E94AYAB Lenze 9400 Series SM100 Safety Module

Product Overview

The E94AYAB (E94AYAB) is the SM100 functional safety module designed specifically for the Lenze 9400 HighLine servo drive system. This module serves as the fundamental building block for machine safety, providing the essential Safe Torque Off (STO) function. By integrating the E94AYAB directly into the 9400-series drive, engineers can reliably prevent the motor from starting unexpectedly, ensuring a torque-free state without the need for high-wear external power contactors. This German-engineered module is critical for modern B2B automation environments—such as high-speed packaging, textile machinery, and robotic cells—where rapid intervention is required. It allows for a streamlined safety architecture that meets stringent global safety standards while reducing wiring complexity and decreasing the footprint of the electrical control cabinet.

Technical Configuration

The E94AYAB SM100 is a pluggable hardware expansion that installs directly into the designated safety slot of any Lenze 9400-series drive. Its primary architecture focuses on dual-channel safety inputs which, when de-energized, immediately inhibit the drive's internal power transistors at a hardware level. This ensures that even in the event of a software malfunction or control system failure, the motor cannot generate torque. The module is designed for "Active" status in the product lifecycle, meaning it is compatible with the latest firmware revisions of the 9400 HighLine platform. Its lightweight, 0.09 kg design does not affect the drive's thermal profile, yet it provides the high-reliability switching required for Safety Integrity Level 3 (SIL 3) and Performance Level e (PL e) applications.

Technical Specifications

Technical FAQs

What is the specific safety function provided by the E94AYAB?

The SM100 module provides the Safe Torque Off (STO) function. This is a basic safety measure that ensures no power-generating energy can act upon the motor. It is the prerequisite for safe machine stops where no external force (like gravity) can cause a hazardous movement once torque is removed.

Can this module be used for Safely Limited Speed (SLS) applications?

No. The E94AYAB (SM100) is dedicated to the STO function only. For more advanced motion-related safety functions like SLS (Safely Limited Speed) or SDI (Safe Direction), you must utilize the SM301 (E94AYAE) module within the 9400 series.

How do I verify that the safety module is functioning correctly?

The SM100 features a testable design. During commissioning, you should perform a "forced dynamization" or feedback check via the drive's internal status bits to ensure that both safety channels are responding correctly to the emergency stop circuit.

Engineering & Installation Guide

• Dual-Channel Wiring Requirement: To achieve SIL 3 / PL e rating, the E94AYAB must be wired into a dual-channel safety circuit. This involves two independent 24 VDC signals from a safety relay. If only a single channel is used, the safety rating of the entire machine will be significantly downgraded, potentially failing local safety inspections.

• Slot Installation and ESD Safety: The SM100 module must be inserted into the drive while all power (including 24 VDC control power) is off. Use an anti-static wrist strap during installation to prevent damage to the high-sensitivity CMOS components. Ensure the module is pushed firmly into the slot until the locking mechanism engages to prevent "Module Missing" faults.

• Safety Feedback Loop: It is highly recommended to monitor the drive's "Ready" or "STO Active" status back to your master safety PLC. This ensures that the safety system can detect if a module has been physically removed or if an internal fault has occurred within the drive’s safety logic.