3-14 F60 Feeder Protection System GE Multilin3.2 WIRING 3 HARDWARE33.2.6 CONTACT INPUTS AND OUTPUTSEvery contact input/output module has 24 terminal connections. They are arranged as three terminals per row, with eightrows in total. A given row of three terminals can be used for the outputs of one relay. For example, for form-C relay outputs,the terminals connect to the normally open (NO), normally closed (NC), and common contacts of the relay. For a form-Aoutput, there are options of using current or voltage detection for feature supervision, depending on the module ordered.The terminal configuration for contact inputs is different for the two applications.The contact inputs are grouped with a common return. The input/output modules have two versions of grouping: four inputsper common return and two inputs per common return. When a contact input/output module is ordered, four inputs per com-mon is used. If the inputs must be isolated per row, then two inputs per common return should be selected (4D module).The tables and diagrams on the following pages illustrate the module types (6A, etc.) and contact arrangements that can beordered for the relay. Since an entire row is used for a single contact output, the name is assigned using the module slotposition and row number. However, since there are two contact inputs per row, these names are assigned by module slotposition, row number, and column position.Some form-A / solid-state relay outputs include circuits to monitor the DC voltage across the output contact when it is open,and the DC current through the output contact when it is closed. Each of the monitors contains a level detector whose out-put is set to logic “On” when the current in the circuit is above the threshold setting. The voltage monitor is set to “On” whenthere is a voltage across open contact (the detector allows a current of about 1 to 2.5 mA), and the current monitor is set to“On” when the current flowing through the closed contact exceeds about 80 to 100 mA. The voltage monitor is intended tocheck the health of the overall trip circuit, and the current monitor can be used to seal-in the output contact until an externalcontact has interrupted current flow. If enabled, the current monitoring can be used as a seal-in signal to ensure that theform-A contact does not attempt to break the energized inductive coil circuit and weld the output contacts.Block diagrams are shown as follows for form-A and solid-state relay outputs with optional voltage monitor, optional currentmonitor, and with no monitoring. The actual values shown for contact output 1 are the same for all contact outputs. Form-Acontact output with or without a current or voltage monitoring option is not polarity sensitive. The polarity shown in the figureis required for solid-state contact output connection.Figure 3–16: FORM-A AND SOLID-STATE CONTACT OUTPUTS WITH VOLTAGE AND CURRENT MONITORINGLoadI~#a~#b~#cV827862A4.CDR+++++a) Voltage with optionalcurrent monitoring Voltage monitoring onlyLoadIVBoth voltage and current monitoringLoadIVb) Current with optionalvoltage monitoring Current monitoring only Both voltage and current monitoring(external jumper a-b is required)LoadVLoadc) No monitoring~#a~#b~#c~#a~#b~#c~#a~#b~#c~#a~#b~#cI
