Designing a BMS (Building Management System) with UI (User Interface)
I never done a design of a BMS (Building management system) and would like some guidance. I've seen a BMS system where someone can login to the building network and monitor/control all sorts of...
View Articlepowerflex 700 issue
the drive is F13(GROUND FAULT) Its a intermittent issue when the motor is starting. we have checked everything i can think of. insulation on the cable good.no wire same to be grounded. we meggered the...
View ArticleWhy would you need a hand off auto, and a stop start?
I am kind of new with industrial motor controls. Why would you need a hand off auto and also a stop start button? Thank you for your help. P.S. The bulb is out on the green light.
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Analog Ground Fault Amp Meter
Does anyone know how these analog Ground Fault Amp meters work? Its mounted right next to the 208/120v 3 phase step down transformer. I cant find much documentation online.
View ArticleAnyone familiar with Siemens PCS7 (V.9) here?
I've been searching online and in what little literature we have for some icon descriptions for the smaller icons that appear in the displayable on-screen blocks, a Dose Block in this instance. I know...
View ArticleVFD Splice STP
Situation: existing shielded pair too short to reach new vfd terminals. Obvious solution: pull new stp. Alternative solution and question: install terminal block inside the new drive, splice existing...
View ArticleVFD external control of fan
I've install (3) WEG CW300 VFD's in a cabinet and need to add a cooling fan to the enclosure. While I don't normally work with VFD's I didn't want to send a long time client elsewhere for this project....
View ArticleOff Delay Timers in Series
A customer of mine wants to start a sequence utilizing two timers in series once the "Wireless Controller" contact is closed. I did the logic in PLC but then the customer changed his mind when he found...
View ArticleStar Delta troubleshooting
A customer has a table saw that suddenly won't run. When you press start, the main (K1M) and star contactors (K3M) pull in, but the motor doesn't turn. When the timing relay switches to delta, the...
View ArticleMachine Xfmr question?
Folks, I am designing a control system for an industrial machine. Machine is 480VAC / 3PH powered. And I have a 480 / 120V transformer for control voltage etc. (Transformer can be wired for 240 or 120...
View ArticleRelay capacitor type/sizing help needed
I've got an old school circuit breaker with separate open and close 24VDC interposing relays to accept 3rd party control of the circuit breaker. We are experiencing momentary (1-5ms) drops on the open...
View ArticleEV charging
I recently installed a 14-50 recep. for a nissan leaf. In haste to try it out owner plugged in as i was splicing in the ground, wasnt worried until i got a good DC voltage shock. After connection was...
View ArticleBAS/BMS comparisons
Surprised after scrolling all the way back that I didn't see any discussion about the various BAS/BMS systems out there, so thought I'd get other's experiences and observations about them. My personal...
View ArticleBlinker circuit using mechanical timing relays?
Can anyone help me with a ladder diagram to make a single light turn on for 5 seconds and then off for 5 seconds? I have mechanical timing and control relays. they are 120 volt coils, and are DPDT 8...
View ArticleVFD provides voltage or the load draws?
Hello, we have a dust collector that we recently replaced the motor on to a 3 phase 5 hp motor and connected it with a 1 to 3 phase VFD. We programmed the VFD according to the manufacturer but when...
View ArticleHMI on electrical cabinet
I have a 3 phase 480 v electrical cabinet that we will be installing a new PLC in. Currently the plan is to install the HMI on the door of the cabinet. Can someone tell me if this is against code and...
View ArticleIs there too many amps or spikes to input of drive?
I have 480v, 200amp fusible disconnect going to a main cabinet of a Ward/ Flex machine. At the bottom of these fuses there are four small motors and an old dc drive that moves a 500vdc, 300amp SHUNT...
View ArticleModbus cabling?
I have a question about wiring a "daisy chain" architecture between Modbus capable devices. Of course you need two pairs for each device. One pair coming from a previous device, and another pair going...
View ArticleConnected Components Workbench CCW better versions?
I need to upgrade a machine with 2 1336 PLUS II vfds with 2 Powerflex 755s. My PLC is a CompactLogix L33. From CCW version 10 thru the latest version are there any versions that are better or worse to...
View ArticleModbus RS485 Ground vs Drain
Was looking at this drawing, doing some research, and considering how we are actually wiring devices. We use shielded, twisted pairs with a drain wire for DC power, analog signals, and RS485...
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