Ropex RES-403 microprocessor-based Resistron temperature controller for sensorless closed-loop control of heat-sealing bands, rated for 400 VAC line supply. Unit is in good working used condition with multiple status LEDs and pluggable terminal blocks; see photos/label for wiring and settings.
Brand: Ropex Industrie-Elektronik GmbH
Model: RES-403
Part no.: 740303 (RES-403/400VAC variant)
Type: Heat-seal temperature controller (Resistron series), rail/panel mounting
Line supply: 400 VAC (380–415 V AC range, 50/60 Hz) per nameplate and product listings
Control principle: Sensorless closed-loop control via monitoring band resistance (current and voltage) for impulse or continuous heating elements
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Inputs:
Mains terminals for line/filter (see terminal diagram on side label)
Control inputs for START and AUTOCAL via isolated 24 V DC or potential-free contacts
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Outputs and signals:
“HEAT + 24VDC” drive output for external solid state relay or power stage (see terminals 12–14 on label)
0–10 V DC analog output for actual temperature feedback (TEMP. OUT)
Alarm relay output max. 50 V / 200 mA (ALARM)
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Front indicators and controls:
LEDs for AUTOCAL, OUTPUT, HEAT, ALARM status
Rotary switch for temperature/alloy configuration with ranges up to 500 °C; selectable alloys A20, A20L and NOREX (see front chart)
Internal DIP switch bank for line voltage and U2 ranges (e.g. 0–100, 60–200, 120–400 V) as printed on side label
Integration: Designed for use with Ropex heat seal transformers (PTR/TR-x), temperature meters (ATR-3/ATR-5) and potentiometers (PD-3/PD-5)
Country/Region of manufacture: Germany (“Made in Germany” on label).
Used, in good working condition.
Cosmetic wear consistent with normal panel service: scuffs, scratches and some discoloration on housing; terminal labels and printing remain fully legible (see photos).
All green pluggable terminal blocks present, many with existing labeled wires that can be removed or reused.
No original documentation, accessories, external transformers, potentiometers or display units included.
This is the 400 VAC line version RES-403/400VAC, suitable for 3‑phase sealing systems in the 380–415 V range; verify line voltage and DIP switch configuration for your installation.
Supports Autocal, Autotune, Autorange and Autocomp functions for simplified commissioning and automatic adaptation to different band lengths and alloys.
Ideal as a replacement controller in existing Ropex heat-sealing systems; newer RES-500x series are suggested by Ropex as functional successors if upgrading.
Professional installation and parameterization according to the Ropex manual are strongly recommended; sold as a used industrial controller.
