HVAC/R Sensors

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Building Automation Products, Inc.,
Tel: +1-608-735-4800
Fax: +1-608-735-4804

Copyright © 2007 BAPI

VC75, VC100 & VC350
AC to DC VOLTAGE CONVERTERS

Now Snaptrack Mountable!

• Compact & Cost Effective
• 75 mA, 100 mA or 350 mA models
• Regulated Output
• Self-resetting Thermal Fuse
• Operation & Fault LED Indicators
• Ruggedized Circuitry
• Fixed or Adjustable Outputs
• Output Protected Against Overload and Accidental Short Circuit

  BAPI’s voltage converters are a cost effective way of converting 24 VAC to 5, 15 or 24 VDC for use on peripheral devices that require DC voltage. The converters are available with outputs of 75 mA, 100 mA or 350 mA. All converters are very compact and designed to fit into standard 2.75" snaptrack.
   Although most BAPI room units can run on 24 VAC power, converting to DC power eliminates the AC power “noise” which can affect the room sensor readings. BAPI’s tests show that fluctuating and inaccurate signal levels are possible when AC power wiring is present in the same cable as the signal lines. To minimize the AC voltage noise, the DC converter must be mounted as close to the controller as physically possible. Do not mount the converter at the sensor end of the wire, the AC will still couple into the sensor signal if you do. All three models are available with fixed outputs of 5 or 15 VDC, or an adjustable output of 5-24 VDC.

As a reference, the VC75 has the capability to power the following:
(1) — X-Combo Temp./Humidity Combination Room Unit
(3) — RµP Temperature Sensor Room Units
(2) — Room, Duct or Outside Air Humidity Sensors

Why does BAPI recommend using DC instead of AC power on sensors?