Danfoss VLT PTC Thermistor Card MCB 112 User manual

Operating Guide
VLT® PTC Thermistor Card MCB 112
VLT® HVAC Drive FC 102, VLT® AQUA Drive FC 202, VLT® Automation
Drive FC 302
vlt-drives.danfoss.com

1
1.1
1.2
1.3
1.4
1.5
1.5.1
1.5.1.1
1.5.2
1.5.3
1.5.4
1.5.5
1.5.6
1.5.7
1.5.8
1.6
1.6.1
1.6.2
1.6.3
1.7
1.7.1
1.7.2
2
2.1
2.2
2.3
2.4
2.5
3
3.1
3.2
3.3
3.4
3.5
3.6
Contents
Introduction 6
Purpose of this Operating Guide 6
Additional Resources 6
Version History 6
Products Covered 6
Functional Overview 6
Intended Use 6
Markings of the Drive 7
Foreseeable Misuse 7
Thermal Motor Protection 7
ATEX ETR Thermal Monitoring 7
Tripping Function 8
Safe Separation 8
Safe Disconnection Principle 8
Safe Disconnection Principle Diagram 8
Motor Requirements 9
Motor Limits and Rules 9
Additional Motor Requirements 9
Approvals and Certifications 9
Abbreviations and Conventions 9
Abbreviations 9
Conventions 10
Safety 11
Safety Symbols 11
Qualified Personnel 11
Responsibilities of Users of Safety-related Power Drive Systems PDS (SR) 11
Protective Measures 11
Safety Precautions 12
Installation 13
Safety Instructions 13
Installing the VLT® PTC Thermistor Card MCB 112 13
Sensor Circuit Wire Requirements 14
Connecting Sensor Circuit Wires 15
Maximum Current on MCB 112 16
Wiring of STO 16
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Contents
VLT® PTC Thermistor Card MCB 112
Operating Guide

3.7
4
4.1
4.2
4.2.1
4.2.2
4.2.3
4.3
4.3.1
4.4
4.4.1
4.4.2
4.4.3
4.4.4
4.4.5
4.4.6
4.4.7
4.4.8
4.4.9
5
5.1
5.2
6
6.1
6.2
6.2.1
6.2.2
6.2.3
6.2.4
6.2.5
6.2.6
6.2.7
6.2.8
6.2.9
7
7.1
Assembly 17
Commissioning 18
Commissioning the Drive 18
Operation and Maintenence 18
Testing 18
Monitoring Sensor Resistance 18
Thermal Limitation Curve (Ex eb and Ex ec Motors Only) 19
Parameter Set-up 20
Alarm Handling 20
Parameter Set-up for Ex eb and Ex ec Motors 20
Overview of Ex eb and Ex ec Specific Parameters 20
Activate the ATEX ETR Monitor Function 21
Maximum Current Limit 21
Minimum Motor Frequency 21
Maximum Motor Frequency 22
Minimum Switching Frequency 22
Disable Protection Mode 22
Safe Torque Off Functionality 22
Functions, Alarms, and Warnings 23
Application Examples 24
Setting up the Option for Standard Use 24
Combination with Other Components using STO 25
Maintenance and Troubleshooting 27
Maintenance 27
Troubleshooting 27
Test the Sensor Circuit and Relay Function 27
Alarm/Warning Code List 27
Description of Alarm Word, Warning Word, and Extended Status Word 27
Alarm 68, Safe Stop 27
Warning 68, Safe Stop 27
Alarm 71, PTC 1 Safe Stop 27
Warning 71, PTC 1 Safe Stop 28
Alarm 72, Dangerous Failure 28
Unexpected Combinations 28
Specifications 29
Mains Supply 29
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Contents
VLT® PTC Thermistor Card MCB 112
Operating Guide

7.2
7.2.1
7.2.2
7.2.3
7.3
7.3.1
7.3.2
7.4
7.5
Control Inputs and Outputs 29
PTC Thermistor Connection X44/1+X44/2 29
Safe Stop Terminal 37, X44/12 29
Logic out, X44/10 29
Ambient Conditions 29
Environment 29
Testing Conditions 29
Other Specifications 30
Safety Characteristics of the Built-in MCB 112 30
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Contents
VLT® PTC Thermistor Card MCB 112
Operating Guide

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1 Introduction
1.1 Purpose of this Operating Guide
This operating guide provides information for safe installation and commissioning of the VLT®PTC Thermistor Card MCB 112 used
with a Danfoss VLT®drive with Safe Torque Off (STO).
VLT®PTC Thermistor Card MCB 112 is also referred to as MS 220 DA.
This operating guide is intended for use by qualified personnel only. To use the drive safely and professionally, read and follow the
instructions, and pay particular attention to the safety instructions and general warnings. Keep this operating guide available with
the drive at all times.
VLT® is a registered trademark.
1.2 Additional Resources
This manual is targeted at users already familiar with the VLT®drives. It is intended as a supplement to the manuals and instructions
for download at http://drives.danfoss.com/downloads/portal/.
Read the instructions shipped with the drive and/or drive option before installing the unit, and observe the instructions for safe
installation.
1.3 Version History
This guide is regularly reviewed and updated. All suggestions for improvement are welcome.
The original language of this guide is English.
Table 1: Version History
Version
Remarks
MG33V302
Editorial changes. Now covering the complete system.
AQ267038105120, version 0101
Update for compliance to ATEX directive 2014/34/EU and actual standards.
1.4 Products Covered
The VLT®PTC Thermistor Card MCB 112 is available for the following drives:
VLT®HVAC Drive FC 102.
VLT®AQUA Drive FC 202.
VLT®AutomationDrive FC 302.
1.5 Functional Overview
1.5.1 Intended Use
The VLT®PTC Thermistor Card MCB 112 is intended to:
Protect electrical motors against inadmissible heating due to overload.
Protect explosion-protected motors in explosive atmospheres caused by:
gases, vapors, or mists, Zone 1 and Zone 2,
and/or in explosive atmospheres caused by dust, Zone 21 and Zone 22.
NOTICE
MARKINGS
Refer to marking G for Zone 1 and Zone 2. Refer to marking D for Zone 21 and Zone 22.
All functions in the MCB 112 serve to protect both non-explosive-protected motors and explosive-protected motors in regular oper-
ation and in case of failure.
The VLT®PTC Thermistor Card MCB 112 is designed in accordance with EN 60947-8 (VDE 0660 part 0302). Only connect PTC thermis-
tor sensors according to DIN VDE V 0898-1-401: 2020-03 (EN 60947-8).
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Introduction
VLT® PTC Thermistor Card MCB 112
Operating Guide

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NOTICE
BUILT-IN OPTION
The VLT®PTC Thermistor Card MCB 112 is only functional if it is built into the drive. The option cannot be used as a standalone.
1.5.1.1 Markings of the Drive
A sticker is delivered with the option as spare part or with the drive to signify ATEX certification. Apply this sticker to the front of the
drive in which the ATEX module is integrated. This sticker indicates that the drive is ATEX certified.
e30be103.12
Illustration 1: Label to Apply to Drive
1.5.2 Foreseeable Misuse
Any use not expressly approved by Danfoss constitues misuse. This also applies to failure to comply with the specified operating
conditions and applications.
Danfoss assumes no liability of any sort for damage attributable to improper use.
Only operate with explosion-protected 3-phase motors which are built, tested, and labeled separately for use with drives.
WARNING
EXPLOSION DANGER
Zone 0 and Zone 20 are not applicable to electrical motors. Using electrical motors in those zones can cause explosions.
Only use elecrical motors in:
Zone 1/21.
Zone 2/22.
1.5.3 Thermal Motor Protection
According to ATEX Directive 2014/34/EU and Standard EN 60079-14, motor overload protection is a requirement. The VLT®PTC
Thermistor Card MCB 112 monitors the temperature in the motor windings with an ATEX-approved motor overload protection de-
vice. If there is a critical temperature level or a malfunction, switch off the motor. If the drive is equipped with 3 or 6 PTC thermistors
in series according to DIN VDE V 0898-1-401: 2020-03, the MCB 112 offers ATEX-approved monitoring of the motor temperature.
Alternatively, an external ATEX-approved PTC protection device can be used.
1.5.4 ATEX ETR Thermal Monitoring
NOTICE
The ATEX ETR thermal monitoring function only applies to Ex eb and Ex ec motors. There is no need of ATEX ETR thermal moni-
toring for Ex db motors.
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Introduction
VLT® PTC Thermistor Card MCB 112
Operating Guide

FC 302 with firmware version V6.3x or higher, FC 102 with firmware version V4.40 or higher, and FC 202 with firmware version V2.63
or higher are equipped with an ATEX ETR thermal monitoring function for operation of Ex eb and Ex ec motors according to EN
60079-7. Combined with an ATEX-approved PTC monitoring device like the MCB 112, the installation does not need an individual
approval from an approbated organization, so there is no need for a specific matched-pairs approval.
The ETR Thermal Monitoring feature makes it easier to apply Ex eb and Ex ec motors instead of the more expensive, larger, and
heavier Ex db motors. The use of Ex eb and Ex ec motors is possible by ensuring that the drive limits the motor current to prevent
the motor from heating up.
1.5.5 Tripping Function
The VLT®PTC Thermistor Card MCB 112 includes a tripping stage for PTC thermistor sensors with safe potential separation of supply
voltage from ground. The tripping function switches off the +24 V DC directly at terminal 37 on the drive.
The PNP logic output terminal X44/10 signals the status in case of failure. The MCB 112 works according to the closed-circuit princi-
ple. The device trips in case of short circuit or line interruption.
1.5.6 Safe Separation
The PTC thermistor circuit (T1, T2) has a safe separation of low-voltage electric circuits (PELV, see 3.4 Connecting Sensor Circuit
Wires.
1.5.7 Safe Disconnection Principle
The Safe Torque Off function disables the control voltage of the power semicondictors or the drive output stage. Disabling the con-
trol voltage prevents the inverter from generating the voltage required to rotate the motor.
1.5.8 Safe Disconnection Principle Diagram
Drive
Logic
out
Control card
Potentially explosive
atmosphere
PTC-sensors
3~Ex-Motor
Safe channel
T37
Safe stop
T37
T1
TP TP
T2
+24 V
PTC Thermistor Card
MCB 112
Non-explosive hazard zone
91
92
93
96
97
98
Converter module
e30be102.11
DI
Illustration 2: Block Diagram of Safe Disconnect with MCB 112
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Introduction
VLT® PTC Thermistor Card MCB 112
Operating Guide

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1.6 Motor Requirements
1.6.1 Motor Limits and Rules
For every certified motor with increased safety, the manufacturer supplies a data list including limits and rules. During planning,
installation, commissioning, operation, and service, respect the limits for:
Minimum switching frequency.
Maximum current.
Minimum motor frequency.
Maximum motor frequency.
Furthermore, respect the following:
Do not exceed the maximum allowable ratio between drive size and motor size. The typical value is IVLT,n≤2 x Im,n.
Consider all voltage drops from the drive to the motor. If the motor is running with lower voltage than listed in the U/f charac-
teristics, current might increase and cause an alarm.
Multi-motor applications are not allowed. Only connect 1 motor to the drive.
1.6.2 Additional Motor Requirements
The Ex eb motor must be approved for operation in hazardous zones (ATEX Zone 1/21, ATEX Zone 2/22) in combination with drives.
The motor must be certified for the particular hazardous zone.
The Ex ec motor must be approved for operation in hazardous zones (ATEX Zone 2/22) in combination with drives. The motor must
be certified for the particular hazardous zone.
NOTICE
The motor can be placed in Zone 1/21 or 2/22 according to motor approval. The drive must always be installed outside of the
hazardous zone.
Only operate explosion-protected 3-phase motors with drives if the motors are built, tested, approved, and labeled separately
for this mode.
When the usage of the motor and its thermal protective device are approved for drive operation, use the VLT®PTC Thermistor
Card MCB 112 for each ignition protection system for all motor types. For motors of Ex eb and Ex ec ignition protection, which
are OEM-approved for drive operation in Ex-hazardous areas, consider and use the requested limitations in the drive's ATEX ETR
thermal monitoring settings.
The necessary parameters and conditions are on the nameplate and in the documentation of the motor. To prevent prohibited
temperatures, the motors are equipped as standard with thermal winding protection, which has to be evaluated by a suitable
device like MCB 112. The motors must not be operated as a group drive.
1.6.3 Approvals and Certifications
Certification number: PTB 14 ATEX 3009
Certificates and declarations of conformity are available. Contact a local Danfoss partner.
1.7 Abbreviations and Conventions
1.7.1 Abbreviations
Abbreviation
Description
ETR
Electronic thermal relay
LCP
Local control panel
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Introduction
VLT® PTC Thermistor Card MCB 112
Operating Guide

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Abbreviation
Description
NC
Not connected
PNP
Positive negative positive (transistor)
TNF
Nominal response temperature
Abbreviation
Reference
Description
ATEX
ATEX Directive 2014/34/EU
ATmosphere EXplosibles.
HFT
EN IEC 61508
Hardware fault tolerance: HFT=n means that n+1 faults could cause a loss of the
safety function.
PDS/SR
EN IEC 61800-5-2
Power drive system (safety-related).
PFD
EN IEC 61508
Average probability of failure on demand, value used for low-demand operation.
SFF
EN IEC 61508
Safe failure fraction [%]; percentage of safe failures and dangerous detected fail-
ures of a safety function or a subsystem related to all failures.
SIL
EN IEC 61508, EN IEC 62061
Safety integrity level.
STO
EN IEC 61800-5-2
Safe Torque Off
SRECS
EN IEC 62061
Safety-related electrical control system.
1.7.2 Conventions
Numbered lists indicate procedures.
Bulleted and dashed lists indicate listings of other information where the order of the information is not relevant.
Bolded text indicates highlighting and section headings.
Italicized text indicates the following:
Cross-reference.
Link.
Footnote.
Parameter name.
Parameter option.
Parameter group name.
All dimensions in drawings are in metric values (imperial values in brackets).
An asterisk (*) indicates the default setting of a parameter.
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Introduction
VLT® PTC Thermistor Card MCB 112
Operating Guide

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1.
2.
3.
2 Safety
2.1 Safety Symbols
The following symbols are used in this manual:
DANGER
Indicates a hazardous situation which, if not avoided, will result in death or serious injury.
WARNING
Indicates a hazardous situation which, if not avoided, could result in death or serious injury.
CAUTION
Indicates a hazardous situation which, if not avoided, could result in minor or moderate injury.
NOTICE
Indicates a property damage message.
2.2 Qualified Personnel
The products must only be assembled, installed, programmed, commissioned, maintained, and decommissioned by persons with
proven skills. Persons with proven skills:
Are qualified electrical engineers, or persons who have received training from qualified electrical engineers and are suitably
experienced to operatre devices, systems, plant, and machinery in accordance with the general standards and guidelines for
safety technology.
Are familiar with the basic regulations concerning health and safety/accident prevention.
Have read and understood the safety guidelines given in this manual and also the instructions given in the operating guide of
the drive.
Have good knowledge of the generic and specialist standards applicable to the specific application.
2.3 Responsibilities of Users of Safety-related Power Drive Systems PDS (SR)
Users of safety-related Power Drive Systems (PDS (SR)) are responsible for:
Carry out a hazard and risk analysis of the application according to EN ISO 12100.
Ensure that the qualified personnel have experience with working in ATEX areas according to Directive 99/92/EC (also known as
the ATEX Workplace Directive).
Identify safety functions required, and allocate SIL or PLr to each of the functions.
Identify other subsystems and validate the signals and commands from those subsystems.
Design appropriate safety-related control systems (hardware, software, parameterization, and more).
2.4 Protective Measures
Qualified and skilled personnel must be available for installing and commissioning the safety engineering systems.
Procedure
Install the drive in an IP54 cabinet as per IEC 60529, or in an equivalent environment. In special applications, a higher IP
rating may be necessary.
Ensure short-circuit protection of the cable between terminal 37 and the external safety device according to ISO 13849-2
table D.4.
Optional step: Install additional measures (for example, a safety holding brake) if external forces influence the motor axis
(for example, suspended loads).
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Safety
VLT® PTC Thermistor Card MCB 112
Operating Guide

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2.5 Safety Precautions
WARNING
EXPLOSION HAZARD
Using the VLT®PTC Thermistor Card MCB 112 in areas with explosive gas and/or dust atmospheres may lead to death, personal
injury, or property damage. To avoid the risk, adhere to the following:
Always provide the MCB 112 with a pressurized enclosure according to EN 60079-1 (Explosive atmospheres - Part 1: Equip-
ment protection by flameproof enclosures "d").
Observe national safety rules and regulations for prevention of accidents, as well as the European Standard EN 60079-14
(Explosive atmospheres - Part 14: Electrical installations design, selection, and erection).
Only qualified personnel is allowed to install, connect, and commission the MCB 112.
Ensure that the motor thermal protection switches off the motor directly, via the Safe Torque Off (STO) function, and/or by
using the ATEX ETR thermal monitoring function.
WARNING
FIRE HAZARD
Using the VLT®PTC Thermistor Card MCB 112 in areas with combustible dust may lead to death, personal injury, or property dam-
age. To avoid the risk, adhere to the following:
Always provide the MCB 112 with a dust-proof enclosure according to IEC 60529.
Observe national safety rules and regulations for prevention of accidents, as well as the European Standard EN 60079-14
(Explosive atmospheres - Part 14: Electrical installations, design, selection, and erection).
Only qualified personnel is allowed to install, connect, and commission the MCB 112.
For more information on qualified personnel, see 2.2 Qualified Personnel.
WARNING
UNINTENDED START
When the drive is connected to AC mains, DC supply, or load sharing, the motor may start at any time, causing risk of death,
serious injury, and equipment or property damage. The motor may start by activation of an external switch, a fieldbus command,
an input reference signal from the LCP or LOP, via remote operation using MCT 10 setup software, after a cleared fault condition,
or after the motor and motor thermistors have cooled down.
Press [Off] on the LCP before programming parameters.
Disconnect the drive from the mains whenever personal safety considerations make it necessary to avoid unintended motor
start.
Check that the drive, motor, and any driven equipment are in operational readiness.
CAUTION
RISK OF INJURY AND EQUIPMENT DAMAGE
Read and observe this operating guide and the safety warnings before installing the VLT®PTC Thermistor Card MCB 112. Not
adhering to the instructions and warnings in this manual may lead to personal injury, property and equipment damage.
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Safety
VLT® PTC Thermistor Card MCB 112
Operating Guide

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2.
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3 Installation
3.1 Safety Instructions
See chapter Safety for general safety instructions. Also, always observe the relevant drive operating guide and the instructions pro-
vided by the motor manufacturer.
3.2 Installing the VLT® PTC Thermistor Card MCB 112
WARNING
DISCHARGE TIME
The drive contains DC-link capacitors, which can remain charged even when the drive is not powered. High voltage can be
present even when the warning indicator lights are off.
Failure to wait the specified time after power has been removed before performing service or repair work could result in death or
serious injury.
Stop the motor.
Disconnect AC mains, permanent magnet type motors, and remote DC-link supplies, including battery back-ups, UPS, and
DC-link connections to other drives.
Wait for the capacitors to discharge fully before performing any service or repair work. The discharge time is printed on the
type label of the drive and also specified in the Discharge time tables in the FC 102/202/302 Operating Guides.
Use a measuring device to make sure that there is no voltage, before opening the drive or performing any work on the ca-
bles.
CAUTION
Place the drive with VLT®PTC Thermistor Card MCB 112 (including the connection between output safe stop T37 output (X44/12)
on MCB 112 and terminal 37 input on the control card) in an IP54 enclosure as per IEC 60529.
CAUTION
RISK OF OVERVOLTAGE
Long cables (voltage peaks) or increased mains voltage may lead to overvoltage at the motor terminals and damage the equip-
ment.
Install a sine-wave filter.
NOTICE
For motor connection, AC mains connection, and control wiring, follow the instructions for safe installation in the drive operating
guide and in the VLT®Frequency Converter - Safe Torque Off Operating Guide.
Procedure
Disconnect power to the drive.
Remove the LCP, the terminal cover, and the LCP frame from the drive.
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VLT® PTC Thermistor Card MCB 112
Operating Guide

3.
-
Fit the MCB 112 in slot B, see Illustration 3.
e130be118.11
A
B
D
Illustration 3: LCP Frame and Terminal Cover Removal
3.3 Sensor Circuit Wire Requirements
WARNING
NO SAFE FUNCTION
Using sensor wires with a resistance >20 Ω causes the safe function not to work.
To ensure a properly working safe function, only use sensor circuit wires with a resistance <20 Ω.
Wire cross-section [mm2(AWG)]
Wire length [m (ft)]
1.5 (16)
2x800 (2x2625)
1 (17)
2x500 (2x1640)
0.75 (18)
2x300 (2x984)
0.5 (20)
2x250 (2x820)
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VLT® PTC Thermistor Card MCB 112
Operating Guide

1.
2.
3.
4.
5.
3.4 Connecting Sensor Circuit Wires
NOTICE
The connections are not pre-wired from factory.
NOTICE
Route the sensor circuit wires as separate control wires. It is not allowed to use wires from the supply cable or any other mains
cables. Use shielded control wires. See 3.5 Maximum Current on MCB 112 for correct wiring.
Connect the sensor circuit wires for the VLT®PTC Thermistor Card MCB 112 as follows:
Procedure
Select the appropriate sensor wires.
Route the sensor wires.
Remove the shielding in the area of the shielding clamps.
e30bt340.12
1
2
Illustration 4: Connecting Shielded Wire
1
Shielding clamps
2
Removed shielding
Measure the sensor resistance.
Connect the sensor circuit wires to X44/T1 and T2, see 3.4 Connecting Sensor Circuit Wires.
NOTICE
Only check PTCs with measuring voltages of <2.5 V.
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Installation
VLT® PTC Thermistor Card MCB 112
Operating Guide

6.
1.
At commissioning and after modification of the plant, check the sensor resistance with a suitable measuring instrument. If
the resistance between terminals 1 and 2 is <50 Ω, examine the sensor circuit for a short circuit.
3.5 Maximum Current on MCB 112
PTC
M 3~
TP TP
12 13 18 19 27 29 32 33 20 37
e30bb161.14
12030-1202-01
X44
www.ziehl.de
T1
1
T2
2
NC
3
NC
4
NC
5
NC
6
NC
7
NC
8
NC
9
NC
11
T37
12
OUT
10
LOGIC SAFE STOP
0102
Motor protection
10
12
20-28 VDC
20-28 VDC
10 mA
60 mA
PTC
ZIEHL industrie-elektronik GmbH + Co KG
Daimlerstrasse 13, 74523 Schwäbisch Hall
MCB 112 PTC
Code No. 130B1137
SEE
MANUAL
FOR
ADDITIONAL INSTRUCTIONS
PTB 14 ATEX 3012U
II (2) G [Ex eb Gb] [Ex db Gb]
II (2) D [Ex tb Db]
!
Thermistor Option B
Illustration 5: Wiring Diagram
T10
10 mA
T12
60 mA
Terminal 12
24 V DC supply voltage
Terminal 13
24 V DC supply voltage
T37 (X44/12)
Output terminal on the VLT®PTC Thermistor Card MCB 112 option.
Terminal 37
Input terminal on the control card.
X44/10
Logic output signals the status in case of failure.
3.6 Wiring of STO
Procedure
Remove the jumper wire between control terminals 37 and 12, or 13.
Cutting or breaking the jumper is not sufficient to avoid short circuiting.
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VLT® PTC Thermistor Card MCB 112
Operating Guide

2.
3.
1.
2.
3.
4.
5.
6.
12/13
37
e130be099.11
Connect X44/12 on the option to terminal 37 on the drive.
Connect terminal X44/10 to a digital input of the drive. For reference when programming, note the number of selected
digital input.
3.7 Assembly
Procedure
Remove the knock-out in the extended LCP frame, so that the option fits under the extended LCP frame.
Fit the extended LCP frame and terminal cover.
Fit the LCP or blind cover in the extended LCP frame.
To indicate that the ATEX module is integrated, apply the delivered sticker to the front of the drive, see 1.5.1.1 Markings of
the Drive.
Connect power to the drive.
Perform risk assessment and a commissioning test according to EN ISO 12100.
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1.
-a.
-b.
-c.
-d.
-e.
2.
-a.
-b.
-c.
4 Commissioning
4.1 Commissioning the Drive
Procedure
For commissioning the STO, follow the instructions in the section Commissioning of the VLT®Frequency Converters Safe
Torque Off Operating Guide.
Read and understand the safety instructions.
Activate the STO.
Set the parameters (automatic or manual restart).
Perform STO commissioning test.
Ensure system configuration security.
Test the correct function of the MCB 112 by simulation of the sensor resistance at terminals T1 and T2. This test must also
be done at maintenance services.
Perform a short-circuit test: Resistance 20 Ω in parallel to sensor terminals T1 and T2.
Perform a line interruption test: Disconnect sensor line at terminal T1 or T2.
Perform a temperature test: Increase resistance 50–1500 Ω to 4000 Ω. The tripping function is stated in the LCP and
can be reset manually when the failure is removed. The output states of X44/12 and X44/10 shall be as shown in
the illustration in 4.2.2 Monitoring Sensor Resistance. Pay attention to the ambient conditions, see chapter Specifi-
cations.
4.2 Operation and Maintenence
4.2.1 Testing
The safety function must be tested with regular intervals.
Test once per year, or within the maintenance cycle of the plant.
For recurring examinations of electrical systems in hazardous areas, the inspection period must be kept within 3 years. The safety
test recognizes 1 fault (1oo1 - 1 out of 1). One fault between safety tests can cause loss of protection.
4.2.2 Monitoring Sensor Resistance
!
1)
2)
+24 V
0 V
3650 Ω
High=1
X44/12 Low=0
High=1
X44/10 Low=0
1500 Ω
T1/T2
e30bb163.10
Illustration 6: Monitoring of Sensor Resistance
1
Short circuit
2
Tripping is not saved and is not protected against 0 voltage
A current continuously monitors the resistance of the sensors. In cold state, the resistance is <250 Ω per sensor (sensor circuit
<1.5 kΩ). The output to terminal X44/12 is high=1. The resistance of the sensor rises rapidly at nominal response temperature TNF.
At a resistance of 3–4 kΩ, output to terminal X44/12 changes to low=0. The devices also switch off if the sensor wire short-circuits
(<20 Ω, or if the sensor or wire is interrupted. It switches back on automatically when the temperature has decreased by approxi-
mately 5 °C (41 °F).
Depending on the number of sensors, the following tripping and release temperatures are achieved with respect to TNF (nominal
response temperature of the sensors).
AQ267038105120en-000101 / 130R010418 | Danfoss A/S © 2022.08
Commissioning
VLT® PTC Thermistor Card MCB 112
Operating Guide

1.
-
Trip temperatures
Release temperatures
3 sensors in series
TNF+5 K
TNF-5 K
6 sensors in series
TNF
TNF-20 K
4.2.3 Thermal Limitation Curve (Ex eb and Ex ec Motors Only)
WARNING
EXPLOSION DANGER
Always use the thermal limitation curve in combination with Ex eb and Ex ec motors. See Illustration 8.
The output current/motor speed is permanently monitored and limited depending on the characteristic given by the motor manu-
facturer on the motor nameplate data and data sheets.
e30bd888.11
CONVERTER SUPPLY
VALID FOR 380 - 415V FWP 50Hz
3 ~ Motor
MIN. SWITCHING FREQ. FOR PWM CONV. 3kHz
l = 1.5XIM,N tOL = 10s tCOOL = 10min
MIN. FREQ. 5Hz MAX. FREQ. 85 Hz
PWM-CONTROL
f [Hz]
Ix/IM,N
PTC °C DIN VDE V 0898-1-401
Manufacture xx EN 60079-0
EN 60079-7
СЄ 1180 Ex-e ll T3
5 15 25 50 85
0.4 0.8 1.0 1.0 0.95
1
xЗ
2
3
4
Illustration 7: Motor Nameplate Showing Drive Requirements
1
Minimum switching frequency
2
Maximum current
3
Minimum motor frequency
4
Maximum motor frequency
Procedure
Program the characteristic values as frequency/current pairs in parameters 1-98 ATEX ETR interpol. points freq. and 1-99 ATEX
ETR interpol points current.
5 Hz 15 Hz 25 Hz 50 Hz
e130bb909.11
100%
80%
40%
Illustration 8: Example of ATEX ETR Thermal Limitation Curve
AQ267038105120en-000101 / 130R0104 | 19Danfoss A/S © 2022.08
Commissioning
VLT® PTC Thermistor Card MCB 112
Operating Guide

2.
3.
4.
5.
Parameter 1-98
Parameter 1-99
[0]=5 Hz
[0]=40%
[1]=15 Hz
[1]=80%
[2]=25 Hz
[2]=100%
[3]=50 Hz
[3]=100%
Use the 4 current points [A] from the motor nameplate.
Calculate the values as a percentage of nominal motor current and enter it into the array.
Ixx100
Im,n%
Program all frequency/current limit points from the motor nameplate or motor data sheet.
Enter frequency settings for parameter 1-98 ATEX ETR interpol. points freq. in Hz, not RPM.
4.3 Parameter Set-up
4.3.1 Alarm Handling
NOTICE
Ensure that the digital input set to [80] PTC Card 1 is not also connected as a thermistor resource (motor overload protection) in
parameter 1-93 Thermistor Resource.
Configure the digital input in parameter group 5-1* Digital Inputs.
Digital input function
Select
Terminal
No operation
[0]
All terminals 32, 33
Reset
[1]
All
...
PTC Card 1
[80]
All
...
All digital inputs can be set to [80] PTC Card 1. However, only 1 digital input can have this selection.
4.4 Parameter Set-up for Ex eb and Ex ec Motors
NOTICE
Do not use the ATEX ETR Monitor function with an Ex db motor by setting Parameter 1–90 Motor Thermal Protection to a different
value than [20] ATEX ETR. This automatically disables the ATEX ETR specific parameters from parameter 1–94 ATEX ETR cur.lim.
speed reduction to parameter 1-99 ATEX ETR interpol points current.
4.4.1 Overview of Ex eb and Ex ec Specific Parameters
Parameter
Setting
Parameter 1–90 Motor Thermal Protection
[20] ATEX ETR
Parameter 1–94 ATEX ETR cur.lim. speed reduction
20%
Parameter 1–98 ATEX ETR interpol. points freq.
Motor nameplate
AQ267038105120en-000101 / 130R010420 | Danfoss A/S © 2022.08
Commissioning
VLT® PTC Thermistor Card MCB 112
Operating Guide