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Old August 20th, 2013, 04:25 AM   #1

annicat1 is offline
Join Date: Mar 2013
Location: Adelaide
Posts: 6
Timers and counters

Good evening. I need your advise in regards to some tasks that I have with ladder logic & mnemonic code. The tasks are:
1)ladder logic to energize the output 1 one minute and 5 sec after input 1 is closed. answer: LOD 1, TIM 1 (set for 1 min 5 sec=650),LOD TIM 1, OUT 1
2) design a ladder diagram for start/delta motor starter using a 3.5 second delay from start to delta. star and delta contactors must not be energized at the same time. izumi controller addresses: start button 1, stop button 2, overload 3, main contactor 200, star contactor 201, delta contactor 202. answer: need to use timer as well and NC contacts in order to prevent star and delta contactors energized at the same time.But need help with the logic.
3)A large 3 phase motor has a restricted duty cycle and must not be started more that 5 times in 1 minute. Develop the logic to accomplish this starting motor DOL. should the motor be started 5 times within 1 minute, then it must not be able to started again until a further 2 minutes have elapsed. answer: need set counter to 5 and have delay timer for 2 minutes. But need help with the logic.
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