![]() ![]() ![]() Teacher Favorites Social Studies & Character Education.Teacher Favorites English Language Arts.Family Engagement English Language Arts.Family Engagement Educational Games & Puzzles.Eco-Friendly Cleaning & Facility Supplies.Note:Construct the circuit so that operating lock release switch Sr requires an AND condition for the perfect rotation stop signal. (K3)Ģ.Safety door: Monitors whether the safety doors are open or closed via safety switches SW1 and SW3, and whether they are locked via safety switch SW2. (K3) The magnetic contactor will maintain a gap in normally closed contacts of at least 0.5 mm even if normally open contacts are welded shut.ġ.Contact welding: Detects whether the contacts of interface relays K1 and K2 as well as magnet contactors KM1 and KM2 are welded shut, and turns OFF the coil power supply for magnet contactors KM1 and KM2 if welding has occurred. This automatically checks all relay contacts for faults via the safety circuit interface relay and it prevents the start of operation if any faults are found. ![]() Generates an electrical potential between each channel with a two-channel input. Reduces common faults by combining safety switch SW1 in positive operation with safety switch SW3 in negative operation. (1, 2, and 3: Refer to safety category 1.)Ĥ.Fail-safe design keeps the safety door locked when power fails.ĥ.Foolproof design prevents incorrect operation.ġ.Input redundancy using switches: Two-channel input with limit switches SW1 and SW3 in positive operation.Ģ.Circuit redundancy using relays: Improves reliability with duplicate relay coil operating circuits K1 and K2.Ĥ.Feedback circuit: Improves reliability by feeding back the series-connected normally closed contacts of interface relay unit output circuits KM1 and KM2 to the interface relay unit. Reduces common faults by combining safety switch SW1 in positive operation with safety switch SW2 in negative operation. (K3)Ģ.Safety door: Monitors whether the safety doors are open or closed via safety switch SW1 in positive operation and safety switch SW2 in negative operation. (K3)ġ.Contact welding: Detects whether the contacts of interface relays K1 and K2 are welded shut, and turns OFF the coil power supply for magnetic contactors KM1 and KM2 if welding has occurred. ![]() 1.Input redundancy using switches: Improves reliability with duplicate input using safety switch SW1 in positive operation connected in parallel with safety switch SW2 in negative operation.Ģ.Circuit redundancy using relays: Improves reliability with duplicate relay coil operating circuits K1 and K2 connected in parallel.ģ.Output redundancy using relays: Improves reliability with duplicate interface relay unit output circuits KM1 and KM2 connected in parallel. ![]()
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