Product Description:

The VT-HNC100-1-1X-114 digital axis controller is produced by Bosch Rexroth Indramat within its VT-HNC Digital Axis Controllers series. Designed as the control node for one hydraulic axis, it closes the loop between a displacement transducer and a proportional or servo valve in industrial automation systems. By executing motion profiles and processing sensor signals, the unit positions cylinders, regulates force, and synchronizes movement with higher-level PLCs on production machinery.

At the core of the controller is a 16/32-bit MC68376 microprocessor that runs interpolation and PID tasks while exchanging data via PROFIBUS-DP at up to 12 MBaud. Program data and parameter sets reside in 1 MB of flash EPROM, with nonvolatile backups stored in an 8 KB EEPROM. Dynamic variables are kept in 256 KB of RAM so tuning changes can be made without cycle delays. The electronics draw only 8 W, which is useful when multiple axes share a cabinet power supply. An RS232 port operating at 9.6 KBaud provides direct PC access for local setup. Current and voltage reference signals are digitized with 5 µA and 5 mV resolution, then regenerated by a 16-bit DAC for precise valve control.

The signal chain is matched to typical hydraulic sensors. Encoder feedback is accepted at frequencies up to 250 kHz, allowing high-speed position loops on short-stroke cylinders. For analog inputs, the current channel presents 100 Ω ±0.2% of resistance, and the voltage channel presents 200 kΩ ±2%, so transducers can be driven without extra buffers. Output stages deliver commands with a granular step of 1.25 mV into 1 kΩ voltage loads or 500 Ω current loads. All analog references swing around ±10 V ±25 mV, which matches the standard range used by valve amplifiers. Series 1 hardware meets these figures while keeping the power stages thermally stable.