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Forum Drivers Variable Frequency Drives for Spindles Delta Variable Frequency Drive - VFD-B series

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The Delta VFDs are produced by Delta Electronics, Inc. of Taiwan. Catalogue, Manuals.

Author Message   Gerald_D Registered Username: Gerald_d Post Number: 108 Registered: 11-2005 Posted on Friday, June 02, 2006 - 01:22 pm:        A question to kick off this topic.... The MO1, MO2, MO3 multifunction photocoupler outputs of the Delta VFD-B can surely drive Solid State Relays (SSR's) directly.... I have some Crydom D2W202F SSR's. Input spec is 3-32VDC, 1500 ohm, typical input current 3 mA, turns on at 3VDC, turns off at 1VDC. The Delta Manual says max output 48V DC, 50mA. Could I drive those Crydoms from it? Would I need a "dropping" resistor? (about 4k7 ?)   Mike Richards Registered Username: Richards Post Number: 7 Registered: 05-2006 Posted on Friday, June 02, 2006 - 03:18 pm:        Gerald, Page 2-23 in the VFD-B manual shows a better connection diagram than page 2-14. It looks like the M01, M02, and M03 share a common ground (MCM). It also looks like they SINK current. To make things really simple, I would connect 5VDC to one side of a 1/4 watt resistor, either 330 ohm or 470 ohm (either would work well). The other side of the resistor would be connected to the + (positive) control input on the Crydom SSR. The - (negative) control input of the Crydom would be connected to M01, M02 or M03. The MCM on the VFD would be connected to the 5vdc supply's GROUND. When the M01, M02 or M03 is turned on, it will SINK some current through the Crydom SSR, thus turning on the Crydom's internal photo diode, which will activate the SSR. Whatever is connected to the 'business' side of the SSR will do its job. Most SSRs that I've used drop about 1 volt, or so, across the internal photo diode, so a 330 ohm or 470 ohm 1/4-watt resistor gives you about 10ma to 12ma of current without producing too much heat. After posting, I looked at page 2-12 one more time. It looks like the outputs are already assigned a default use by the factory. Since I'm not in my shop, I can't look at my unit, but I would imagine that you would just disconnect and tape off any wire that is connected to the M01, M02, or M03 outputs.   Gerald_D Registered Username: Gerald_d Post Number: 110 Registered: 11-2005 Posted on Friday, June 02, 2006 - 05:54 pm:        Hi Mike, thanks for looking at this. My manual (both original and downloaded pdf) only has 2 pages in Chapter 2, while Chap. 3 has 17 pages. I can't find the diagrams you mention. But I do now understand the sink situation. Thanks.   Mike Richards Registered Username: Richards Post Number: 8 Registered: 05-2006 Posted on Friday, June 02, 2006 - 06:44 pm:        I found the manual at http://www.delta.com.tw/product/em/ac_motor/ac_motor_manual.asp (My manual is tucked away inside the Alpha's door pocket so I won't loose it - which means that it's easier to read the manual on-line than it is to crawl under the machine to fetch the paper manual.)   Gerald_D Registered Username: Gerald_d Post Number: 111 Registered: 11-2005 Posted on Friday, June 02, 2006 - 08:41 pm:        That's a later edition - October 2005. Yes, much better pictures and descriptions all over the manual about other things too. Thanks!