Part 2

480 Plug-In Assembly Configuration-CONNECTING LOADS TO TERMINAL CARD1. Turn off power to the 3497A and 3498A. If there are other assemblies inthe 3497A or 3498A, disconnect all voltage sources before touching ANYassemblies. Remove all voltage and current sources from the 3497A and 3498Ainputloutput terminals.2. If the actuator assembly is installed in the 3497A or 3498A, remove the protectivecover from the rear panel and turn the locking key counterclockwise tounlock the actuator assembly.3. Remove the actuator assembly from the 3497A or 3498A. Separate the i3ctuatorand terminal card and remove the terminal card cover by loosening the 4screws at the corners of the terminal card.4. If any load requires higher switching speeds, disconnect jumper JMP9 on theactuator card to allow higher speed switching to all channels of the actuatorassembly.5. If any load requires that the internal contact protection be removed, removethe appropriate jumper(s) for the channel(s1 involved. A jumper must be removedfor each channel involved. (i.e., if loads to be connected to channels 0 and 4 requirethat the RC network be removed, remove jumpers JMPI and JMP5 only).6. If loads require additional contact protection, connect the network across theload, as close to the load terminals as possible.7. Disconnect all voltage sources from the lead-in wires. Then, connect leadsto desired terminal card channels and connect the ground strap from the CONNECTTO EARTH terminal to the customer ground as shown in Figure 138.8. Reconnect the actuator and terminal cards and reinsert the actuator assemblyinto the 3497A or 3498A and replace the protective cover. Then connect your userinputs to lead-in wires.As discussed, the high voltage actuator assembly has an internal RC relay contactprotection network (snubber) across the relay contacts in each of the eight channels.For many loads, this snubber network provides adequate relay protection.However, for inductive loads or loads with high inrush currents (such as lamps,motors and capacitive loads), additional protection across the load may be required.These guidelines show how to determine the type of contact protection required andsome sample protection networks.Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com