Trigger Inputs
The EZ-3u provides four options for triggering its operational cycle:
•
Dry contact (button, mat switch, etc.) terminal (E)
•
12 to 24 VDC input from another controller (F)
•
PIR (G)
– 3-pin header provides power and signal connections for Parallax-compatible PIR sensor
•
START button (H)
All inputs are active and may be used together if desired.
Relay Outputs
The EZ-3u provides normally-open and normally-closed relay outputs for the period of the run cycle. These
terminals are capable of switching AC or DC up to 5A.
Pulse Outputs
Unique to the EZ-3u are the pulse outputs that are active at the beginning of the run cycle.
•
High-current, open-collector DC output (L) for valves and relays
•
Low-current, open-collector or 5 VDC output (M) for audio players
– output set with configuration jumper (N)
The high-current output terminal is designed for use with valves, relays, LEDs, and other DC devices. The
positive side of the device is connected to the V+ terminal, the negative side of the device is connected to the
PULSE terminal.
The low-current AUDIO output header may be configured for Open-Collector (OC) or 5 VDC output. The 3-pin
audio header provides ground (B pin), 5 VDC (R pin), and selected pulse signal (W pin).
EZ-3micro Operation
As with traditional 3-stage timers, the EZ-3u waits for a trigger signal. When a trigger input is detected, the
PRE delay timing is started; during this period the PRE delay LED (yellow) will light. When the pre-delay
timing is complete the RUN timing is started; during this period the RUN time LED (green) is lit and the on-
board relay is active. When the run timing is complete the relay is deactivated and the OFF timing is started;
during this period the OFF time LED (red) is lit and the EZ-3u will ignore its trigger inputs. At the completion of
the off-timing period, the red LED will extinguish and the EZ-3u is ready for another trigger input.
What makes the EZ-3u unique is the addition of pulse output signals that occur at the beginning of the run
cycle. These outputs can be used to run a short-duration DC output (PULSE terminal) or to start an external
audio player (AUDIO terminal).
The illustration on the following page visually describes the sequential operation of the EZ-3u on detecting a
trigger input.
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