Hello all,
I am in the process of retrofitting a Milltronics BR50 bridge mill. The drives are Panasonic Sigma SGDB analog servo drives.
I am using a 7i97T for drive control and a 7i84U for additional i/o.
The problem I am having is that the analog outputs on the 7i97T don't seem to be putting out enough voltage when connected to the Panasonic drives. When nothing is connected to the 7i97T, a multimeter on the analog outputs reads the expected +/- 10V when set via HAL. However, with the drives connected, the voltage drops to almost 0.
If I put the multimeter in series with the analog output, set to output 10V, to measure current the voltage drops to a fraction of a volt and the current reading on the meter shows about 80mA. One of the little green LEDs on the 7i97T also dims slightly.
The weird thing is that if I use a 3V coin cell connected to the drive's analog in with the same meter in series, the current only measures at 0.1mA. Also, measuring the impedance/resistance of the drive's analog input shows a resistance of around 37kOhms. This is using the same wires as used by the 7i97T, so I don't think it is a wiring fault.
I don't think it's a HAL problem since the expected voltages can be output via HAL to the disconnected board, and I don't think it's the drive or wiring since the tiny coil-cell battery works. I'll attach my work-in-progess HAL/INI files below.
Is it possible that the problem lies in the 7i97T? The problem occurs on all the analog outputs and with all three servo drives.
