Wiring Inputs And Outputs; Inputs; Outputs - Carrier TruVu VAVB3-E2 Installation And Startup Manual

Wiring inputs and outputs

Inputs

The TV-VAVB3-E2 has inputs that accept the following signal types.
Signal Type
Thermistor 1
Dry contact
0–5 Vdc
0–10 Vdc
2
Pulse counter
1 To use a thermistor not listed above, you can set up a custom translation table (page 80) for your sensor in the
controller's driver.
2
The TV-VAVB3-E2 can perform pulse counting for dry contact or voltage inputs if you assign the input to a Pulse
to Analog Input microblock. See To adjust input and output properties (page 30).

Outputs

Analog outputs
Analog outputs can be used for 0-10 Vdc devices. Resistance to the ground must be 500 Ohms minimum.
NOTE The device must share the same ground as the controller.
You can configure analog outputs in the Snap application for pulse-width modulated (PWM) control of devices,
such as electrically commutated motors. When used in pulse-width mode, the output voltage is 12 Vdc and the
frequency is locked at 80 Hz. To enable, use an AO microblock and select 80 Hz PWM from the Output Type drop-
down list.
NOTE The PWM output signal is intended to directly control the speed of an ECM-type fan, eliminating the need
for an external converter board.
Binary outputs
There is one bank of relays. The bank contains 3 built-in relays with dry contacts that share a common bus input.
An external voltage source must be wired to the common Bus connection for the bank of relays.
The relay can be used to switch the voltage provided on its associated bus terminal to an external device or relay.
The relay can switch up to 3.75 A, 30 Vac/Vdc. The total power and current that can be switched by a bank of 3
relays cannot exceed the Class 2 limits of 100 VA or 4.2 A.
TruVu™ VAVB3-E2
Installation and Start-up Guide
Description
Precon Type 2 (10kOhm at 77 °F)
Input voltages should be from 0.2 Vdc to 4.0 Vdc for thermistors
The maximum current when the contact is closed is 0.5 mA. The input voltage should be 4.1
V when the contact is open. Maximum closed contact resistance is 1kOhms.
The input impedance of the TV-VAVB3-E2 is approximately 120 kOhm when configured as a
voltage input.
Pulse counting up to 10 pulses per second.
Minimum pulse width (on or off time) required for each pulse is 50 msec.
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Wiring inputs and outputs
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