”‘Ž‘†—Ž‡•ƒŽŽ‘™–Š‡•Š‹‡Ž†–‘ƪ‘ƒ–ƒŽ‹‹–‡†ƒ‘—–
so that there are no ground loops. If the voltage on the
shield becomes too great relative to the earth ground, then
–Š‡‡š ‡••˜‘Ž–ƒ‰‡‹•„Ž‡†‘ơ™‹–Š’”‘–‡ –‹˜‡†‡˜‹ ‡•‘–Š‡
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
™‹”‡•ǤŠ‡•‡ ƒ„‡ƒ•‘—” ‡‘ˆ‘‹•‡–Šƒ– ƒƒơ‡ –•‹‰ƒŽ
quality.
Common sources of noise are:
Spark ignitors Induction heaters
Radio transmitters Large contactors (ex.motor starters)
Variable speed drives Video display devices
Electric motors (> 1hp) Lamp dimmers
Generators
Fluorescent lights
Relays Parallel runs with power lines
Transformers Other electronic modules
If noise is a problem and you cannot move the wiring,
use ferrite clamp-on chokes on the cabling to improve
signal quality.