89750147 Crouzet USA, 89750147 Datasheet - Page 150

• Manufacturer Part Number: 89750147
• Description: STAINLESS SLEEVE-MILL TEMP PRB
• Manufacturer: Crouzet USA

Specifications of 89750147

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

4
150
3100
1650
"reset"
Principles
Reset WITHOUT fault latching (Y1 and Y2 not connected for ETM2/ETM22)
3100
1650
PTC probe specification
According to standard DIN 44081 (or IEC 34-11)
Reset WITH fault latching (only for ETM2/ETM22) (Y1 and Y2 connected)
1
10
10
B.P.
B
C
D
S2
R( )
4000
1330
4
4
U
0
0
U
550
250
20
Unit power-up
Resistance between terminals T1 and T2
Output relay
-20
2
0
ϑ( C)
1
3
1
2
3
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).
B
C
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.
B
C
D
E
Resistance R (
Nominal temperature Tripping (°C)
Unit power-up
Latching contact
Resistance between terminals T1 and T2
Output relay
Ω)
For more information www.crouzet.com