Re: Step2Linear - Interface with Parker Compumotor BLH
I was seeking anyone who has experience using the viper step2linear boards.
I have a new Step2Linear board almost working with a Parker BLH150 servo drive. I have Step2Linear powered up, I've been able to establish communications, I have the low power voltage divider providing 14V to the low power connections. My issue is fooling the Parker drive to not be giving me a OVERTEMP alarm signal at the moment it is powered up. It is not hot or operational. I interpret this as a cable missing fault. The self contained drive/motor combination worked as a pair for the initial test to balance the shaft motion. Now that the encoder cable is separated and broken out to interface with the Step2Linear board, the Parker servo drive is not happy that there is not an encoder cable hooked up to its DB-25 interface.
The encoder drive's DB-25 connections have the differential A,_A, B,_B, Z,_Z etc... It also has MOT and *MOT which are associated with OVERTEMP. I was going to try to short these two or pull them to ground or +5V with a resistor but thought I should seek some advice if anyone had any experience fooling the drives to believe the encoder cable is still hooked up to the drive.
I am still working on the inhibit circuit for the Step2Linear but know that the drive is currently unsatisfied with the missing encoder cable. It is not providing motor power at all.
The other way would be to use the auxiliary encoder signals from the servo drives 15-pin user interface to feed the step2linear but this appears contrary to the viper installation manual. The manually clearly shows the motor to be interfaced directly to the Step2Linear not connected to the drive's encoder input
If anyone out there has any advice, I would be grateful. Thanks
Adam
pin 6-7 page 21 in section 3
http://www.compumotor.com/manuals/BL/BLH.pdf