Bonfiglioli Vectron EM-IO-04 module KTY temperature measurement and digital port configuration

Bonfiglioli Vectron EM-IO-04 Expansion Module KTY Temperature Measurement and Digital Port Configuration

In the engineering practice of industrial variable frequency drive systems, the accuracy and flexibility of motor temperature monitoring directly affect the safety and control performance of the equipment. Traditional PTC thermistors only provide over temperature protection for switch values, and cannot achieve continuous temperature measurement and real-time display - this limitation is particularly prominent in applications that require precise temperature compensation or status monitoring. The Bonfiglioli Vectron ACTION and ACTION Cube series frequency converters, through the EM-IO-04 expansion module, integrate the CAN system bus and introduce the continuous temperature measurement capability of KTY temperature sensors. They also provide configurable digital ports (input/output switchable) and PNP/NPN selectable digital input logic, providing a highly integrated hardware solution for complex motor control and protection requirements.

Overview and Functional Positioning of EM-IO-04 Expansion Module

1.1 Module Core Functions

EM-IO-04 is an optional hardware expansion component designed by Bonfiglioli Vectron for the ACTION and ACTION Cube series frequency converters, supporting software versions 4.2.1 and higher for the ACTION series and all ACU series devices. This module achieves the following functional extensions by inserting it into the lower expansion slot of the frequency converter:

CAN system bus interface: Complies with ISO-DIS 11898 (CAN High Speed) standard, supports up to 1 MBaud communication rate, and is optically isolated

Digital port (EM-S1IOD): can be switched to digital input or digital output through parameters

Two digital inputs (EM-S2IND, EM-S3IND): supports PNP (high level effective) or NPN (low level effective) optional

Motor temperature assessment:

PTC thermistor or bimetallic temperature sensor (normally closed contact) - limit monitoring

KTY Temperature Sensor (KTY84/130) - Continuous Temperature Measurement and Display

Three 20V auxiliary power outputs

1.2 Comparison of EM-IO series functions

Function EM-IO-01 EM-IO-02 EM-IO-03 EM-IO-04

CAN system bus support support support support (optoelectronic isolation)

Analog input 1 channel 1 channel 1 channel 1 channel none

Analog output 1 channel (voltage) 1 channel (voltage) 2 channels (voltage+current) None

Digital input 3 channels 3 channels 2 channels 2 channels+1 channel configurable

Relay output 2, 1, 1 None

PTC limit monitoring not supported, supported, supported

KTY continuous temperature measurement is not supported

PNP/NPN optional, unsupported, unsupported, unsupported

Key differentiation value: EM-IO-04 is the only module in the EM-IO series that supports continuous temperature measurement with KTY temperature sensors, while providing unique configurable digital ports and PNP/NPN logic selection functions. It sacrifices analog channels in exchange for the most comprehensive motor temperature monitoring solution and maximum digital I/O flexibility.

Key points of mechanical and electrical installation

2.1 Mechanical Installation

The installation steps are consistent with other modules in the EM-IO series:

Power off confirmation: The frequency converter is completely powered off and waiting for the DC bus capacitor to discharge completely.

Disassemble the lower cover plate: Remove the plastic cover plate on the lower part of the frequency converter.

Insertion module: Align the EM-IO-04 expansion module with the slot and apply even force to insert it, holding only the housing and avoiding contact with the PCB.

Reset cover plate: Reinstall the lower cover plate.

2.2 Electrical Connections - Detailed Explanation of Terminal Definitions

The terminal layout of EM-IO-04 differs significantly from EM-IO-01/02/03 and requires special attention.

Socket X410A (terminals 1-7):

Technical parameter description of terminal signal

1 20V output Imax=180mA auxiliary power supply

2 20V ground - corresponding to terminal 1 ground

3 digital inputs 2 (EM-S2IND) PNP/NPN optional speed sensor Track A

4 20V output Imax=180mA auxiliary power supply

5 20V ground - corresponding to terminal 4 ground

6-digit input 3 (EM-S3IND) PNP/NPN optional speed sensor Track B

7 20V output Imax=180mA auxiliary power supply

Socket X410B (terminals 1-7) - The temperature sensor interface is located in this socket:

Technical parameter description of terminal signal

1-2 temperature sensors (EM-MPTC/EM-KTY) PTC:>2.4k Ω response/KTY: 424~1722 Ω S3 switch selection mode

3 Digital Ports (EM-S1IOD) Input: 30V/16mA/Output: 24V/40mA Parameter 558 Switching

4 20V Ground - Digital Port Ground

5 CAN_Low - System Bus CAN Low Line

6 CAN-High - System Bus CAN High Line

7 CAN_SND - System Bus Ground

Key Engineering Tips:

Terminal X410B. 1-2 is a dedicated interface for temperature sensors, and PTC or KTY mode can be selected through dip switch S3.

Terminal X410B. 3 is a digital port that switches input/output modes through parameter 558.

X410A provides three 20V auxiliary power supplies (terminals 1, 4, 7) with a total load capacity of 180mA, requiring power budgeting.

2.3 Temperature sensor type selection (dip switch S3)

S3 Position Mode Sensor Type Measurement Capability

Right side (OFF) EM-MPTC PTC thermistor (DIN 44081) or bimetallic temperature sensor (normally closed contact) limit monitoring (switch quantity)

Left (ON) EM-KTY KTY84/130 temperature sensor continuous temperature measurement (analog quantity)

Motor temperature monitoring - detailed explanation of core differentiation functions

The most significant feature of EM-IO-04 is its dual temperature monitoring capability: it supports both PTC switch limit protection and KTY continuous temperature measurement.

3.1 PTC/bimetallic temperature sensor limit monitoring (S3=right side)

When S3 is placed on the right side (EM-MPTC mode), the module evaluates the resistance change of PTC thermistor or bimetallic temperature sensor (normally closed contact). The rated response resistance value of PTC is>2.4k Ω (in accordance with DIN 44081).

Operation mode (parameter 570) - consistent with EM-IO-02/03:

Application of Mode Function Engineering

Only display a warning when overheating occurs, without triggering a shutdown

12. Immediately report fault F0400 and stop the machine freely

13 fault shutdown, delayed for 1 minute, short-term overheating tolerance

14 fault shutdown, delayed for 5 minutes, suitable for overheating during the start-up phase

15 fault shutdown, with a maximum tolerance delay of 10 minutes

3.2 KTY Temperature Sensor Continuous Temperature Measurement (S3=Left) - Core New Function

This is the core function that distinguishes EM-IO-04 from EM-IO-01/02/03. When S3 is placed on the left side (EM-KTY mode), the module evaluates the KTY84/130 temperature sensor and achieves continuous temperature measurement from -20 ° C to 200 ° C.

Technical specifications of KTY84/130 sensor:

Resistance value at 100 ° C: 1000 Ω

Temperature coefficient of resistance: 0.61%/K (at 100 ° C ambient temperature)

Resistance range: 424 Ω~1722 Ω (corresponding to measurement range of -20 ° C~200 ° C)

Temperature measurement parameterization:

Select mode 22- Temp. Meas. with EM-KTY through parameter 465 (Operation Mode) to enable KTY temperature measurement.

The actual temperature value can be read through parameter 226 (Winding Temperature).

The maximum allowable winding temperature is set through parameter 617 (max. Temp. Windings), with a range of 50 ° C~200 ° C and a factory value of 150 ° C.

KTY temperature over limit response mode (parameter 570):

Mode Function Engineering Description

Only display a warning when the maximum. Temp. Windings are exceeded

22 fault shutdown immediately reports fault F0400

23 fault shutdown, delayed for 1 minute, short-term over temperature tolerance

24 fault shutdown, delayed for 5 minutes, suitable for motors with high thermal inertia

25 fault shutdown, with a maximum tolerance delay of 10 minutes

The engineering value of KTY temperature measurement:

Continuous temperature display: Operators can monitor the temperature of the motor winding in real time and predict the risk of overheating

Optimization of control parameters: Temperature values can be used to synchronize temperature related control parameters (such as stator resistance compensation in magnetic field orientation control)

Trend analysis: Judging the motor load status or cooling system efficiency through temperature change trends

Accurate protection: Compared to PTC's switch protection, KTY can achieve more precise over temperature protection threshold setting

Digital port configuration

4.1 Port mode switching

The digital port of terminal X410B. 3 can switch function through parameter 558 (Operation Mode):

Mode Function Description

0-input digital input can be used as a control signal source (such as start/stop)

1-output digital output can be used as a status indicator or to control external devices

When used as a numerical input (mode 0):

The operation mode is selected through parameter 559 (Operation Mode Output)

Can be linked to any parameterized input function inside the frequency converter

Signal source numbers: 320 (EM-S1IND), 520 (EM-S1IND inverted)

As a digital output (Mode 1):

The operation mode selection is the same as the digital output of the inverter body

Output characteristics: High level=24V, Imax=40mA, PLC compatible

PNP/NPN Logic Selection - Expanding Application Flexibility

The digital inputs EM-S2IND (X410A. 3) and EM-S3IND (X410A. 6) of EM-IO-04 support selecting PNP (high level effective) or NPN (low level effective) logic through parameters, which is the only module in the EM-IO series that has this function.

Logical selection (through numerical input operation mode):

The mode function is applicable to sensor types

0-HIGH-switching PNP input, high level (≥ 13V) effective standard PNP type proximity switch, photoelectric sensor

1-LOW switching NPN input, low level (≤ 5V) effective NPN sensor, PLC output

Signal source number:

EM-S2IND: 321 (positive logic)/521 (negative logic)

EM-S3IND: 322 (positive logic)/522 (negative logic)

Engineering value: This feature enables EM-IO-04 to be directly compatible with the vast majority of industrial sensor types on the market, without the need for external level conversion circuits, significantly simplifying on-site wiring.

Fixed frequency extension

EM-IO-04 expands the fixed frequency to 8 groups through parameter 131 (Fixed frequency change over 3):

Fixed frequency parameter FF3=0 FF3=1

Fixed frequency 5 485 0 1

Fixed frequency 6 486 1 1

Fixed frequency 7 487 1 0

Fixed frequency 8 488 0 1

CAN system bus configuration

The system bus interface of EM-IO-04 has optoelectronic isolation characteristics, enhancing its anti-interference ability in industrial electromagnetic environments.

7.1 Terminal resistor configuration (dip switch S1/S2)

Passive terminal (S1=ON, S2=OFF): Conventional terminal matching

Active terminal (S1=ON, S2=ON): Improve the shape of CAN signal edges

Factory default: S1 and S2 are both OFF

7.2 Node ID and Baud Rate

Parameter Description Range Factory Value

900 Node-ID-1~63-1 (disabled)

903 Baud-Rate 3~8 —

Set rules:

Node ID=-1: System bus disabled

Node ID=0: defined as the main station (only one is allowed)

Node ID=1~63: Slave address

7.3 Virtual Links

EM-IO-04 supports horizontal data transmission between frequency converters through TxPDO/RXPDO:

TxPDO channel Boolean parameter Word parameter Long parameter

TxPDO1 946~949 950~953 954~955

TxPDO2 956~959 960~963 964~965

TxPDO3 966~969 972~975 976~977

Digital signal state coding

The digital input/output status is read as decimal values through parameters 250 (Digital inputs) and 254 (Digital outputs) and needs to be converted to binary:

Position allocation:

Bit 3 (decimal 8): Digital port EM-S1IOD output status (when configured as output)

Bit 7 (decimal 128): Digital port EM-S1IOD input status (configured as input)

Bit 8 (256 decimal): Digital input EM-S2IND

Bit 9 (decimal 512): Digital input EM-S3IND

Quick Reference Table for Fault Codes

Fault code description and troubleshooting suggestions

F0400 motor temperature exceeding limit or temperature sensor connection fault inspection X410B. 1-2 wiring and sensor status

F1450 KTY temperature sensor measurement fault check whether S3 is on the left side (KTY mode) and whether the sensor resistance is within the effective range

F21nn system bus slave fault check corresponding node (nn hexadecimal)

F2200 SYNC message timeout check for main station SYNC generation

F2210 CAN bus BUS-OFF check for physical connections, terminal resistance, and baud rate

Bus load planning reference

Baud rate (kBaud) message transmission time (μ s)

1000 140

500 280

250 560

125 1120

100 1400

50 2800

Load assessment: A total load rate of ≤ 80% for all TxPDOs is normal, and>90% is unacceptable.