TR400
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•
Relay locked active (Mode 4 = "1")
In this mode the relay can switch on when all the following parameters are full filled:
- the temperature decreases below the switching back limit
- the alarm relay delay-time t
ALARM
off has overrun
- a reset signal Y1,Y2 (reset push-button or external closed contact) is done or the mains (supply
voltage) is switched off and on.
In the ready for reset status the alarm-LED will be blinking 1x on 1x off .
•
2-wire technique line resistance compensation
To compensate the line resistance short-circuit the wires nearby the sensor and measure the line
resistance. Setting see mode 6.
We recommend to use 2 or better 3 wires for each sensor. With 2-wire connection and a common line
for all signals, all sensor measuring currents will be added on the common line. Thus the value of the
compensation line resistance RK must be calculated as follows:
RK = (n+1) x RL/2 (RL = line resistance of two wires, n = number of sensors)
•
Sensor Simulation
At this menu item a sensor (or sensor group) can be selected and with the buttons up/down a measured
temperature can be simulated. All functions of the device act as if the temperature was measured in
real.
If no button is pushed within 15 minutes the relay automatically returns in the normal function mode.
Table of function
Function
Key
Display
Sensor temperature
Sensor select 1 …4
group *
1)
*2)
Measuring temperature of selected sensor
or max. value of group of sensors
- MAX
▲
Highest measured temperature
since last Reset
- MIN
▼
Lowest measured temperature
since last Reset
- MIN - MAX- Reset
▲
or
▼
+ Reset
Reset MIN-/MAX- memory to actual measured
temperature
Relay locked Reset
Reset
Switching points
Alarm select 1 …4
Adjusted limit and sensor or sensor group for the
selected relay
*
1)
group: - sensor 1+2+3, - sensor 1+2+3+4, - sensor 1+2, - sensor 3+4
*
2)
Value of warmest sensor of group is displayed
