Siemens Variable Frequency Drive Modules

General

The Variable Frequency Drive (VFD) Modules receive AC from the Power Distribution Panel. The VFD Panel then supplies the required power to a device, such as a trunnion or conveyor system. There is one (1) VFD located on the 2V02 Underbody Structure Cell.

Some of these units are equipped with a disconnect switch that will remove all power from the VFD module. This is not on all of the modules through-out the line, but those that have it will have the switch located directly next to it.

Item Description Function
A Disconnect Switch Rotary Disconnect switch that will remove power from the VFD module and associated equipment.
Typical Siemens Variable Frequency Drive Module

Major Components

The Siemens Variable Frequency Drive Modules features the following components.

Item Description Function
A PE Grounding Terminal Connection point for grounding the unit and motor for safety and electromagnetic compatibility.
B Main Supply Connection Connection for three-phase AC power.
C Motor, Brake, and Temperature Sensor Connection Connector that holds the sensor wiring for each of these system:
  • Motor - connects the three phases of the motor (U, V, W) to terminals of the converter. This enables the unit to control the speed and direction of the motor.
  • Brake - used to connect a brake unit or brake resistor.
  • Temperature - connects temperature sensors to monitor critical components, such as the motor or the inverter itself. Temperature feedback allows the unit to adjust its operating or trigger alarms/shutdowns if temperatures exceed a limit.
D Optical Interface For Operator Panel IOP handheld. This allows communication between the unit and other control systems, such as PLCs or other automation systems.
E Converter Status LEDS Visual indicators for the following:
  • Power LED:
    • Green: Indicates that the converter is powered and ready for operation.
    • Red (Flashing or Steady): Indicates power or hardware fault.
  • Status LED:
    • Green: Indicates normal operation.
    • Yellow (Flashing): Indicates a warning or that the converter is in non-operational state.
    • Red (Flashing or Safety): Indicates a warning or that the converter is in a non-operational state.
  • Communication LED:
    • Green (Blinking or Steady): Indicates successful communication with external devices or control systems.
F 24 VDC In and Out Connectors to received 24 VDC supply power and sending 24 VDC out to other devices.
G USB PC Connector, Address, and PROFIBUS Termination Switch Connection location for a PC, address and the termination switch for the PROFIBUS.
H Fieldbus In and Out For PROFINET or PROFIBUS communication.
I Digital Outputs 0 and 1 with LED Digital outputs that can be configured and programmed to perform various functions based on the application. Outputs are often used for status indication, alarm signaling, and device controls.
J HTL Encoder Connection Connector used to interface with an HTL encoder. HTL is a type of encoder signal that operates with a high voltage threshold. The HTL encoder is typically used for position feedback, closed-loop operations, high noise immunity, and reliability in harsh environments.
K Digital Inputs 0 - 6 with LED Digital inputs that can be configured and programmed to perform various functions based on the application. Inputs are used for start/stop commands, speed reference signals, fault reset, emergency stop, and interlocking.
L SSI Encoder Connection The SSI is a serial communication protocol sued to transmit position data from encoders to control systems. This connection provides accurate position feedback to the converter, closed-loop operations, dynamic positioning and error detection.
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