Add Switches to TekPower TP-3005D-3 Power Supply - Page 1
Forum section: electronics / beginners

author: jobog
author_rank: Regular Contributor
timestamp: April 04, 2016, 03:10:43 am
content: I recently purchased a TekPower TP-3005D-3 power supply. The supply has 2 regulated outputs and a constant 5v output. I wanted to add switches to the 2 regulated outputs and the following is how I accomplished this along with several pictures. I would appreciate hearing from anyone who thinks this was not a good idea and would be happy to help anyone who wants to do the same.BOM2 - 12V, 250A Latching Push Button switches with green LED indicators1 - 5V dual relay board. Relays are rated for 30V, 10A DC and will trigger high or low depending on the jumper settings2 - Nylon washers to isolate front output jack from circuit board2 - Nylon spacers to isolate relay board from case18ga stranded hookup wirevarious crimp connectors both spade and roundThe switch LED indicators are rated for 12V but will light sufficiently with 5V applied.Switches require 16mm holes for mounting. I drilled the holes with a 5/8" forstner bit which turned out to be a perfect fit.Switches have 5 terminals and you must use 4 of them. Put a jumber between the normally open terminal and the + terminal and the LED will light when the switch is on. Run 5V from the power supplies +5V output to the switch common. The 5V negative goes to the minus terminal on the switch. The relay trigger is wired to the switch normally open terminal.Mount the relay board in a convenient location using nylon spacers to isolate the bottom of the board from the case. Run wires from the power supplies + and minus outputs to the relays + and minus inputs. Run wires from the normally open terminals on the switches to the relay boards N1 and N2 inputs. Isolate the front panel output jacks from the circuit board using nylon washers and run wires from these jacks to the normally open terminals on the relay board. Run wires from the regulated outputs to the common terminals on the relay board.The relay board draws 75mA when one relay is active and 150mA when both are activated.The first picture is the front of the switch mounted to the front panel.Second picture is the back of the switch.Third picture is the relay board.Fourth is the output jack showing the nylon washer isolating it from the circuit board.Fifth is the output jack with a wire mounted to run to the relay board.

author: jobog
author_rank: Regular Contributor
timestamp: April 04, 2016, 03:12:29 am
content: Sixth is the relay board mounted with nylon spacers.Seventh is the wired relay board.Eight is the power supply on with the switch off. The green halo appears to be on but it is not. It is only the reflection of the flash. Meter shows no voltage to the output jack.Ninth is with the switch on showing the 14.5V set on the supply.When using the supply as constant current both switches must be on to set the current as the outputs must be shorted to set the current.

author: jobog
author_rank: Regular Contributor
timestamp: April 04, 2016, 03:25:15 pm
content: Just to clarify, when setting constant current only the switch for the output you are setting needs to be on. My last post made it appear that both switches had to be on.