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Old October 7th, 2017, 02:40 PM   #1
DoubleJ
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440C-CR30 help

I need some guidance. I'm in the process of installing a CR30 with two 24v AB safety contactors. My safety program includes an E-Stop to an immediate off and 3 interlock switches to an immediate off. Two feedbacks and a reset function. My program for the CR30 works as intended except for the outputs. I have terminal 18 and 19 (set as PT) going to each contactor individually. When I power up the system the contactors do not engage and the CR30 I guess growls a little the faults out. If I unwire the contactors the safety relay works as intended and shows 24v on the outputs. I have an identical application on another machine and it works fine. I am lost on what to do. I tried using smaller AB safety relays and they work fine. I upped my power supply from a 2 amp to a 6 amp and tried that also.
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Old October 7th, 2017, 05:26 PM   #2
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I used the relays and ran 24v through them to the contactors and the contactor pulled in but gets really hot after a few minutes. Any ideas?
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Old October 7th, 2017, 06:13 PM   #3
jstolaruk
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Sounds faulty (coils). What is the holding current? Part numbers?
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Old October 8th, 2017, 08:27 AM   #4
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700-cf310ej low consumption 24v coil
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Old October 8th, 2017, 09:25 AM   #5
bill4807
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What's the resistance on the 700-cf coil? Last time I measured a 700-cf620 it was roughly 65 ohms. I believe the CR30 output can handle 0.5A but I always run it through a 700HPS to power my larger contactors anyways.
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Old October 8th, 2017, 12:07 PM   #6
DoubleJ
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Not sure will have to check tomorrow. I did however try to use a 700HPS between the contactor and the CR30. Using the #18 output on the CR30. The CR30 would energize the relay. The 700-cf contactor pulled in and got extremely warm within a short period.
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Old October 8th, 2017, 03:25 PM   #7
jstolaruk
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Swap the suspect contactor out with a known good one. Sounds like you've narrowed it down already.
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Old October 8th, 2017, 05:43 PM   #8
DoubleJ
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I've just never seen a brand new contactor be bad out of the box.
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Old October 8th, 2017, 10:07 PM   #9
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It does happen, had one from Siemens about a month ago.
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