ZIEHL-ABEGG U-EK230E User manual

Operating Instructions english
Type U-EK230E Part.-No. 382008
Releasing unit for motors with temperature sensors "TP" (thermistors)
U-EK230E
L-BAL-E185-GB 2023/10 Index 005
11660-0711-03
0102
8507
marking see type plate on the device –
EU type examination certificate PTB 03 ATEX 3045
Issue 1
UK type examination certificate EPS 23 UKEX 1011
Table of contents
1 General Notes......................................................................................................................................2
2 Display- and control elements............................................................................................................2
3 Pre-Adjustment....................................................................................................................................2
4 Application and brief description.......................................................................................................3
5 Summary of features...........................................................................................................................3
6 Connecting diagram............................................................................................................................3
7 Function diagram ................................................................................................................................4
8 Important notes ...................................................................................................................................4
9 Installation ...........................................................................................................................................4
10 Commissioning..................................................................................................................................5
11 Operation instructions......................................................................................................................5
12 Troubleshooting and remedies ........................................................................................................5
13 Technical data ...................................................................................................................................5
14 Dimensions - Design V2....................................................................................................................7
15 Safety instructions and references for putting into operation.......................................................7
16 Proof testing of the safety functions................................................................................................9
17 Maintenance and repair...................................................................................................................10
18 Disposal / Recycling........................................................................................................................10
19 Manufacturer reference...................................................................................................................10
20 Service information.........................................................................................................................10
21 EU-Declaration of conformity.........................................................................................................11
22 UKCA-Declaration of Conformity ...................................................................................................12

U-EK230E
L-BAL-E185-GB 2023/10 Index 005
11660-0711-03
2/12
1 General Notes
Compliance with the following instructions is mandatory to ensure the functionality and safety of the
product. If the following instructions given especially but not limited for general safety, transport,
storage, mounting, operating conditions, start-up, maintenance, repair, cleaning and disposal /
recycling are not observed, the product may not operate safely and may cause a hazard to the life and
limb of users and third parties.
Deviations from the following requirements may therefore lead both to the loss of the statutory material
defect liability rights and to the liability of the buyer for the product that has become unsafe due to the
deviation from the specifications.
2 Display- and control elements
1. Alarm (red)
2. ON (green)
3. Reset button (blue)
3 Pre-Adjustment
No settings have to be made. The tripping temperature is determined solely by the response
temperature of the connected thermistors.
Depending on the number of thermistors the following tripping temperatures and reset temperatures
arise related to TNF (detector operating temperature):
Only 3 or 6 thermistors in series are allowed for usage in explosive atmospheres.
Tripping temperature
Reset temperature
1 thermistor
TNF + 15 K
TNF + 5 K
3 thermistors in series
TNF + 5 K
TNF –5 K
6 thermistors in series
TNF
TNF –20 K

U-EK230E
L-BAL-E185-GB 2023/10 Index 005
11660-0711-03
3/12
4 Application and brief description
The device protects electrical equipment against excessive warming and thermal overload. Used in
combination with respective thermistors tripping temperatures from 60 °C up to 180 °C can be realized.
The device is conform to EN 60947-8. Thermistors according to DIN VDE V 0898-1-401 (ATEX) or
equivalent detail specification (UKEX) shall be connected. The thermistors are suitable for installation
into windings of electrical machines or transformers, bearings and heatsinks as well as to monitor the
temperature of liquid media, airflow and gases. With ATEX approval, equipment in explosive gas
atmospheres Zone 1 and 2 (marking G: gas) or in areas with combustible dust Zone 21 and 22 (marking
D: dust) can be protected. All functions of the device serve to protect non-explosive-protected equipment
and explosive-protected equipment in regular operation and in case of failure.
5 Summary of features
•1 thermistor circuit for 1 (not allowed for explosive atmospheres), 3 or 6 PTC thermistors “TP”.
•Short-circuit detection within the thermistor circuit.
•Output relay with 1 change-over contact (co).
•Operating status display.
A current monitors continuously the resistance of the thermistor circuit. In cold state, the resistance is
≤ 250 Ω per thermistor (thermistor circuit ≤1.5 kΩ). The device is switched on and relay contacts 11, 14
are closed. The resistance of the thermistors rises rapidly at detector operating temperature TNF. The
device switches off at a resistance of 3…4 kΩ and the relay contacts 11, 12 close. The device also
switches off in the case of detector or line short-circuit (< approx. 20 Ω) or detector or line interruption.
The device remains switched off until the build in or an external reset button is pushed. Power-on is
recognized as reset. With bridged terminals Y1, Y2, the reclosing lock function is disabled.
6 Connecting diagram
Us
Supply voltage
S1
Off switch
1) external interlock,
see chapter 15.11
Manual reset
TP
PTC thermistor
S2
Push button on
(manual reset)
F1 –F4
Fuses
S3
Remote reset
H1
Indicator lamp fault
K1
Contactor

U-EK230E
L-BAL-E185-GB 2023/10 Index 005
11660-0711-03
4/12
7 Function diagram
Caution! The device switches on automatically after a supply voltage dip.
Inputs (Y1/Y2) bridged
With a bridge at the reset input (Y1/Y2) the reclosing lock is out of operation. The
device switches back automatically, when the temperature of the thermistor
circuit has fallen below the switchback value.
8 Important notes
Attention!
Observe safety rules and standards. Notice safety remarks!
Attention!
Hazardous voltage!
May cause electric shock and burns.
Before commencing work on the system, the power must be disconnected.
9 Installation
•The applicant must observe safety rules and standards.
•The device can be mounted on 35 mm rail according EN 60715 or with screws M4 (Option).
•Design V2, width 35 mm (2 M).
•The device must be installed in an enclosure of class IP 5X or better.
•Terminals maximum tightening torque 0.5 Nm.
When installing the device into the switchgear cabinet, please observe the max. permissible
temperature. Care for both, sufficient clearance to other devices or sources of heat or enough
forced draught. If cooling is made more difficult, e.g. close devices with increased surface
temperature or by handicap of airflow cooling, the permissible ambient temperature reduces.

U-EK230E
L-BAL-E185-GB 2023/10 Index 005
11660-0711-03
5/12
10 Commissioning
Before switching on the mains voltage make sure that it matches the
specification on the type plate.
Attention!
Observe chapter 15.8 Safe separation.
•After the supply voltage is switched on and when the thermistors are correctly connected the green
LED „ON“ must light-up and the relay contacts 11, 14 must close.
•The correct function of the device must be checked by resistance simulation at terminals T1, T2
according to chapter 16 Proof testing of the safety functions. This check must be repeated after
changes to the installation.
11 Operation instructions
The device must be manually reset after a fault signal (red = alarm). For this purpose, the built-in reset
button or an external button (remote reset terminals Y1, Y2) can be used.
12 Troubleshooting and remedies
Relay contacts 11, 14 do not close:
•Check the supply voltage Us at terminals A1, A2 (green LED lights-up).
•Check the thermistors at terminals T1, T2. In case of a fault the red LED lights-up.
•The resistance of the thermistor circuit must be 50 Ω < R < 1500 Ω. The terminal voltage T1, T2 must
be < 2.5 VDC with connected thermistors and temperature below TNF.
•Push the button “Reset”. A fault signal can be reset at R < 1.65 kΩ. The status LED changes from
red to green. Alternatively, a reset can be done with closing an external contact at terminals Y1, Y2
or with voltage recovery.
Relay contacts 11, 14 do not open:
•With no connection at terminals T1, T2 the device must indicate a fault and the relay contacts 11, 14
must open. The terminal voltage T1, T2 must be approximately 8 VDC.
In case of any other malfunctions, replace the device. Please add a description of the occurred
malfunction when sending it back for repair.
13 Technical data
Power supply (A1, A2)
Power supply Us
AC 220-240 V
Voltage tolerance
AC 0.9 Us …1.1 Us
Frequency
50 / 60 Hz
Frequency tolerance
45 Hz … 65 Hz
Power consumption
< 2 W
Voltage dip buffer time
max. 20 ms
PTC thermistor “TP” input (T1, T2)
according to DIN VDE V 0898-1-401
Number
1 (not allowed for explosive atmospheres) 3 or 6 in series
Rated response temperature TFS
60 °C … 180 °C
Response tolerance
±6 °C
Collective resistance cold thermistor
≤ 1.65 kΩ
Terminal voltage (thermistor)
≤ 2.5 VDC at R ≤ 3.65 kΩ, ≤ 2 V at R ≤ 1.65 kΩ
Open-circuit voltage
≤ 9 VDC at R = 
Terminal current (thermistor)
≤ 1 mA

U-EK230E
L-BAL-E185-GB 2023/10 Index 005
11660-0711-03
6/12
Power / Load
≤ 2 mW
Line capacity max.
0.2 µF
Temperature monitor cut-out-point
3.3 kΩ …3.65 kΩ …3.85 kΩ
Temperature monitor reclosing point
1.7 kΩ …1.8 kΩ …1.95 kΩ
Short circuit monitor cut-out-point
≤ 20 Ω
Short circuit monitor reclosing point
≤ 40 Ω
Reset input (Y1, Y2)
Potential free contact (no)
Current
1 mA
Voltage
< 30 VDC
Relay output (11, 12, 14)
EN 60947-5-1
Contacts
1 change-over contact (co)
Switching voltage
max. AC 400 V
Switch-on current (NO)
AC 15 A 4s 10% ED
min. voltage / current
12 V 10 mA
Conventional thermal current Ith
max. 5 A
Switching power max. AC cos φ = 1
2000 VA
Switching power max. DC (ohm)
0.25 A 300 V; 0.35 A 150 V; 1 A 60 V; 8 A 30 V
Contact life electrical cos φ = 1
2 x 105operating cycles at 250 V / 2 A
1 x 105operating cycles at 250 V / 5 A
Contact life mechanical
3 x 107operating cycles
Recommended fuse (NO)
4 A time-lag or miniature circuit-breaker MCB B4
Recommended fuse (NC)
3.15 A time-lag
Utilization category
Rated operational current
Rated operational voltage
AC-15 Ie = 3 A Ue = 250 V
DC-13 Ie = 2 A Ue = 24 V
DC-13 Ie = 0.4 A Ue = 120 V
DC-13 Ie = 0.2 A Ue = 250 V
UL electrical ratings
250 VAC, 3 A, general use
C300
Test conditions
IEC/EN 60947-8
Rated impulse voltage
4000 V
Overvoltage category
III
Pollution degree
2
Rated insulation voltage Ui
320 V
Transformer
EN 61558-2-6 (VDE 0570)
Proof Test Voltage
2500 VAC 50 Hz
EMC - Immunity
EN 61000-6-2
EMC - Emission
N.a., fmainosc < 9 kHz
On-period
100 %
Ambient conditions
Fitting position
any
Rated ambient temperature
-20 °C ... +55 °C
Rated storage Temperature
-20 °C …+70 °C (1K21 EN 60721-3-1)
Altitude
≤ 2000 m above sea level.
Climatic conditions
5-85 % rel. F., no condensation (3K22 EN60721-3-3)
Vibration DIN EN 60068-2-6
2…25 Hz ±1.6 mm 25 ... 150 Hz 5 g
Vibration DIN EN 60947-8
2 … 13.2 Hz ± 1 mm 13.2 ... 100 Hz ± 0.7 g
Shock DIN EN 60947-8
half sine, 10 g, 11 ms
Housing
Design V2
Dimensions (W x H x D) mm
35 x 90 x 58 mm
Width
2 M
Plastic material
PA66
Fire protection class
UL 94 V-2
Protection class housing EN 60529
IP30
Mounting EN 60715
Snap mounting on 35 mm standard rail EN60715
Optional: Screw mounting
M4 screws (additional bar not included)
Weight
approx. 117 g
Terminal connection
Screw mounting M3
Protection class terminals EN 60529
IP20
Tightening torque
0.5 Nm

U-EK230E
L-BAL-E185-GB 2023/10 Index 005
11660-0711-03
7/12
Line connection solid wire
1 x 0.5 ... 2.5 mm2(AWG 22 - 14)
Stranded wire with insulated ferrules
1 x 0.14 …1.5 mm2(AWG 28 - 16)
Insulation strip length min
8 mm
Subject to technical modifications
14 Dimensions - Design V2
Dimensions in mm
1) Top piece
2) Bottom piece
3) Mounting bar
4) Seal mounting link
5) Front plate element
6) Marking for bottom
7) Extensible bolt for wall
fastening with screws. Bolt
bore Ø 4.2 mm
15 Safety instructions and references for putting into operation
Attention!
Safety Instructions and references
please read carefully!
15.1 Explosive atmospheres
•The increased danger within explosive atmospheres (gas or dust) requires the careful attention of the
safety instructions and references for putting into operation. Observe the national safety rules and
regulations for prevention of accidents as well as the standard EN 60079-14 / VDE 0165-1. All work
for the connection, for putting into operation and maintenance is to be implemented by qualified,
responsible technical personnel. Inappropriate behaviour can cause heavy personal damage and
damages to property.
•The response of the device must directly switch off the motor, also when used together with
inverters. This must be implemented with circuitry.
15.2 Special remarks for explosive gas atmospheres areas (Zone 0, 1 and 2)
•The device must be installed outside potentially explosive gas atmospheres unless the device is
protected by a suitable ignition protection type (for example a flameproof enclosure).
15.3 Special remarks for use in the presence of combustible dust (Zone 20, 21 and 22)
•The device must be installed outside potentially explosive dust atmospheres unless the device is
protected by a suitable enclosure for dust atmospheres.
48
58
45
3
61,8
16,5
(90)
Option
98
116
35
3
4
12
5
7
6

U-EK230E
L-BAL-E185-GB 2023/10 Index 005
11660-0711-03
8/12
15.4 Safety characteristics of the safety device (EN 50495 / VDE 0170-18)
Safety Integrity Level (EN 61508) and safety related parameters
Operating mode
Hardware architecture
HFT
Safety Integrity Level
low demand mode
1oo1
0
SIL 1
Type
MTBF
PFH
SFF
SD
SU
DD
DU
U-EK230E
52 years
4.26E-07
55 %
4.52E-07
6.10E-08
0
4.26E-07
Type
Proof test
interval T1
1year
3 years
5 years
10 years
U-EK230E
PFDavg
1.87E-03
5.60E-03
9.33E-02
1.87E-02
Observe proof test interval according EN 60079-17 for electrical equipment ≤ 3 years.
15.5 Category and Performance-Level (EN ISO 13849-1)
The device fulfils the requirements of category 1 and PL = c. MTTFd= 100 years.
The data of the functional safety stated above are valid for an ambient temperature of 40 °C. Data for
additional ambient temperatures can be obtained on request.
15.6 Application of the safety device used with equipment category (EN 50495 / VDE 0170-18)
This standard describes the minimum requirements of safety integrity level and fault tolerance of a safety
device in the application together with the category of the Equipment Ander Control (EUC).
EUC
Safety device
no safety device
SIL 1
SIL 2
Category 2
(2G, 2D) EPL = Gb, Db
Zone 1, Zone 21
Zone 0, Zone 20
Zone 0, Zone 20
Category 3
(3G, 3D) EPL = Gc, Dc
Zone 2, Zone 22
Zone 1, Zone 21
Zone 0, Zone 20
The device thus is suitable as safety device for Equipment Under Control (EUC) with HFT = 0 category 3
in Zone 1 and Zone 21. The combined equipment shall comply with the relevant standards EN 60079-0
according to the categories to match.
15.7 Wiring
•The lines of the thermistor circuit must be routed as separate control lines as far as to the motor
terminal block. Using lines of the supply cable or other mains voltage lines is not permissible. If
extreme inductive or capacitive stray effects are to be expected by parallel cables of the power
installation, shielded control lines should be used.
•If the motor / fan is used with an electronic speed regulation, it must be guaranteed that coupling to
the thermistor lines will not trigger a false alarm or prevent the device from triggering a correct stop
function.
•ZIEHL-ABEGG motors with fixed connecting cable
ZIEHL-ABEGG asynchronous motors MK085, MK106 and MK137 series and fans using these
motors come with a fixed connecting cable including both thermistor lines and supply lines.
Monitoring these motors / fans with a fixed connecting cable up to a maximum of 205 cm in length is
allowed.
Attention!
Extending the connecting cable is not allowed!
•The terminals Y1, Y2 may be attached parallel to a common reset mechanism. Thermistor lines must
not be connected.
•The line resistance within the thermistor circuit must not exceed a value of 20 Ω to ensure short
circuit detection.

U-EK230E
L-BAL-E185-GB 2023/10 Index 005
11660-0711-03
9/12
•Maximum permissible length for thermistor circuit lines:
Wire length
2 x 1000 m
2 x 800 m
2 x 500 m
2 x 300 m
2 x 250 m
Wire cross section
2.5 mm2
1.5 mm2
1.0 mm2
0.75 mm2
0.5 mm2
•With commissioning and after modification of the plant the thermistor resistance must be checked
with a suitable measuring instrument. With a resistance < 50 Ω the thermistor circuit is to be
examined for short-circuit.
Attention!
Check thermistors only with measuring voltages of < 2.5 V.
15.8 Safe separation
•Line circuits (A1, A2) and (11, 12, 14) have a safe separation to low-voltage electric circuits (T1, T2)
and (Y1, Y2).
15.9 Stop function
•A stop function triggered by the device must transfer the machine as fast as possible into a safe
state. The stop function must have top priority.
•In case of failure the device switches off the contactor / circuit breaker and prevents an overheating
of the isolation system and / or the surface temperature. The protective function of the device is only
guaranteed if the wiring is done directly in the control circuit of the motor in accordance with the
connection diagram. The contacts must be protected, to prevent welding.
15.10 Start and restart
•Only if no dangerous condition is present, a reset is allowed. A device with bridged terminals Y1, Y2
(auto reset) switches back on after the thermistors cooled down. This function must not be used in
applications where an automatic reset could cause personal injuries or damage to property
15.11 Manual reset
•When the device triggers a stop instruction, it must be maintained until the manual reset mechanism
is operated and safe conditions for a renewed start are given. The manual reset must be only
possible if all safety functions and protection devices are effective.
•The stop instruction remains, until a reset is made by pressing the push-button „Reset“. A start-up is
only possible, if no case of failure occurs and the motor is cooled down to a sufficient value of
temperature.
•The device switches on automatically with return of supply voltage. The user must guarantee by
external interlock (see connection diagram) that the supervised machine does not start again
independently.
Attention!
Safety circuits according to EN 60204 / EN 62061. The devices must not be used
alone for functions, where an automatic restart must be prevented.
16 Proof testing of the safety functions
•The safety function must be tested at regular intervals. It is recommended to carry out the proof-test
once a year. Depending on the zone risk, tests should be conducted more frequently. A fault is
recognized by the safety test. A fault between safety tests could cause loss of protection.
The following must be tested additionally to recurring examinations with maintenance services:
•The safety function must be tested by interrupting the thermistor circuit wire at terminals T1, T2.
•The short circuit monitoring function must be tested by bridging the thermistor circuit wires at
terminals T1, T2.
•The safety function must be tested by changing the resistance from 50…1500 Ohm to 4000 Ohm at
terminals T1, T2.
•The function of the electronic interlock must be tested additionally.
•If an error is detected no restart must be induced until the error is cleared.

U-EK230E
L-BAL-E185-GB 2023/10 Index 005
11660-0711-03
10/12
17 Maintenance and repair
•The devices are maintenance free. Only the manufacturer may perform repairs. We recommend
testing within the regular maintenance intervals of the plant, where the device is used. EN 60079-17
is to be observed.
•The guarantee presupposes the observance of these operating instructions (safety and start-up
instructions).
18 Disposal / Recycling
Disposal must be carried out professionally and in an environmentally friendly way in accordance with
the respective national legal stipulations.
•Separate the materials by type and in an environmentally-friendly way.
•If necessary, commission a specialist company with the waste disposal.
WEEE marking
Disposal of waste electrical and electronic equipment (applicable in the
European Union).
Equipment affected by this is indicated by the corresponding symbol.
You can find further information on this on our website.
19 Manufacturer reference
Our products are manufactured in accordance with the relevant international regulations. If you have any
questions concerning the use of our products or plan special uses, please contact:
ZIEHL-ABEGG SE
ZIEHL-ABEGG UK Ltd.
Heinz-Ziehl-Straße
Springfield Business Park
74653 Künzelsau
Chelmsford, Essex, CM2 5AS
Deutschland
United Kingdom
Telefon: [phone]
Fon + 44 1245 449010
[e-mail]
[e-mail]
http://www.ziehl-abegg.de
http://www.ziehl-abegg.com
20 Service information
If you have any technical questions while commissioning or regarding malfunctions, please contact our
support department for control systems - ventilation technology.
phone: [phone]
Email: [e-mail]
Our worldwide contacts are available in our subsidiaries for deliveries outside of Germany
see www.ziehl-abegg.com

21 EU-Declaration of conformity

22 UKCA-Declaration of Conformity