GE C60 Instruction Manual

Also see for C60: Communications manual Communications guide Instruction manual Instruction manual Instruction manual

Contents

3-10 C60 Breaker Management Relay GE Multilin3.2 WIRING 3 HARDWARE33.2.5 CONTACT INPUTS/OUTPUTSEvery digital input/output module has 24 terminal connections. They are arranged as 3 terminals per row, with 8 rows intotal. A given row of three terminals may be used for the outputs of one relay. For example, for Form-C relay outputs, theterminals connect to the normally open (NO), normally closed (NC), and common contacts of the relay. For a Form-A out-put, there are options of using current or voltage detection for feature supervision, depending on the module ordered. Theterminal configuration for contact inputs is different for the two applications. When a digital I/O module is ordered with con-tact inputs, they are arranged in groups of four and use two rows of three terminals. Ideally, each input would be totally iso-lated from any other input. However, this would require that every input have two dedicated terminals and limit the availablenumber of contacts based on the available number of terminals. So, although each input is individually optically isolated,each group of four inputs uses a single common as a reasonable compromise. This allows each group of four outputs to besupplied by wet contacts from different voltage sources (if required) or a mix of wet and dry contacts.The tables and diagrams on the following pages illustrate the module types (6A, etc.) and contact arrangements that maybe ordered 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.UR RELAY FORM-A OUTPUT CONTACTSSome Form-A outputs include circuits to monitor the DC voltage across the output contact when it is open, and the DC cur-rent through the output contact when it is closed. Each of the monitors contains a level detector whose output is set to logicìOn = 1î when the current in the circuit is above the threshold setting. The voltage monitor is set to ìOn = 1î when the cur-rent is above about 1 to 2.5 mA, and the current monitor is set to ìOn = 1î when the current exceeds about 80 to 100 mA.The voltage monitor is intended to check the health of the overall trip circuit, and the current monitor can be used to seal-inthe output contact until an external contact has interrupted current flow. The block diagrams of the circuits are below abovefor the Form-A outputs with:a) optional voltage monitorb) optional current monitorc) with no monitoringFigure 3ñ13: FORM-A CONTACT FUNCTIONSLoadI~#a+-~#b~#cIf Idc 1mA, Cont Op x Vonotherwise Cont Op x VoffV~827821A4.CDRa) Voltage with optionalcurrent monitoring Voltage monitoring onlyLoadI+-VBoth voltage and current monitoringIf Idc 80mA, Cont Op x Ionotherwise Cont Op x Ioff~If Idc 1mA, Cont Op x Vonotherwise Cont Op x Voff~LoadI+-Vb) Current with optionalvoltage monitoring Current monitoring only Both voltage and current monitoring(external jumper a-b is required)If Idc 80mA, Cont Op x Ionotherwise Cont Op x Ioff~LoadI-V+If Idc 80mA, Cont Op x Ionotherwise Cont Op x Ioff~If Idc 1mA, Cont Op x Vonotherwise Cont Op x Voff~Load+-c) No monitoring~#a~#b~#c~#a~#b~#c~#a~#b~#c~#a~#b~#cwww . ElectricalPartManuals . com