2
Alarm and trip set up.
The SETUP step concerning alarm threshold starts from the set of channel n.1 and its led placed on measurement display turn on.
With the channel 1 led lights, in the same time the turn on ALARM led which it’ s always relative to channel 1 that shows SET step of alarm threshold :
Set range from 5°C to trip threshold value - 1 °C.
ENTER to confirm
Successfully the TRIP led lights to indicate the set step of channel 1 TRIP threshold .
Set range from + 1 °C alarm threshold to 200 °C
ENTER to confirm
Repeat all the operations for the successive measurement channels.
Node identifier for MODBUS network
This setting is meaningless for the CTT without serial interface installed.
On display T1-T2-T3-T4 will be displayed
I d
I dI d
I d, on display T5-T6-T7-T8 will be displayed the node identifier value.
Setting value range is from
0 to 255
For to set this function use⇐ and ⇒ buttons, select the right value, then confirm with ENTER button.
SETUP exit
Push SET button to exit from SETUP.
TRIP AND RESET MODALITIES
Alarm
When value threshold exceed than 1 °C , after 5 seconds, Alarm relay is active and we have the Alarm led channel lights which underlines the exceeded
threshold value.
The alarm condition ri-entry with the consequent release relays and relative turn off led it’ s possible when temperature drops 2 °C than set threshold value.
Trip
When value threshold exceed than 1 °C , after 5 seconds, Trip relay is active and we have the turn on Trip led channel which underlines the exceeded
threshold value.
The re-entry of TRIP condition it’ s possible when the temperature drops 2 °C than the set threshold value.
Alarm acknowledgement.
When Hold function isn’ t operating it’ s possible to acknowledge the alarm condition that it’s present on measurement inputs.
When there is an alarm condition, alarm relays and led “ alarm “ set going.
Pushing RESET button relay doesn’ t work while alarm condition led starts flashing.
If temperature increases until to reach Trip temperature -1°C , relay and led will be ri-activated.
If after the acknowledgement temperature drops under the set threshold value, the flashing led will be set automatically.
DIAGNOSTIC
The control units CTT is provided with diagnostic function probes.
The conditions checked on 8 measurement inputs are the following :
• Pt 100 probe disconnected indicating
OPE
OPEOPE
OPE message on display
• short-circuit of probe indicating
SHR
SHRSHR
SHR message on display
At the moment of control unit switching – on the Fault autodiagnostic relay switches over and keep on excited condition until some anomalies described
before arise .
An anomaly condition can be signalled also by flashing FAULT led.
OUTPUT RELAY STATUS
RELAY INACTIVE STATUS ACTIVATED STATUS UNPOWERED STATUS
ALARM ALARM OFF: CLOSED 29-30 ALARM ON: CLOSED 29-31 CLOSED 29-30
TRIP TRIP OFF: CLOSED 32-33 TRIP ON: CLOSED 32-34 CLOSED 32-33
FAULT FAULT OFF: CLOSED 38-40 FAULT ON: CLOSED 38-39 CLOSED 38-39
VISUALIZATION OF MAXIMUM VALUES OF MEASUREMENT TEMPERATURE.
Pushing Tmax button it’s displayed through flashing led, the maximum temperature values reached for 8 seconds. : after that time the unit control returns to
display measured temperature values.
With the pushbotton ⇐
⇐⇐
⇐ and ⇒
⇒⇒
⇒ is possible to check all the maximum temperature reachead on any measure channels
For to reset maximum temperature values we have to display the Tmax values and successfully to push at the same time T max and ← buttons.
VISUALIZATION OF HIGHER TEMPERATURES CHANNELS.
Push HOT button for some seconds until the turn-on Hot led.
On display placed on the left hand of the frontal panel will be displayed the temperature of measurement warmer channel between the CH1 – CH4 inputs.
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