Manual Deactivation Of The Latch Function - PR PReasy 4116 Manual

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 red/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 red LED indicates internal error.
relay functions
6 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.
latch: The relay is latched. Only valid for setpoint and window
function.
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 or between 1 and
2999 counts.
latch
When the setpoint is exceeded the relay outputs enters an alarm state. The
latch function of the 4116 will hold the relays in this state until the function
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is deactivated manually. The latch function can be applied when the relay
function setpoint or window is selected.
The latch function can be selected separately for each relay output. If the
configuration is copied from one device to another by way of the 4501, the
latch function must be reconfigured.
The latch function activates and holds the relays when the input signal rises
above or falls below the selected setpoints and the relay action has been
selected as increasing or decreasing.
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.
If the relay function "Error" is active, the relay will latch when a sensor error
occurs and will not be deactivated automatically when the sensor error is
rectified.
The relay can only be deactivated by an operator and only when the normal
conditions for deactivation are met. If the input signal still has a value that will
activate the relay, the relay will latch again.
See the graphic depiction of the setpoint and window functions on pages 62
and 63.

Manual deactivation of the latch function

If the relay outputs are activated and thereby latched, it will be indicated in
the display. The backlight flashes and the scrolling help text tells you how
to deactivate the output. Manual deactivation is carried out by way of the
front buttons on the 4501. Use
1
validate your selection. If the password protection has been activated, the
password must be entered in order to access the deactivation menu. See the
menu structure on page 59.
and to navigate in the menu and
2
to
3
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