9492600990 7-1
DECS-150 Contact Inputs and Outputs
7 • Contact Inputs and Outputs
Eight internally-wetted, contact-sensing inputs are available for initiating DECS-150 actions. Three sets of
output contacts provide annunciation and control.
Contact Inputs
BESTCOMSPlus Navigation Path: Settings Explorer, Programmable Inputs, Contact Inputs
Eight programmable contact inputs are provided for initiating DECS-150 actions. All inputs have pre-
assigned default logic. Refer to the BESTlogic™Plus section for contact input assignments.
All contact inputs are compatible with dry relay/switch contacts. Each contact input has an interrogation
voltage and current of 12 Vdc at 1.2 mAdc. Appropriate switches/contacts should be selected for
operation with this signal level.
The length of wiring connected to each contact input terminal must not
exceed 150 feet (45.7 meters). Longer wiring lengths may allow
induced electrical noise to interfere with the recognition of contact
inputs.
The eight programmable inputs can be connected to monitor the status of excitation system contacts and
switches. Then, using BESTlogicPlus programmable logic, these inputs can be used as part of a user-
configured logic scheme to control and annunciate a variety of system conditions and contingencies.
Information about using the programmable inputs in a logic scheme is provided in the BESTlogicPlus
section.
To make the programmable contact inputs easier to identify, you can assign a custom name (up to 64
alphanumeric characters) that relates to the inputs/functions of your system. Figure 7-1 shows the
BESTCOMSPlus
®
Contact Inputs screen with the pre-assigned labels shown.
Figure 7-1. Contact Input Label Text
See the Terminals and Connectors section for an illustration of the programmable input terminals.
Contact Outputs
BESTCOMSPlus Navigation Path: Settings Explorer, Programmable Outputs, Contact Outputs
DECS-150 contact outputs consist of a dedicated watchdog output, two programmable outputs, and a
breaker shunt trip output.
Watchdog Output
This SPDT (Form C) output changes state during the following conditions:
• Operating power is lost
• Normal firmware execution ceases
• Transfer Watchdog Trip is asserted in BESTlogicPlus
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