TR-42 Temperature Protection Relay
2
Instruction Manual: TR42 GBM 25/02/2021
5.
4-20mA OUTPUT (Optional: see ORDER CODE)
An indicator can be connected to the 4-20mA output (polarity must be respected). The maximum load impedance is 500
Ω
. The loop is isolated to ensure
maximum immunity from disturbances.
Ratio between output current and temperature:
I
out =
(T/15) + 4 [mA]
where T = °C temperature
Note: It is recommended a shielded and twisted cable, avoiding bends or ring windings, placed away from power cables.
Symbols used in the text:
°C
PT
Blinking Displays
Two blinking displays alternate between the options on the first
row and the second row.
°C
PT
Fixed Displays
Example:
RANGE: 2; 3; 4
→
select
2
, or
3
, or
4
(select among the elements on the list).
RANGE: 2 ÷ 4
→
select
2
, or
3
, or
4
(select any value within the indicated
parameters).
6.
ACTUAL VALUES
Each time the device is powered on, it turns on all LEDs and displays for about 2sec. Once this operation is over, the device begins to function automatically
in Current Temperature (AUTO) mode.
Current Temperature (AUTO)
X X X
Y
XXX:
Temperature;
Y:
PT channel
Y:
1; 2; 3 if
PT SENSORS CONNECTED =
3
Y:
1; 2; 3; 4 if
PT SENSORS CONNECTED =
4
Press the SET, °C MAX, AUTO button until the °C MAX LED and the SET
LED are off.
The user will see the actual temperature on the °C display and the relative
PT sensor input on the PT display. To manually scroll through the PT
channels, press the UP/DOWN buttons. The SET and °C MAX LEDs are
off.
Maximum Temperature (
o
C MAX mode)
X X X
Y
XXX:
Temperature;
Y:
PT channel
Y:
1; 2; 3 if
PT SENSORS CONNECTED =
3
Y:
1; 2; 3; 4 if
PT SENSORS CONNECTED =
4
Press the SET, °C MAX, AUTO button until the °C MAX LED is on. The user
will see the maximum temperature reached on the °C display and the
relative PT sensor input on the PT display. To manually scroll through the
PT channels, press the UP/DOWN buttons.
By pressing ENTER for 2sec, the last maximum temperature of the
visualized PT sensor is cleared and the next °C reading will be considered
the maximum. During this operation, the SET LED is off.
7.
SETPOINTS
Press the SET, °C MAX, AUTO button until the SET LED is on.
PROGRAMMING MODE (SET mode)
By pressing SCAN (UP/DOWN buttons), the user can navigate the setpoints. Once on the menu option desired, the display will blink between the new value
and the value currently set.
STEP 1: keep the ENTER button pressed for at least 2sec.
STEP 2: insert the password (three digits) with UP/DOWN and ENTER buttons. If the password is correct, the value to be modified will blink. Otherwise, the
display will show
for a few seconds.
STEP 3: use the direction buttons to set the new value.
STEP 4: press ENTER to confirm.
Note: If the password is disabled or has been previously inserted, STEP 2 will be skipped.
PT SENSORS CONNECTED
;
Select the number of PT sensors connected.
ALARM RELAY (L1)
÷
Step: 1
Set the value at which the L1 contact will operate.
The dropout (reset) value is 2°C less than the setpoint.
Note: L1 must be < L2.
TRIP RELAY (L2)
÷
Step: 1
Set the value at which the L2 contact will close.
The dropout (reset) value is 2°C less than the setpoint.
Note: L2 must be > L1.
FAN ACTIVATION
;
If a fan is connected to the FAN contact, select
ON
.
FAN OFF LEVEL
÷
Step: 1
FAN will be turned OFF at this temperature.
Based on the thermal inertia of the system, choose an appropriate
temperature delta between FAN L and FAN H.
FAN ON LEVEL
÷
Step: 1
FAN will be turned ON at this temperature.
Visib
le
onl
y
if
FA
N
ACT
IVATI
O
N
=
ON
