Emerson Vilter Vission 20/20, Руководство по эксплуатации и обслуживанию

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Section 2 • Installation Recommendations
Vission 20/20 • Operation and Service Manual • Emerson • 35391SC 2.7
Best Practices
• Do:
• Keep AC wires away from circuit boards.
• Always run conduit into the bottom or sides of an enclosure.
•
Use a water-tight conduit fitting to keep water from entering the enclosure,
... IF the conduit MUST be placed in the top of an enclosure.
• The Vission 20/20 is supplied with pre-punched conduit holes. Use them!
• Don’t:
• Don’t run wires through the Vission 20/20 enclosure that are not related to the compressor control.
•
Don’t add relays, timers, transformers, etc. In the Vission 20/20 enclosure without first checking with
Vilter
TM
.
• Don’t run conduit into the top of an enclosure.
• Don’t run refrigerant tubing inside the enclosure.
• Don’t drill metal enclosures without taking proper precautions to protect circuit boards from damage.
Transformer, Fusing and UPS Sizing
The following information can be used to help determine the power requirements for a 2020 panel. This can be help-
ful for sizing transformers or UPS devices that will power the Vission 2020 panel.
• The Vission 2020 panel contains two power supplies – Total power supply load = 90 watts.
1. (1) 24VDC @ 2.2 A ( 53 watts)
2. (1) dual output 12V @1 amp + 5V @ 4A = ( 35 watts)
• The DC loads that are attached to the power supplies breakdown like this;
1. Each actuator = +24VDC @ 20mA ea (x2) = 40 mA
2. Each press transducer = +24VDC @ 30 mA ea (x4) = 120 mA
3. Each RTD (negligible) ( the hardware applies a 25 ma pulsed signal … .not constant).
For estimating purposes, assume:
A total sum constant draw for total RTDs used 50 mA
4. Each 4-20mA transmitter for an RTD = 10 mA
5. Danfoss positioning valves:
• ICAD 600 = 1.2 A
• ICAD 900 = 2.0 A
6. Howden 4-20mA LPI = 50 mA
• So for 120V fusing – consider 90 watts for the power supplies,
PLUS add any additional 120V loads that are connected to the digital o relays added to the panel.
1. Each actuator motor = 0.6 amps AC load
2. Each small solenoid = 50 watts ( estimate – read the nameplate for exact load rating)
3. Large solenoids (water, hot gas) = 100 watts (estimate– read nameplate for exact load rating )
4. Each small pilot relay = 25 watts ( estimate– read the nameplate for exact load rating)
5. Add load values for panel heaters if used, and heat trace tape if used