LX Series Unit Ventilator Controller User's Guide 27
Outputs
The Unit Ventilator Controller has five digital outputs (DO1, DO2, DO3, DO4, and
DO5), and two analog outputs (AO1 and AO2). Descriptions of these outputs
follow.
Analog Output
The Unit Ventilator Controller analog outputs are versatile and can be configured
as analog, digital, or PWM outputs. When the analog output is configured with the
wizard as a digital output, it supplies 60 mA at 12 VDC. This ability is useful when
driving relays external to the board. See Figure 12.
The characteristics of the analog outputs are described in Table 4.
Analog Output Protection
Analog Outputs are protected by an auto-reset fuse with a maximum current
capacity defined by the following two points:
• 100 mA at 68°F (20°C)
• 0 mA at 140°F (60°C)
Digital Outputs
The digital outputs of the UVC use triacs to switch the output signal. Each digital
output is capable of conducting 1 ampere.
The digital outputs work as a switch to control the current (Figure 13). The current
source is separate from the transformers supplying the current for the UVC
controller.
Table 4: Tri-Mode Analog Output Characteristics
Mode Maximum Current and Voltage Voltage Range
Digital 60 mA at 12 VDC (200 ohm load) 0 – 12 VDC
Analog 50 mA at 10 VDC 0 – 10 VDC (linear)
PWM 50 mA at 10 VDC 0 or 10 VDC
180
DO1 C DO2 C DO3 C DO4 C DO5 C AO1 AO2–
K
Connect a diode to
the relay terminal.
(Ir = 1A at Vr=25 V)
12Vdc Relay
Max load 200 Ohm
Figure 12: Analog Output Driving an External Relay
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