ETM / ETM2 / ETM22 motor thermal protection ETM22 Part number 84874034
•Version ETM :
Controls temperature of machines using built-in PTC probes
Line break or probe short-circuit detection
•Version ETM2 / ETM22 :
Fault latching function
Pushbutton for local reset
Remote reset via external contact
Pushbutton test facility
2 LEDs to indicate relay and power supply status
Part numbers
Type
84 874 034
ETM22
Output
2 changeovers
Supply voltage
230 V AC
Specifications
Supply voltage Un
230, 120 and 24 VAC 50 / 60 Hz
Galvanic isolation by transformer
24 VDC no galvanic isolation
0.85 to 1.10 Un
3 VA
5 VA
10 ms
500 ms
Category III, degree of pollution 2 conforming to IEC/EN 60664-1 / VDE 0110 : 4 KV/2
1500
Ω
3100
Ω±
10 %
1650
Ω±
10 %
0 - 10
Ω
≤ 2,5 V
± 0.5 %
± 0.05 % /
o
C
-2 %
AgNi 90/10
2000 VA / 80 W
8 A AC
440 V AC
100 mA
360 operations / hour at full load
5 x 10
6
AC12 : 2000 VA - 10
5
operations
AC15 : Cos
φ =
0,3 - 6000 operations
DC13 : L/R = 300 ms - 6000 operations
≤ 500 ms
≤ 500 ms
green LED
yellow LED
IP 20
IP 50
Self-extinguishing
145
2 x 1.5 mm
2
with ferrule
2 x 2.5 mm
2
without ferrule
-20 →+60 °C
-30 →+70 °C
95 % (+2 % ; -3 %)
Operating range
Nominal power
Maximal power
Immunity from micro power cuts
Delay on pick-up
Insulation coordination
Max. resistance of cold probes
Trip threshold
Reset threshold
Short-circuit detection
Measurement voltage as per IEC/EN 60034-11
Repetition accuracy with constant parameters
Temperature drift
Voltage-dependent drift
Output
Breaking capacity
Max. breaking current
Max. breaking voltage
Min. breaking current
Maximum rate
Mechanical life (operations)
Electrical life
Reset time
Response time
Display on ETM2/ETM22 - power supply
Display on ETM2/ETM22 - Relay
Class of protection (IEC EN/60529) - Term. block
Protection class (IEC EN/60529) - Casing
Housing material
Weight (g)
Terminal capacity
Temperature limit operation (IEC 68.1.14) (°C)
Temperature limits stored (IEC 68.1.1/2) (°C)
Relative humidity (no condensation)
Principles
Unless otherwise specified, the characteristics given are applicable to all or part of the product range selected
23/06/2014
www.crouzet.com
Operating principle
Control relay is used in combination with PTC thermistor probes (not supplied) for thermal protection of machines (motors, alternators, transformers, etc). The probes are placed at critical points on
the equipment to be protected (normally inserted into the stator windings of motors). The resistance of the PTC probe has a positive temperature coefficient. As soon as the nominal trip temperature
of the probe is exceeded, the resistance of the probe increases rapidly. Protection relay detects this and opens the power supply circuit of the protected equipment (eg motor) and the yellow fault
indicator LED lights up (version ETM2/ETM22).
Test button
The ETM2/ETM22 has a TEST button which can be used to simulate a thermal overload in order to test the service condition of the relay.
Tripping
The relay drops out as soon as the protected equipment is subjected to a thermal overload, short-circuit or break in the probe measuring circuit.
Early warning of tripping
If the equipment being protected has another PTC proble with a lower nominal trip temperature, a second ETM/ETM2/ETM22 relay can be used to give early warning of tripping and thus prevent
breaks in operation.
Control relay ETM/ETM2/ETM22 is automatically reset as soon as the temperature drops below the trip threshod (the yellow fault indicator LED goes out).
N
o
Legend
Unit power-up
Resistance between terminals T1 and T2
Output relay
Principles
The relay is reset either using the RESET pushbutton on the front face or by opening the external contact S2 (remote reset), or by cutting the auxiliary power supply (terminals A1 - A2).
If the auxiliary power is cut for a period of time greater than the reset time (500 ms), the relay is reactivated if the proble detects a normal temperature when the power supply voltage is restored.
N
o
Legend
Unit power-up
Latching contact
Resistance between terminals T1 and T2
Output relay
Principles
Unless otherwise specified, the characteristics given are applicable to all or part of the product range selected
23/06/2014
www.crouzet.com
The relay is reset either using the RESET pushbutton on the front face or by opening the external contact S2 (remote reset), or by cutting the auxiliary power supply (terminals A1 - A2).
If the auxiliary power is cut for a period of time greater than the reset time (500 ms), the relay is reactivated if the proble detects a normal temperature when the power supply voltage is restored.
N
o
Legend
Resistance R (Ω)
Nominal temprerature
Tripping (°C)
Dimensions (mm)
ETM / ETM2 / ETM22
Unless otherwise specified, the characteristics given are applicable to all or part of the product range selected
23/06/2014
www.crouzet.com
Connections
ETM22
Legend
A1 - A2 : supply voltage
11 - 12 -14 : low treshold output relay (R1)
21 - 22 -24 : high treshold output relay (R2)
T1 -T2 : external PTC probe
Y1 - Y2 : remote reset contact
Connections
ETM
Unless otherwise specified, the characteristics given are applicable to all or part of the product range selected
23/06/2014
www.crouzet.com
Legend
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Unless otherwise specified, the characteristics given are applicable to all or part of the product range selected
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