ETDOC: Digital Output Control Boards


Features

  • Two optically isolated relay outputs
  • Manual Output Override with position monitoring (ETDOC‑U)
  • Compact Size, Easy Wiring
  • LED indication for output and power supply status
  • Low cost, ideal for Energy Management Applications
  • Two optically isolated relay outputs
  • Manual Output Override with position monitoring (ETDOC‑U)
  • Compact Size, Easy Wiring
  • LED indication for output and power supply status
  • Low cost, ideal for Energy Management Applications

Application

The ETDOC provides two 5A rated relays that can be driven by a low voltage, low current control device. Two 5A rated toggle switches provide H‑O‑A function for each output. The ETDOC‑U model features additional outputs to allow for the monitoring of H-O-A override switch positions. The ETDOC boards are ideal for interfacing remote HVAC equipment that may require local manual override (i.e roof top units, pumps , small fans etc.).


Product Description

The ETDOC-2 is a two channel board that contains two independent SPDT (Form C) relays activated by any 10VDC, low current control device (i.e. standard DDC Digital Output points). The ETDOC‑2 includes two 5A rated manual override switches that provide the H-O-A function. The ETDOC-2 inputs are optically isolated and, if powered by a dedicated 24 VAC transformer, this board may help eliminate ground loop problems.

The ETDOC-U is similar to the ETDOC‑2 but it accepts any input voltage signal ranging from 8 V to 24 V, both DC or AC. This model offers two SPST (N.O.) outputs. It also features a provision for remote monitoring of the H-O-A switches. The auxiliary contact of each switch is used to provide its status information. The contact is closed in 'Auto' position and terminated at a separate connector. The on-board jumper allows for separate or joined (AND function) monitoring of both switches position.

The boards are equipped with angular connectors for fast and easy wiring. They mount in a plastic molded snap-track (provided).


Specifications

 ETDOC-2ETDOC-U
Power24 VAC, less than 2 VA
Input10 VDC, maximum 15mA8 to 24 VDC or VAC, 8mA @10VDC
Outputtwo independent relays; 5A @ 125 V
SPDT contacts
two independent relays; 5A @ 125 V
SPST-NO contacts
Isolation1500 V minimum (input-output).
Isolated power supply (ie: control transfomer) must used for full isolation.
IndicationOutput relay status (yellow LED)
Power ON (green LED);
HAND or OFF override mode - closed dry contact
DimensionsW=2.75", L=3.2", boards mounts in TR-2 snap-track (provided).

Ordering Information

ETDOC-2 : 10VDC input, SPDT (form C) contacts

ETDOC-U : 8-24VDC/VAC input, SPST-NO contacts, status indication


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