Recent content by brinkmann27

Thanks Keith

We have the ML1400, 1762-IF4 and 1762-OF4 modules. The system consists of one pump supplying 2 water systems. Each system has a flowmeter and a modulating valve. The flow is to be split 50/50 thru each system. There are 3 different flow rates needed. The PID's are set up to take half the...

We have the ML1400, 1762-IF4 and 1762-OF4 modules. The system consists of one pump supplying 2 water systems. Each system has a flowmeter and a modulating valve. The flow is to be split 50/50 thru each system. The PID's are set up to take half the desired flow and adjust the modulating valve to...

The comments as to our logic is not an intent "get around anything." We were trying to see how others in the control panel industry defined their control panels. Until you do this it's hard to know which standards must be met. As per UL NITW guide info there is a "General Use Industrial...

For a few customers we build control panels which are for groundwater remediation systems. They usually have an UL489 breaker or a disconnect, breakers for other equipment and control logic. We use a thru door disconnect for the main breaker. Seeing this was too easy, a customer wanted a cable...

We make a small PCB which controls a pump. We have an alarm/shutdown circuit which is delayed by one minute during startup. In the past we have used a solid state timer off the board and wire back to it. The coil voltage is 24 VAC and we have a SPST contact on the timer. Ideally we would like...

Customer has a DPST , Normally open relay (30 amp). They want this to turn a pump on and off. (Act as a contactor) The coil voltage is 24 VAC which is controled by a separate source. The pump motor could be 115 or 220 volts. At 220 volts no problem, switch both legs to start/stop the pump. At...

Thanks Keith, I think we'll use that switch and fuse one side of the transformer secondary.

We are designing a small PCB with a dual voltage transformer. Customer would have a choice of input power. It's rated for 115/1/60 or 220/1/60. Primary connections have 4 pins. For the customer connections we will use pin 1 (L1) and pin 4 (L2). If we connect pin 1 and pin 3 ( for L1) and connect...

Thanks nelboy, just tried that. Same results, unit will connect for 1000-2000 packets then the errors come. Then lost connection.

no other devices hooked up & we're on AC power. The USB power management is turned off

Thanks jde, Just tried that, it stays online a little longer but still drops off.

We have: A) 1762-L24AWA Micrologix 1200 PLC B) 1761-CBL-PM02 Ser. C Cable (Serial to PLC) C) AB 9300-USBS Adapter (USB to Serial) with Prolific Software/Driver D) RS LInx Classic Rev. 2.50.00.20 E) RSLogix 500 Rev. 7.00.00 (CPR 7) F) HP Pavillion 8330 Computer (only has USB Ports)...

We have had the same problem and received a demo cd from ecti.com . It's called the PLC Schematic generator. Works with Autocad. Looks nice, but I'm not sure of the cost.

Thanks for all the replies.....if the customer is correct and the line to neutral voltage is 240 volts, not 277 what is the proper way to add circuit breakers? This is a 3 phase system. The 480 volt ones are no problem, a standard 3 pole 600 volt breaker. But if we use a line to neutral...