VLT® Functional extensions

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Functional extensions increase the flexibility of an AC drive by extending I/Os and by providing dedicated interfaces for a wide variety of feedback devices.

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  • Offers an extended number of control inputs and outputs
  • 3 digital inputs 0–24 V: Logic ‘0’ < 5 V; Logic ‘1’ > 10V
  • 2 analog inputs 0–10 V: Resolution 10 bit plus sign
  • 2 digital outputs NPN/PNP push pull
  • 1 analog output 0/4–20 mA
  • Spring-loaded connection
  • Offers the possibility to connect various types of incremental and absolute encoders. The connected encoder can be used for closed-loop speed control as well as closed-loop flux motor control
  • The following encoder types are supported:
    • 5V TTL (RS 422)
    • 1VPP SinCos
    • SSI
    • Hiperface
    • EnDat
  • This option enables connection of a resolver to provide speed feedback from the motor
  • Primary voltage......2–8 Vrms
  • Primary frequency......2.0–15 kHz
  • Primary current max......50 mA rms
  • Secondary input voltage......4 Vrms
  • Spring loaded connection
  • Makes it possible to extend relay functions with 3 additional relay outputs.
  • Max switch rate at rated load/min. load......6 min–1/20 sec-1
  • Protects control cable connection
  • Spring-loaded control wire connection
  • Max. terminal load:
    • AC-1 Resistive load......240 V AC 2 A
    • AC-15 Inductive load @cos phi 0.4......240 V AC 0.2 A
    • DC-1 Resistive load......24 V DC 1 A
    • DC-13 Inductive load @cos phi 0.4......24 V DC 0.1 A
  • Min. terminal load:
    • DC 5 V......10 mA
  • Connect an external DC supply to keep the control section and any installed option alive during power failure
  • Enables full operation of the LCP (including the parameter setting) and all installed options without connection to mains
  • Input voltage range......24 V DC +/- 15% (max. 37 V for 10 sec.)
  • Max. input current......2.2 A
  • Max. cable length......75 m
  • Input capacitance load......< 10 µF
  • Power-up delay......< 0.6 s
  • The VLT® AutomationDrive FC 302 provides a safety input based on a single pole 24 V DC input
  • For the majority of applications this input enables the user to implement safety in a cost-effective way. For applications that work with more advanced products like Safety PLC and light curtains, the Safe PLC interface enables the connection of a two-wire safety link
  • The Safe PLC Interface allows the Safe PLC to interrupt on the plus or the minus link without interfering the sense signal of the Safe PLC
  • This analog input/output option is easily fitted in the frequency converter for upgrading to advanced performance and control using the additional I/O
  • Upgrades the frequency converter with a battery back-up supply for the frequency converter built-in clock (that typically lasts for 10 years, depending on the environment). This provides stable use of all frequency converter clock functions as timed actions
  • 3 analog inputs, each configurable as both voltage and temperature input
  • Connection of 0–10 V analog signals as well as PT1000 and NI1000 temperature inputs
  • 3 analog outputs each configurable as 0-10 V outputs
  • Enables improved surveillance of the motor condition compared to the built-in ETR function and thermistor terminal
  • Protects the motor from overheating
  • ATEX-approved for use with Ex d and Ex e motors (EX e only FC 302)
  • Uses Safe Stop function, which is approved in accordance with SIL 2 IEC 61508
  • Protects the motor from being overheated by monitoring the temperature of bearings and windings in the motor
  • Three self-detecting sensor inputs for 2 or 3 wire PT100/PT1000 sensors
  • One additional analog input 4–20 mA
  • Facilitates failure analysis with advanced data-logging functionality
  • Supports preventive and predictive maintenance features
  • Adds time and date stamps to events
  • Contains a back-up battery
  • Easy to mount
  • Expand the Safe Torque Off (STO) function, which is integrated in a standard VLT® AutomationDrive. Use the Safe Stop 1 (SS1) function to perform a controlled stop before removing torque. Use the Safely Limited Speed SLS function to monitor whether a specified speed is exceeded
  • The functions can be used up to PL d according to ISO 13849-1 and SIL 2 according to IEC 61508
  • Additional standards-compliant safety functions
  • Replacement of external safety equipment
  • Reduced space requirements
  • 2 safe programmable inputs
  • 1 safe output (for T37)
  • Easier machine certification
  • Drive can be powered continuously
  • Safe LCP Copy
  • Dynamic commissioning report
  • TTL (MCB 150), sensorless operation (MCB 151 with MCB 159) or HTL (MCB 151) encoder as speed feedback
  • Enables activation of Safe Torque Off (STO) via the PROFIsafe fieldbus in combination with VLT® PROFINET MCA 120 fieldbus option. It improves flexibility by connecting safety devices within a plant
  • Safety functions are implemented according to EN IEC 61800-5-2
  • Supports PROFIsafe functionality to activate integrated safety functions of the VLT® AutomationDrive from any PROFIsafe host, up to Safety Integrity Level SIL 2 according to EN IEC 61508 and EN IEC 62061, Performance Level PL d, Category 3 according to EN ISO 13849-1
  • PROFIsafe device (in combination with MCA 120)
  • Replacement of external safety equipment
  • 2 safe programmable inputs
  • Safe LCP Copy
  • Dynamic commissioning report

The VLT® Safety Option MCB 151 extended with the VLT® Sensorless Safety MCB 159 option provides safe sensorless speed functions (SS1/SLS/SMS) for VLT® AutomationDrive FC 302.

With the MCB 159 option, an external sensor is no longer required for safe speed monitoring.
Select VLT® Sensorless Safety MCB 159 as a C1 option in the configurator when ordering a new drive.
MCB 159 is not available for retrofit.

MCB 159 is only available as an extension to MCB 151.

  • Easy to fit
  • Upgrades the built-in cascade controller to operate more pumps and provide more advanced pump control in master/follower mode
  • Up to 6 pumps in standard cascade set-up
  • Up to 5 pumps in master/follower set-up
  • For technical specifications, see VLT® Relay Option MCB 105
  • Adds inputs/outputs for increased flexibility
  • 7 digital inputs
  • 2 analog outputs
  • 4 SPDT relays
  • Meets NAMUR recommendations
  • Galvanic isolation capability


Type Name Language Valid for Updated Download File type
Installation guide Safety Option MCB 150/151 Italian Multiple 24 Apr, 2019 3.4 MB .pdf
Installation guide Safety Option MCB 150/151 French Multiple 24 Apr, 2019 3.6 MB .pdf
Installation guide Safety Option MCB 150/151 English Multiple 07 Jan, 2019 3.3 MB .pdf
Installation guide Safety Option MCB 150/151 German Multiple 24 Apr, 2019 3.4 MB .pdf
Installation guide VLT® Extended Relay Card MCB 113 Spanish, Castilian Multiple 15 Jan, 2021 29.2 MB .pdf
Installation guide VLT® Extended Relay Card MCB 113 French Multiple 15 Jan, 2021 29.2 MB .pdf
Installation guide VLT® Extended Relay Card MCB 113 English Multiple 15 Mar, 2020 29.0 MB .pdf
Installation guide VLT® Extended Relay Card MCB 113 German Multiple 15 Jan, 2021 29.1 MB .pdf
Operating guide VLT® PTC Thermistor Card MCB 112 English Multiple 18 Nov, 2022 1.8 MB .pdf
Operating guide VLT® PTC Thermistor Card MCB 112 German; English Multiple 19 Dec, 2023 3.0 MB .pdf
Installation guide VLT® Safety Options MCB 150,151, 152_ML English Multiple 11 Oct, 2022 1.4 MB .pdf