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We need a high-speed optical coupler to interface any PLC with 24VDC outputs to a servo drive with pulse and direction inputs.
The drive input is internally pulled up to 5 VDC with a 1K Ohm resistor. However, there is also about a 1.5K Ohm resistor that internally goes from the drive input to logic common. So there is about 3 VDC from the drive input to common with nothing connected to the drive. We need to pull the drive input to common with an open collector from a opto-coupler module (the input to the opto-coupler is the PLC output). We tried a Phoenix Contact DEK-OE-24DC/24DC/100KHz but the output transistor would not turn on enough to pull the drive input to common (we hooked the drive input to output terminal + and drive common to output terminal 0). The minimum operating
voltage for this item is 4 VDC so that may be the problem.
This is a very common requirement for us and we would like to have a standard interface opto-coupler module that we could recommend for this
application. The drive can accept up to a 600KHz pulse frequency but an opto-coupler module that can operate up to 50-100KHz would be enough for
most applications. Any suggestions?
George Kaufman
[email protected]
The drive input is internally pulled up to 5 VDC with a 1K Ohm resistor. However, there is also about a 1.5K Ohm resistor that internally goes from the drive input to logic common. So there is about 3 VDC from the drive input to common with nothing connected to the drive. We need to pull the drive input to common with an open collector from a opto-coupler module (the input to the opto-coupler is the PLC output). We tried a Phoenix Contact DEK-OE-24DC/24DC/100KHz but the output transistor would not turn on enough to pull the drive input to common (we hooked the drive input to output terminal + and drive common to output terminal 0). The minimum operating
voltage for this item is 4 VDC so that may be the problem.
This is a very common requirement for us and we would like to have a standard interface opto-coupler module that we could recommend for this
application. The drive can accept up to a 600KHz pulse frequency but an opto-coupler module that can operate up to 50-100KHz would be enough for
most applications. Any suggestions?
George Kaufman
[email protected]