CE Certified Bag Making Machine Technical Deep Dive: EMC Compliance and Electrical Safety
In addition to functional safety, CE certification requires bag making machines to comply with the EMC Directive 2014/30/EU and the Low Voltage Directive 2014/35/EU. This means the machine must not generate electromagnetic disturbances that exceed limits (emission), and it must be immune to external disturbances (immunity). The relevant standards are EN 61000-6-4 (emission for industrial environments) and EN 61000-6-2 (immunity for industrial environments). The machine's electrical system must also comply with EN 60204-1 for electrical safety. EMC compliance is critical because bag making machines use powerful servo drives, high-frequency switching power supplies, and communication networks that can emit conducted and radiated noise. The emissions are measured in the frequency range 30 MHz to 1 GHz (radiated) and 150 kHz to 30 MHz (conducted). To reduce emissions, the machine's control cabinet must be constructed from conductive metal (steel) with good continuity between panels, and all cable entries must use EMC glands. The servo drives' input and output cables must be shielded, with the shield grounded at both ends (or at one end depending on the drive's instructions). The motor cables must be kept separate from signal cables to prevent coupling. Ferrite cores are placed on power cables to suppress high-frequency noise. A line filter is installed at the mains input to reduce conducted emissions.
Immunity testing involves subjecting the machine to electrostatic discharge (ESD, 8 kV air / 4 kV contact), radiated RF fields (10 V/m), fast transients (burst, 2 kV), surge (1 kV line-to-line, 2 kV line-to-ground), and voltage dips/interruptions. The machine must continue to operate without errors during and after these tests. To ensure immunity, the control system's power supply must be filtered and have a hold-up time of at least 20 ms to ride through short dips. All I/O connections must be protected with transient voltage suppressors (TVS) and RC snubbers for inductive loads. The grounding system must be a star point (single-point ground) to avoid ground loops. The PE (protective earth) conductor must have a cross-section sufficient for the fault current; typically, it is the same size as the line conductors. The control cabinet is connected to the main earth busbar with a low-impedance path.
Plastic Bag Making Machine
Electrical safety per EN 60204-1 covers protection against electric shock, overcurrent, and thermal hazards. The machine must have a main disconnect switch that locks in the OFF position, a short-circuit protective device (fuse or circuit breaker), and residual current devices (RCDs) if needed. All live parts must be enclosed in IP2X cabinets. The control circuit must use safety extra-low voltage (SELV) or protective extra-low voltage (PELV) for operator controls. The wiring must be color-coded: brown/black for line, blue for neutral, green/yellow for PE. The insulation resistance must be >1 MΩ at 500V. The machine must be protected against over-temperature with thermal switches on motors and heaters. The emergency stop switch must have red mushroom head on yellow background.
Documentation: The CE certification requires a technical file that includes electrical schematics, cable routing diagrams, component datasheets, EMC test reports, and the risk assessment. The operator manual must include safety instructions and maintenance procedures. The machine's nameplate must show the CE mark, manufacturer, model, serial number, power rating, and year of manufacture.
Pre-compliance testing: Many manufacturers perform pre-compliance EMC measurements using a spectrum analyzer and near-field probes to identify potential issues before going to an accredited lab. This reduces the cost and time of formal testing. For example, if the radiated emissions are high, the engineer may add additional ferrites or change the shielding. The final testing is done by a notified body or an accredited test lab. The test report is kept as part of the technical file. By ensuring EMC and electrical safety compliance,
CE certified bag making machines not only meet legal requirements but also operate reliably in industrial environments, reducing the risk of malfunctions due to electromagnetic interference.
