5
T-154 0-240°C protection relays
TECSYSTEM S.r.l ®
6) MEASURE SIGNALS TRANSPORT
All transport cables of the Pt100 measure signals must absolutely:
• be divided from the power ones
• be realized with shielded cable with twisted conductors
• have a section of min 0.5 mm²
• be twisted if you have no shield
• be firmly fixed in the terminal board
• have tinned or silvered conductors
All units of the “T” series have the sensors linearization with a max error of 1% v.f.s..
7) THERMOMETRIC SENSORS DIAGNOSTIC
In the event one of the thermometric sensors installed on the machine to protect is dam-
aged, the FAULT relay energizes immediately, the ALARM and TRIP LED of the damaged
channel (Chn) lighten and the FAULT LED is lightening.
The screen will automatically display a message showing the fault condition:
• Fcc sensor is short circuited
• Foc sensor is open
During the unit normal operation, if the Fcd/YES function has been selected the display will
show Fcd indicating that a sensor is damaged and the LED corresponding to the affected
channel will lighten (Chn).
The FAULT relay energizes giving a signal to the operator.
After the replacement of the damaged sensor, you can RESET the alarm pushing RESET
until the display shows the message RST.
8) TEMPERATURES DIAGNOSTIC
When one of the thermometric sensors surveys a temperature exceeding by 1°C the alarm
limit, after 4 seconds the ALARM relay will energize and the ALARM LED of the affected
channel (Chn) will switch on.
The same occurs when the TRIP temperature limit is detected: the TRIP relay energizes
and the TRIP LED corresponding to the affected channel is lightening.
When the surveyed temperature declines of 1°C below the prefixed limit for the ALARM
and TRIP switching, the relays de-energize and the respective LED’s switch off.
TECSYSTEM has realised a special cable for the measure signal transport with all
the protection requirements in accordance with CEI Norms: mod. CT-ES
To Next Page
Loading...
Need help?
General
