Testing The Safety Function - Eaton EMT62 Manual

3 Installation

3.3 Testing the safety function

3.3 Testing the safety function
48
The safety function needs to be tested during commissioning as per the
interval for retesting (proof test) and when performing maintenance work.
It is recommended to test it once a year.
The following tests are necessary:
Measuring the terminal voltage at Y1/T1 (disconnect the sensor at T1/T2 for
this purpose):
• The voltage must fall between 18 and 24 VDC.
Functional test, including sensor circuit, with resistance simulation at sensor
input T1/T2 (disconnect the sensor for this purpose) in auto mode:
Short-circuit recognition test: Reduce the resistance from 50 Ω to 15 Ω,
•
increase the resistance to 30 Ω (the state must not change)
• Open-circuit monitoring test: Disconnect the cable at the sensor input
• Overtemperature detection test: Increase the resistance from
50 - 1500 Ω to 4 kΩ, reduce the resistance to 1750 Ω (the state must
not change), reduce the resistance to 1500 Ω.
In the case of models EMT6-KDB and EMT6-DBK, the fault memory also
needs to be tested. To do this, manual mode needs to be activated first:
Connect a resistor or sensor to the sensor input (50 - 1500 Ω )
•
• Use the Test/Reset button to create an error condition
• The error condition must be maintained
• Reset with remote reset:
The error condition must be reset.
In the case of model EMT6-DBK, the device's protection against the effects
of voltage loss also needs to be tested. To do this, manual mode needs to be
activated first (sensor connected to T1/T2).
Connect a resistor or sensor to the sensor input (50 - 1500 Ω )
•
• Create an error condition – using the Test/Reset button, for example
• Switch off the supply voltage for 1 second:
• After the supply voltage is switched back on, the error condition must be
maintained.
NOTICE
If a fault is detected, a restart must not be initiated until the fault
has been eliminated.
EMT6 10/16 MN03407006Z-DE/EN www.eaton.com