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TECSYSTEM S.r.l. has designed its own special cable to transfer the measurement signals, CEI-compliant, with all
the protection requirements provided for: model CT-ES.
NOTE: the use of cables not complying with the above might cause reading anomalies. It is always important to take
into account that any interference on the signal lines might cause anomalies on the Pt100 inputs (CH1-CH2-CH3-
CH4..........................CH24) or on the sensors themselves.
All "M" series control units have linearity of the sensor signal, with a maximum error of 1% of full scale value.
TEMPERATURE SENSOR DIAGNOSTICS
In case of failure or exceeded full scale value of one of the thermometric sensors installed on the machine to protect, the
FAULT relay opens immediately with the relative warning of faulty sensor on the corresponding channel.
Fcc indicates sensor short-circuited or minimum full scale value of the control unit exceeded
Foc indicates sensor interrupted or maximum full scale value of the control unit exceeded
To eliminate the message and reset the opening of the Fault contact, it is necessary to check the Pt100 connections and
replace the faulty sensor (if any). If the minimum/maximum full scale value has been reached, check that the ambient
conditions match the control unit reading.
Note: exceeding the minimum/maximum full scale value can also be caused by interference on the sensor lines; in this
case we recommend that you check: the correct installation of the sensors and above all of the extension cable (as
stated in the paragraph MEASUREMENT SIGNAL TRANSFER)
TEMPERATURE DIAGNOSTICS
When one of the temperature sensors senses a temperature 1°C higher than the alarm threshold, 5 seconds later the
ALARM relay switches and the AL/AUX LED turns on: the page of the channel which generated the alarm displays ON
near the passed threshold (AL0, AL1-AL2 or AUX1-AUX2).
When the taken temperature returns to equal or lower values than the set limit for relay switching, these relays de-
energize with consequent turning off of relevant LED.
DISPLAY MODE
Pressing the MODE key, the display modes can be set:
SCAN: the monitoring unit displays a sequence of all activated channels (each 2 seconds)
HIGH: the monitoring unit automatically displays the hottest channel
MAN: manual reading of the channels temperature using the up/down
MEMO: the monitoring unit displays the alarm log updated to the last reset. Select the channels through the ▲
▼ keys and press RESET to reset the values.
USE AND OPERATION OF THE MM453 UNIT
The MM453 control unit consists of a system from 1 to 6 Pt100-P1000-TCK interchangeable cards.
Each card has 4 channels: the top card identifies the channels 1-2-3-4, the second 5-6-7-8 channels, the third card 9-10-
11-12 channels, the fourth 13-14-15-16 channels, the fifth 17-18-19-20 channels, and sixth 21-22-23-24 channels.
MM453 SERIES
1MN0035 REV. 0
1MN0034 REV. 0
keys
13
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