Qualitrol 509ITM Series, Руководство пользователя

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Dry Contact Closure Input Module
The Dry Contact (Switch) Closure Input Module is designed to detect the actuation or de-
actuation of one dry, non-powered switch contact. The system internally treats closed and
open contacts as either a 0 or 100 numeric value. Therefore, if the module is used to control
a relay, the relay set point should be set at midrange, e.g., 50.
See the Contact Closure Wiring figure for the correct circuit wiring.
Contact Closure Wiring
Powered Contact Closure Input Module
The Powered Contact (Switch) Closure Input Module is designed to detect the actuation or
de-actuation of a powered switch contact. This is accomplished by measuring a potential
across the switch contact of 0 volts when closed (a voltage measurement of <50 V AC/DC is
also considered closed) and a potential greater than 80 volts AC/DC contact is open. For
applications where a higher potential is being measured, e.g., 240 V AC, 250 VDC) there is
a jumper on the board that can be moved that will raise the sense voltage to 130 V, if
required (a voltage of <85 V AC/DC is considered closed for it). The system internally treats
closed and open contacts as either a 0 or 100 numeric value. Therefore, if the module is
used to control a relay the relay set point should be set at midrange, e.g., 50.
See the Powered Contact Wiring figure for correct circuit wiring.
Powered Contact Wiring
Input Modules
If an input module is not installed or turned off the value for the module in the protocol
communications will be -888. If the system detects a sensor failure it will report -999.