Chapter 4 Installing the Tracer Summit BMTX BCU
46
BAS-APG001-EN
EMI/RFI considerations
Take care to isolate HVAC controllers from electromagnetic interference
(EMI) and radio frequency interference (RFI). Such interference can be
caused by radio and TV towers, hospital diagnostic equipment, radar
equipment, electric power transmission equipment, and so on. In addi-
tion, take care to prevent the BMTX BCU from radiating EMI and/or RFI.
The BMTX BCU is equipped with EMI/RFI filters that trap RFI to
ground. In most situations, a good earth ground will reduce EMI/RFI
problems by acting as a drain for EMI and RFI. If the BMTX BCU is
receiving or radiating interference, make sure that the earth ground is
good. Do not assume that the building conduit is an adequate ground.
Checking the earth ground
Though a proper earth ground is especially important in areas of high
EMI or RFI, always check the quality of the ground, regardless of
location.
WARNING
Hazardous voltage!
The cover plate must be in place when the BCU is operating. Failure to
replace the cover plate could result in death or serious injury.
If the earth ground has a voltage of more than 4 Vac, use a different
ground. Failure to do so could result in death or serious injury.
To check the quality of the earth ground:
1.
Open the enclosure door.
2.
Inside of the enclosure at the top-right corner, remove the high-volt-
age area cover plate.
3.
Measure the ac voltage between the earth ground and the neutral ter-
minal, as shown in Figure 20 on page 47.
Ideally, the voltage should be 0 Vac. Find a different ground if the
voltage exceeds 4 Vac. A higher voltage may result in:
•
Danger to people touching the enclosure
•
Erratic communications
•
Erratic equipment operation (Because noise may affect voltage
levels at the inputs—the controller interprets input noise as
changes in temperature, humidity, pressure, and so on.)
4.
Replace the cover plate.
Summary of Contents for Engineered Smoke Control System
Page 1: ...BAS APG001 EN Applications Guide Engineered Smoke Control System for TRACER SUMMIT ...
Page 2: ......
Page 6: ......
Page 12: ...Contents vi BAS APG001 EN ...
Page 30: ...Chapter 1 Smoke control overview 18 BAS APG001 EN ...
Page 48: ...Chapter 3 Installation diagrams 36 BAS APG001 EN Figure 14 Tracer MP581 to FSCS wiring ...
Page 50: ...Chapter 3 Installation diagrams 38 BAS APG001 EN Figure 15 Tracer MP581 to FACP wiring ...
Page 57: ...Wiring high voltage ac power BAS APG001 EN 45 Figure 19 AC wiring ...
Page 59: ...EMI RFI considerations BAS APG001 EN 47 Figure 20 Checking the earth ground ...
Page 75: ...EMI RFI considerations BAS APG001 EN 63 Figure 31 Checking the earth ground ...
Page 96: ...Chapter 5 Installing the Tracer MP581 programmable controller 84 BAS APG001 EN ...
Page 110: ...Chapter 6 Installing the EX2 expansion module 98 BAS APG001 EN ...
Page 123: ...End process verification BAS APG001 EN 111 Figure 61 ast actuator fail checkb 3 13 06 ...
Page 132: ...Chapter 7 Programming 120 BAS APG001 EN ...
Page 151: ...Understanding bindings BAS APG001 EN 139 Figure 79 Mixed subnet node and group bindings ...
Page 152: ...Chapter 8 Network variable bindings 140 BAS APG001 EN ...
Page 154: ...Appendix A References 142 BAS APG001 EN ...
Page 155: ......