PR 4131 User Manual page 21

Signal and sensor error info via display front 4501
Sensor error (see limits in the table) is displayed as SE.BR (sensor break) or
SE.SH (sensor short). 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 3
as text and at the same time the backlight flashes. Line 4 of the display is a
status line which displays status of relay 1 and relay 2, COM (flashing bullet)
indicating correct functioning of 4501 and arrow up/down which indicates
tendency readout of the input signal. If the figure 1 or figure 2 flashes, the
unit has detected that the setpoint has been exceeded and that the relay is in
"delay" mode. When the delay time has passed and the relay makes/breakes,
the relay sign either displays or disappears.
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.
Steady green LED indicates internal error.
Relay functions
6 different settings of relay function can be selected.
Setpoint:
Window:
Error function: The relay is activated by sensor error.
power:
off:
Latch:
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: 0.0...100.0%.
The unit works as a single limit switch
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.
The relay is activated as long as the power is on.
The relay is deactivated.
The relay is latched. Only valid for setpoint and window
function.
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