DEIF LSU-113DG Servo module specification

DEIF LSU-113DG Servo module specification

DI & DO shielding may be electrically continuous metal conduit, cable armor, or completely enclosed metal cable ways, as well as shielded cable, as long as the items listed are grounded only to the cabinet housing the MicroNet system and are electrically continuous between the field termination and cabinet. Unshielded I/O cables may only be used inside the cabinet that is restricted to very short distances near the cabinet. Also short, on engine, sections of Discrete Input (DI) & Output (DO) cables may be used from the engine junction box were they are restricted to be on the engine/turbine. See application note 51204 for a more detailed discussion on shield terminations. The length of exposed wire extending beyond the shield should be limited to 25 mm (1 inch). If the panel that the control chassis and FTMs are mounted on is not at earth ground potential, connect it to earth ground via a 4 mm² (12 AWG) green/yellow wire or braid, keeping the wire or braid as short as possible. The mounting panel should be well grounded to protective earth via the cabinet structure or ground straps that are low RF impedance. Low RF impedance: length not greater than 4 times the cross-sectional circumference of the ground strap.

For compliance with EMC standards

 it is required that all analog and discrete input / output wiring be separated from all power wiring. Power wiring leaving the cabinet housing the MicroNet may couple noise if not segregated and routed directly against the grounded metal of the cabinet & mounting plates. If segregation is not possible, a line filter of at least 20 dB attenuation is needed.Signal lines, mainly Analog Outputs and Actuator Outputs, send the system ground (DGND) out of the control as part of the field wiring. Take great care in wiring the field devices with cable runs longer than 30 m (100 feet), so that DGND does not become referenced to Protective Earth. When there is significant transient ground bounce and the ground potential at the control and field device is significantly different (significant resistance between the two points), referencing DGND to Protective Earth at the field device can cause system disruptions in some VME modules.

A significant potential difference in Protective

 Earth grounds generally arises when the physical distance between protective earth points is longer than 30 m (100 feet), but may happen any time there is a significant enough inductance and/or resistance. Transient ground bounce is caused when there is a nearby lightning strike, or nearby switched, high current, heavy inductive loads are switched off. The control DGND is referenced to Protective Earth internally to the control via capacitance and local shielded cabling capacitance. If the field device’s Protective Earth is referenced to DGND, transient ground bounce is placed across the control DGND and field device via the low impedance cabling. The transients can significantly disrupt some modules. Some ways DGND to Protective Earth referencing happens are as follows:  Connecting DGND to Protective Earth directly in the field device.  Connecting multiple cable shields directly to protective earth at the field devices, with cable runs and device to control separation longer than 30 m (100 feet).

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