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...
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...
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...
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)...
I know that 230/3/60 with a neutral can provide 115/1/60 (L1 with neutral). Is there or can 460/3/60 with a neutral provide 230/1/60 ? (L1 with neutral)
Thanks
Monday I'll be visiting a customer with a motor problem. Motor is 10 HP 230/3/60. Wye- delta 9 wire motor. At one time this motor was running just fine in the system.Then the motor was blowing the 60 amp fuse along with tripping the motor overload in the controller after running five minutes...
We are manufacturering a NEMA 4 control panel with an "inner door" (a door inside the enclosure) The inner door has H-O-A switches, pilot lights, hourmeters and ampmeters. Usually we make cutouts for the circuit breakers or Manual motor protectors whereas you can reset them without opening the...
We have a customer who is starting to build self contained environmental remendiation trailers for use in Florida. These trailers are similar to the ones you see the lawn maintenance guys use. Inside the trailer will be a compressor, vacuum pump and a couple of liquid pumps. Most of the time...
I have looked at previous threads on this subject and didn't find an answer to this. Or I missed it.
In a control panel we have a 3 HP 230/3/60 motor rated at 9.6 FLA. If we use NEC for Motor Circuit Conductors Sizing(Article 430-21.) For the conductor size we have FLA * 125 % or 12 amps or #...
We have a small air compressor (1/2HP) 120 volt 1 phase 60 Hz.(Capacitor start) Motor is single voltage and frequency. A customer of ours wants to use this overseas where the available power is 415 volt 50 Hz. Without derating the motor what is the best and most economical way to convert the...
A while back we built a motor control panel for a customer, which controlled six 230/3/60 VAC motors. This system ran fine for many months. Customer had the system shutdown for a couple of months. Upon restart of the system, one motor (1/2 HP Fan motor) starts up, slows down and then speeds up a...
Using a 230/3/60 V.A.C. 4 wire system with a "high" leg, is there a code in which phase this wire must be placed on (L1 or L2 or L3) ? At times a 230 volt line & neutral is used for the control voltage (115 V) or for a GFI receptacle. Of course if the high leg is on either, many...
We are building a NEMA 4 Control panel which will be certified under UL 508A & UL698A. We want to add a GFI receptacle in the enclosure, which can be used without opening the enclosure. We have found UL listed NEMA 3R covers/gaskets. We don't want to derate the enclosure to 3R. We may remote...
I have a IDEC PLC w/ an analog input (4-20 ma). This input will monitor air pressure. The PLC data register is in a decimal format (0-4095). I know 0= 4 ma and 4095 = 20 ma. I can on paper figure various conversions by adding the "ends" and dividing by two. (Mid way would be 12 ma...
