ZIEHL MS220KA User manual

ZIEHL industrie –elektronik GmbH + Co KG
Daimlerstr.13, 74523 Schwäbisch Hall, Germany
+ 49 791 504-0, [e-mail], www.ziehl.de
Temperature Relays and MINIKA® Mains Monitoring Digital Panelmeters MINIPAN® Switching Relays and Controls Measuring Transducers Grid- and Plant Protection
Operating Manual MS220KA and MSR220KA
updated: 2020-08-10/Su
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PTC thermistor relay with short-circuit detection
Marking see type plate on the device - type examination certificate PTB 12 ATEX 3006 Issue 1

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Table of contents
1General Notes....................................................................................................................................... 3
2Display- and control elements............................................................................................................. 3
3Pre-Adjustment..................................................................................................................................... 3
4Application and brief description........................................................................................................ 4
5Summary of functions.......................................................................................................................... 4
6Connecting diagram............................................................................................................................. 4
7Function diagram ................................................................................................................................. 5
8Important Notes.................................................................................................................................... 5
9Installation ............................................................................................................................................ 5
10 Commissioning..................................................................................................................................... 6
11 Operating instructions......................................................................................................................... 6
12 Trouble –shooting and remedies........................................................................................................ 6
13 Technical data ...................................................................................................................................... 6
14 Dimensions - Design K......................................................................................................................... 8
15 Safety Instructions and references for putting into operation.......................................................... 8
15.1 Special remarks for explosive gas atmospheres areas (Zone 0, Zone 1 and Zone 2)..................8
15.2 Special remarks for use in the presence of combustible dust! (Zone 20, Zone 21 and Zone 22).9
15.3 Safety characteristics of the safety device...................................................................................9
15.4 Category and Performance-Level (EN ISO 13849-1) ..................................................................9
15.5 Application of the safety device used with equipment category (EN 50495/VDE 0171-18)..........9
15.6 Wiring........................................................................................................................................10
15.7 Safe separation.........................................................................................................................10
15.8 Stop function.............................................................................................................................10
15.9 Start and Restart.......................................................................................................................10
15.10 Manual resetting........................................................................................................................10
16 Proof testing of the safety functions................................................................................................. 11
17 Maintenance and repair...................................................................................................................... 11
18 EU-Declaration of Conformity............................................................................................................ 12

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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
MS220KA MSR220KA
Reset key-button
Alarm (red)
ON (green)
Alarm (red) DIN VDE V 0898-1-401
ON (green)
3 Pre-Adjustment
No settings are necessary on the devices. The tripping temperature is determined solely by the response
temperature of the connected PTC thermistors.
Depending on the number of PTC thermistors the following tripping temperatures and reset temperatures
arise related to TNF (detector operating temperature):
Tripping temperature
Reset temperature
1 PTC thermistor
TNF + 15 K
TNF + 5 K
3 PTC thermistors in series
TNF + 5 K
TNF –5 K
6 PTC thermistors in series
TNF
TNF –20 K

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4 Application and brief description
Ziehl PTC thermistor relays protect motors, transformers, machines and equipment against thermal
overload. Used in conjunction with respective PTC thermistors they provide a reliable temperature protection
in the temperature range 60 °C up to 180 °C.
ZIEHL PTC thermistor relays are conform to EN 60947-8 and are thus exchangeable. PTC-thermistors
according DIN VDE V 0898-1-401 (replacement for DIN 44081 and DIN 44082) shall be connected. PTC
thermistors are suitable for the installation into windings of electrical machines, bearings and transformers
as well as to monitor the temperature of liquid media, airflow and gases. With ATEX approval, explosion-
protected equipment in explosive gas atmospheres (marking G: gas) or in areas with combustible dust
(marking D: dust) can be protected.
5 Summary of functions
•1 thermistor circuit for 1…6 PTC thermistors
•Short-circuit detection within the thermistor circuit
•Output relay with 1 or 2 change-over contact (co)
•Operating status display with LED
A current monitors continuously the resistance of the sensors. In cold state, the resistance is <250 Ω per
sensor (sensor circuit < 1.5 kΩ). The relay has picked up and contacts 11/14 (21/24) are closed. The
resistance of the thermistor rises rapidly at detector operating temperature TNF. The relay release at a
resistance of 3…4 kΩ and contacts 11/12 (21/22) close. The devices also switch off in the case of detector
or line short-circuit (< approx. 20Ω) or detector or line interruption. MS types switch on automatically when
the temperature has decreased approx. 5 °C. MSR types store the switch-off and must be reset (to be
acknowledged) manually with the built-in key button or an external push-button. Power-on is recognized as
an automatic reset. With bridged terminals Y1 and Y2, the function reclosing-lock is disabled. Then the
device works like type MS.
6 Connecting diagram
Us = supply voltage
S1 = off-switch
S2 = push-button on
S3 = remote reset
H1 = indicator lamp fault
F1-F4 = fuses
K1 = contactor
1) = only with 2 co
2) = only MSR

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7 Function diagram
MS220KA (automatic reset)
MSR220KA (reclosing lock)
Caution! The released relay switches on automatically after a voltage dip.
8 Important Notes
Attention!
Observe safety rules and standards. Notice safety remarks!
DANGER!
Hazardous voltage!
Will cause death or serious injury. Turn off and lock out
all power supplying this device before working on this device!
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)
•K –Design; vertical terminal block, width 22.7 mm
•The devices must be installed in an enclosure of international protection class IP 5x or better.
•Terminals with screw mounting M3 maximum tightening torque 0,5 Nm

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When installing the device into the switchgear cabinet, please observe the max. admissible
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
has to be reduced.
10 Commissioning
Attention!
Before switching on make sure that the operational voltage Us of the
Type plate and the mains voltage are the same!
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 and 21,24 close.
The correct function of the tripping device must be checked by resistance simulation at terminals T1 and T2.
This check is also performed after changes to the installation.
11 Operating instructions
MSR220KA devices have an illuminated built-in reset button and can be manually reseted after a fault signal
(Red = alarm). For this purpose, also an external button (remote reset terminal Y1, Y2) can be used.
Terminals Y1 and Y2 may be bridged so the function reclosing-lock is disabled.
12 Trouble – shooting and remedies
Relay does not pick up. Please check:
•The supply voltage Us at terminals A1-A2 (green LED lights-up).
•The PTC’s at terminals T1-T2. In the case of disturbance the red LED lights-up.
•The resistance of a PTC circuit must be at 50 Ω < R < 1500 Ω. The terminal voltage T1-T2 is to be
measured < 2.5 Vdc with connected PTC.
•MSR types please push the key button “Reset”. The relay can pick up at resistance R < 1.65 kΩ and
the key button light changes from red to green. Alternatively reset can be done with closing an
external contact at terminals Y1-Y2 or with voltage recovery.
Relay does not release. Please check:
•With no PTC sensor connected the relay must release. The voltage at terminals T1-T2 must be
approx. 8 V.
In case of any other malfunctions, replace device. Please add a description of the occurred malfunction
when sending back for repair.
13 Technical data
Power supply (A1, A2)
Rated supply voltage Us
AC 110-120 V
AC 220-240
AC 380-415 V
(see type plate)
AC / DC 24 V
(without potentially separation)
Tolerance of voltage
AC 0,9 Us -1,1 Us
DC 21 ... 30 V
Frequency (AC)
50 / 60 Hz
Tolerance of frequency
45 Hz …65 Hz
Power consumption
< 2 W
On-period
100 %
Voltage dip buffer time
Max. 20 ms

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PTC thermistor input (T1, T2)
acc. DIN VDE V 0898-1-401
Number
1 ... 6 PTC thermistor in series
Rated response temperature TFS
60 °C … 180 °C
Response tolerance
+/- 6° C
Collective resistance cold thermistor
≤1.65 kΩ
Terminal voltage (PTC thermistor)
≤ 2.5 V at R ≤ 3.65 kΩ, ≤ 2 V at R ≤1.65 kΩ
≤ 9 V at R = 
Terminal current (PTC thermistor)
< 1 mA
Power consumption
< 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 –21,22,24)
EN 60947-5-1
Contacts
1 or 2 change-over contacts
Rated operational voltage Ue
250 V
Switching voltage max.
Max AC 415 V
Min 12 V
Switching current.
Max 5 A
Min 10 mA
Switching power max. (ohm resistive load)
120 W at DC 24 V
1250 VA
Rated operational current (Ie)
AC15
Ie = 3 A
Ue = 250 V
DC13
Ie = 2 A
Ue = 24 V
Recommended fuse
4 A (gG)
Mechanical contact life
3 x 107operations
Electrical contact life
1 x 105 operations at 240 V/ 6 A
UL electrical ratings
250 V ac, 3 A, general use
240 V ac, 1/4 hp, 2.9 FLA
120 V ac, 1/10 hp, 3.0 FLA
C 300
Electrical Safety - Testing conditions
IEC/EN 60947
Rated insulation voltage Ui
300 V
Rated impulse voltage
4000 V
Overvoltage category
III
Contamination level
3
Transformer
EN 61558-2-6
Proof Test Voltage
2500 VAC
50 Hz
Ambient conditions
Fitting position
any
Rated ambient temperature range
-20 ... +55° C
Storage Temperature range
-10 …+70 °C
(1K3 EN60721-3-1)
Alltitude
≤2000 m above sea level
Climatic conditions
5-85% rel. F., no condensation
(3K3 EN60721-3-3)
Vibration resistance EN 60068-2-6
2…13.2 Hz ± 1 mm
13.2 ... 100 Hz ± 0,7g
EMC - Immunity
EN 61000-6-2
EMC - Emission
EN 61000-6-3

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Housing
Design K
Dimensions (H x W x D) mm
75 x 22.5 x 115
Plastic Material
PA 66
Fire protection class
UL 94V-2
Protection class housing EN 60529
IP 30
Mounting EN 60715
standard rail 35 mm
Optional: Screw mounting
M4, only with additional bolt (not part of
delivery)
Weight
approx. 150 g
Connection terminals
Screw mounting M3
Protection class terminals EN 60529
IP 20
Tightening torque
0.5 Nm
Line connection solid wire
1 x 0.5 ... 2.5 mm2(AWG 22 –14)
Stranded wire with insulated ferrules
1 x 0.14 mm2…1.5 mm2
Insulation strip length min.
8 mm
Subject to technical modifications
14 Dimensions - Design K
Dimensions in mm
1 Bottom
2 Top
3. Bolt
4 Screw
5 Holes for screw mounting
15 Safety Instructions and references for putting into operation
–please read carefully!
15.1 Special remarks for explosive gas atmospheres areas (Zone 0, Zone 1 and Zone 2)
•The increased danger within hazardous areas 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 European Standard EN 60079-14. All work for the connection,
for putting into operation and maintenance is to be implemented by qualified, responsible technical
personnel. Inappropriate behavior can cause heavy personal damage and damages to property.

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•The response of the thermal motor protection must directly switch off the motor, also when used
together with converters. This must be realized in the logic section or configuration in the converter.
•The tripping device may be installed only outside potentially explosive atmospheres for the protection
of explosive-protected motors. When used in potentially atmospheres, the device must comply with
the required type of protection.
15.2 Special remarks for use in the presence of combustible dust! (Zone 20, Zone 21 and Zone 22)
•The increased danger within hazardous areas of combustible 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 European Standard EN 60079-14.
Installation, electrical connection and commissioning to be carried out by trained service personnel
only. Inappropriate behaviour can cause heavy personal damage and damages to property.
•The tripping device may be installed only outside potentially explosive atmospheres for the protection
of explosive-protected motors. When used in potentially explosive atmospheres, the device is to be
provided with a dust proofed enclosure according EN 60529.
15.3 Safety characteristics of the safety device
Safety Integrity Level (EN 61508) and safety related parameters
Operating mode
Hardware architecture
HFT
Safety Integrity Level
low demand mode
1001
0
SIL 1
Type
MTBF
PFH
SFF
SD
SU
DD
DU
MS220KA
54 years
4.07E-07
55%
4.44E-07
5.55E-08
0
4.07E-07
MSR220KA
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
MS220KA
PFDavg
1.78E-03
5.35E-03
8.91E-03
1.78E-02
MSR220KA
PFDavg
1.87E-03
5.60E-03
9.33E-03
1.87E-02
Observe proof test interval according EN 60079-17 for electrical equipment ≤ 3 years.
15.4 Category and Performance-Level (EN ISO 13849-1)
The devices fulfil 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.
15.5 Application of the safety device used with equipment category (EN 50495/VDE 0171-18)
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 Under 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 tripping relay thus is suitable as safety device for Equipment Under Control (EUC) Category 3 (HFT = 0)
in Zone 1 and Zone 21 and for Equipment Under Control (EUC) Category 2 (HFT = 1) in Zone 0 and Zone
20. The combined equipment shall comply with the relevant standards EN 60079-0 respectively EN 61241
according to the categories to match.

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15.6 Wiring
•The lines of the thermistor circuit are to be routed as separate control lines as far as to the motor
line. The use of lines of the supply cable or other mainstream 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.
•Used with electronic speed regulation the thermistor lines must be routed separately from the power
lines as far as to the motor line, in order to avoid EMC distortion and thus false signal release.
•With devices type MSR the terminals Y1, Y2 may be attached parallel to a common resetting
mechanism. Sensor lines may not be connected together.
•The line resistance within the sensor circuit may not exceed a value of 20 Ω.
•Maximum of permissible length for sensor circuit lines:
Wire cross section
Wire length
2,5 mm 2
2 x 1000 m
1,5 mm 2
2 x 800 m
1,0 mm 2
2 x 500 m
0,75 mm 2
2 x 300 m
0,5 mm 2
2 x 250 m
•With commissioning and after modification of the plant the sensor resistance must be checked with a
suitable measuring instrument. With a resistance < 50 Ω the sensor circuit is to be examined for
short-circuit.
Attention! Check PTC’s only with measuring voltages of < 2.5 V.
15.7 Safe separation
•Line circuits (A1, A2, 11, 12, 14) have a safe separation to low-voltage electric circuits (T1, T2, Y1,
Y2).
•Trip relays with supply voltage DC/AC 24 V are permissible only at power supplies according EN
61558-2-6 where protected wiring is used.
15.8 Stop function
•A stop function released by the protection device must transfer the machine after manipulation of this
function as fast as possible into a safe condition. The stop function must have top priority.
•In case of failure the relay switches off the contactor/circuit breaker and so prevents an overheating
of the isolation system and/or the surface temperature. The protective function of the equipment is
guaranteed only if wiring is done directly into the control circuit of the motor/machine in accordance
with the connection diagram. The contacts must be protected, in order to prevent welding.
15.9 Start and Restart
•A restart may take place automatically only if no dangerous condition can be present. The tripping
devices of types MS220KA are equipped with an automatic reset function. For this device design,
suitable wiring of the control units must be ensured to prevent automatic restarting of the explosive-
protected motor of the type of protection Increased Safety „e“ in case of failure.
15.10 Manual resetting
•After introducing a stop instruction by the protection device this must be maintained, until the manual
resetting mechanism is operated and safe conditions for a renewed start are given. The manual
resetting may be only possible, if all safety functions and protection devices are effective.
•Trip devices type MSR 220KA have an electronic reclosing lock. The stop instruction remains, until
by pressing the push-button „Reset“ a reset is made. A start-up is only possible, if no case of failure
occurs and the motor is cooled down to a sufficient value of temperature. Trip devices type
MSR220KA switch on automatically with return of supply voltage. The user must guarantee by
external interlock (see connection diagram) so the supervised motor/machine does not start again
independently.