Gai-tronics 12579-003 Monitored Relay Module (MRM) Manuale Utente Scaricare il pdf (Pagina 9)

Pub. 42004-716L2C

Model 12579-003 Monitored Relay Module Page

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Mode 3: IDC Single Normally-Closed (N.C.) Switch

In this configuration, only one normally-closed dry contact closure may be installed per supervised line.

In this mode, the loop is monitored for open circuits, wire-to-wire short circuits (across + and -), and

ground faults. When the contact closure is not active (closed), the 15 k is bypassed and the circuit sees

only the 5.1 k load.

Figure 7. IDC Single Normally-Closed Switch

This change is sensed by the MRM and indicates to the MRM that the contact closure is active. If there is

a short across L1 and L2, if either leg is grounded, or if a break occurs on either leg, the MRM indicates

that a fault has occurred.

OTE: The terminating resistors are not included with the MRM. These resistors are included in a kit

(12509-004), which must be ordered separately.

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Gai-tronics 12579-003 Monitored Relay Module (MRM) Manuale Utente Pagina 9