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GSDA-RTU-4A Modbus Com Card Question
I would like to find out what does the potentiometer do on the GSDA-RTU-4A? I do not find any reference to it in the manual.
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I suppose that is not all that surprising these days, but it is irritating when stuff like that is missing from the manual. Since the device does have a manual mode, my guess would be that the pot is the speed control in manual mode, but that is only a guess.
It looks like it is only a double sided board (not multi layer) and the solder side seems very simple so it probably wouldn't be too hard to trace the circuit enough to get a reasonably good idea.
Thank you Tinker, but I just checked and it is not quite that. It is like an Max speed trim( I would call it Gain) on the external pot for manual speed setpoint. I will check more closely tomorrow on this.
The GSDA-RTU-4A user manual speaks to the issue, though perhaps not directly. From the user manual, page 5:
I have my system running and yes the jumping P1 to P2 will activate the Modbus Card, therefore my PLC will control the drive from the GSDA-RTU-4A. If I remove the jumper the original Manual Speed Setpoint Pot will set the speed of the Motor. I am actually trying to figure out what the Pot on the Modbus Card does and so far from my testing what I can see, the pot on the Modbus card determines at what percentage of the Manual Speed Setpoint Pot will determine the max speed of the motor, therefore it is a GAIN on the manual speed setpoint pot. The manual does not explain what this pot does.
The pot on the RTU board is R29.
The base control being the GSD4A drive itself. Adjusting R29 will change the voltage in the potentiometer circuit.