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The 1440BV manual does not show the VFD connections, but most likely the the JOG button is direct signaling connection to the VFD, as opposed to a relay activated command. The schematic only shows a Forward/Reverse relay (and a gate/power relay). The first thing I would check is that all the VFD pin connectors (low voltage 24VDC inputs) are secure, the spring clasp sometimes does not secure the pin or make good contact. I would push each one in and then give a little tug to each to make sure it is secure. There is no depiction of the VFD terminal connection in the Shihlin Electric VFD SS2 Manual, but it looks like the default is setup for the inputs is in a sink configuration, the inputs are at 24VDC and when connected to the SD (ground/0V for the 24VDC circuit) it will activate the input. The inputs that are used is STF for forward, STR for reverse, and I am assuming that M0 input is reprogrammed for jog. Check the wires going to these terminals. You can check the continuity of the jog circuit switch and wiring with an ohmmeter (with the power off), alternatively you could connect a voltmeter to the SD (black meter lead) and to M0 (assuming this is the jog input or could be RES) and see if there is 24VDC when the jog button is pressed. there are several different options, but the first is to check the continuity of the jog wiring to the switch and back with an ohmmeter. One could directly activate a VFD input to bypass the wiring/switch to check if there is a VFD fault with a specific input, but I would check with QMT first and see what they recommend.
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