GESTRA NRR 2-52, Original Installation Instructions

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Operating & display unit URB 50
- continued -
Explanation of icons
Icon Description Icon Description
MAX switchpoint MAX switchpoint 2 (NRR 2-53)
MIN switchpoint MIN switchpoint 2 (NRR 2-53)
Setpoint Level
Allowance made for influence of difference
(steam flowrate - feedwater flowrate) on
liquid level
Go to parameter setting window for level
electrode. This button is not available if a
level transmitter is connected.
Go to parameter setting window for control
valve. This button is only available for the
level controller NRR 2-52 and if a potentio-
meter is provided for indicating the valve
position.
Position of the control valve if a potentio-
meter is provided for indicating the valve
position
i
Position of control valve in case of internal
feedback
Calibration of upper end of level measuring
range and valve CLOSED (indication of
valve position via potentiometer)
Calibration of end of level measuring range
Calibration of valve OPEN (indication of
valve position via potentiometer)
Control valve is motored into OPEN position Control valve is motored into CLOSED
position
Go to parameter setting window for con-
troller
Proportional band, adjustable between
10 and 150 %, based on the setpoint,
Integral action time: adjustable between 0
and 120 sec.
Neutral zone (dead band), adjustable
b / –
0 and 5%, based on the setpoint,
Valve travel time: adjustable between 10
and 600 sec.
Go to parameter setting window for 3-ele-
ment controller
Feedwater flowrate
Steam flowrate
Go to parameter setting window for ana-
logue signal inputs 4-20 mA.
Go to trend log window.
Move trend log window 1 hr forward Move trend log window 1 hr backwards