====== Connecting to Powtran frequency drives ======

The Powtran model 9130A is used to show WebHMI connection example over RS-485.

{{ network:powtran_terminals.png?direct&600 |}}

The drives have default protocol option that needs to be changed to "1". 

^ Pr. 9-05 | 0 - non - standard Modbus (default) |
^:::       | 1 - standard Modbus  |

With right protocol setting it is possible to control the drive with these parameters:

^ Pr. F0.03| = 9 (Frequency source) |
^ Pr. F0.03| = 2 or 3 or 4 (run/stop source) |
^ Modbus register 1000h (HR4096)| Write -10000..+10000 corresponding to -100.00% + 100.00% of rated drive frequency |
^ Modbus register 2000h (HR8192)| Write 1 (run forward), 2 (run backward), 6 - stop with deceleration time |
^ Modbus register 2001h (HR4097)| Read actual speed  |