The CMGZ309.R is FMS's compact single-channel digital tension controller, purpose-built for unwind and rewind stations on web-processing lines. Its 1 ms PID loop and built-in Ethernet interface — accessible from any browser — mean commissioning and diagnostics happen without dedicated software or a panel HMI.

What makes the .R variant different from other CMGZ309 versions?

The .R suffix designates DIN-rail mounting. FMS also offers the same controller in wall-mount (IP65) and panel-mount enclosures. The core electronics, I/O count, and web interface are identical across all three; the enclosure determines where the controller physically lives on the machine. An EtherNet/IP variant — CMGZ309.R.EIP — adds fieldbus integration with cycle times down to 2 ms.

How is the controller wired into a tension loop?

Up to two force sensors connect directly to the ±9 mV differential input. The PID stage drives either a voltage output (0–10 VDC into ≥1 kΩ) or a current output (0/4–20 mA into ≤500 Ω) to a brake, clutch, or variable-speed drive. Two galvanically isolated 24 VDC digital inputs handle enable, emergency stop, brake release, or PID set selection — configurable via the web interface or the 2-line LCD keypad on the front face.

What built-in signal processing reduces setup time?

Beyond the standard PI/PID selection, the CMGZ309.R includes a switchable low-pass filter (0.1–200 Hz cutoff, default 10 Hz), automatic sensor offset compensation, a start-up ramp function, and taper tension for center-wind applications. Limit monitoring with programmable relay thresholds catches web breaks and overloads without an external PLC watchdog.

Frequently Asked Questions

Does the web interface require special software?

No — any standard browser on the same network can access the full parameter set, I/O status, and diagnostic log. No plugin, Java runtime, or engineering tool is needed.

Can the CMGZ309.R drive both a brake and a motor simultaneously?

It is a single-channel controller with one analog output. If the application requires dual-channel control (e.g., one brake and one drive on the same station), consider a two-channel controller or cascade two CMGZ309 units.