Signal and sensor error info via display front HHT 4624
Sensor error (see limits in the table) is displayed as SE.BR (sensor break). Signals outside the selected range (not sensor error,
see table for limits) are displayed as IN.LO indicating low input signal or
IN.HI indicating high input signal. The error indication is displayed in line 1
as text.
Signal and sensor error indication without display front
Status of the unit can also be read from the green LED in the front of the device.
Green flashing LED 13 Hz indicates normal operation.
Green flashing LED 1 Hz indicates sensor error.
Relay functions
5 different settings of relay function can be selected.
Setpoint: The unit works as a single limit switch
Window: The relay has a window that is defined by a low and a high
setpoint. On both sides of the window the relay has the
same status.
Error function: The relay is activated by sensor error.
Power: The relay is activated as long as the power is on.
Off: The relay is deactivated.
Increasing/decreasing: The relays can be set to activate at increasing or
decreasing input signal.
Delay: An ON and an OFF delay can be set on both relays in the range
0...3600 s.
Hysteresis: A hysteresis can be set at 0.1...25% of the span.
The window function is selected by choosing ”window” in the menu and
defining a high and a low setpoint.
It can be selected for each relay contact whether the contact is open or closed
inside the window. This selection is made in the menu R1.cont and R2.cont.
The setpoint function is selected by choosing ”setpoint” in the menu and
entering the desired limit. The device then works as a single limit switch.
An activated relay means that the contact is closed if the contact function ”normally open” is selected, and the contact is open if the contact function”normally closed” is selected.
The delay time for activation and deactivation can be set independently of each
other in the menus ON.DEL and OFF DEL respectively.
Advanced functions
The device gives access to a number of advanced functions which can be
reached by answering “Yes” to the point “adv.set”.
Two-point process calibration: The device can be process-calibrated in 2
points to fit a given input signal . A low input signal (not necessarily 0%) is
applied and the actual value is entered. Then a high signal (not necessarily
100%) is applied and the actual value is entered. If you accept to use the
calibration, the device will work according to this new adjustment. |
