Hey
I have a Micrologix 1500 with an analog Input module hooked up to a variable frequency drive so i can monitor the RPM it is putting out. I have the VFD Configured to ouput 0-10volts. The problem I am having is that the input i am getting through the analog input card is a negative number. For example, right now i have the VFD setup to output 40 Hz which is 6.67 volts. The problem is my Analog Input displays this 6.67 volts as -500.
Here is how i have Analog input module setup:
- the channel is enabled
- data format is Engineering Units
- data range 0-10 volts
- I have the input from the VFD wired into the voltage in on the module
Can anybody tell me why i am getting a negative input ? How do i configure the input so i will get a number like 7000 when the VFD is outputting 7volts ?
Sorry for the newbie question but this is the first time i have used analog input and output modules
Thanks for any help
Barry
I have a Micrologix 1500 with an analog Input module hooked up to a variable frequency drive so i can monitor the RPM it is putting out. I have the VFD Configured to ouput 0-10volts. The problem I am having is that the input i am getting through the analog input card is a negative number. For example, right now i have the VFD setup to output 40 Hz which is 6.67 volts. The problem is my Analog Input displays this 6.67 volts as -500.
Here is how i have Analog input module setup:
- the channel is enabled
- data format is Engineering Units
- data range 0-10 volts
- I have the input from the VFD wired into the voltage in on the module
Can anybody tell me why i am getting a negative input ? How do i configure the input so i will get a number like 7000 when the VFD is outputting 7volts ?
Sorry for the newbie question but this is the first time i have used analog input and output modules
Thanks for any help
Barry