29
NRR 2-50, NRR 2-51 - USA - Installation & Operating Manual -
850699-00
Operation, alarm and test
Level controller NRR 2-50 Indications
Operation
Action
Indication
Function
Actual value = set
point
MIN and MAX LEDs are not lit
MIN output contacts 16/18 open,
17/18 closed.
MAX output contacts 21/23 open,
22/23 closed.
MIN alarm
MIN water level
switchpoint reached or
exceeded.
MIN LED flashes red
Off delay in progress.
MIN LED lights up red
Delay time elapsed, MIN output contacts 16/18
closed, 17/18 open.
MAX alarm
MAX water level
switchpoint reached or
exceeded.
MAX LED flashes red
Off delay in progress.
MAX LED lights up red
Delay time elapsed, MAX output contacts 21/23
closed, 22/23 open.
Operation
Action
Indication
Function
Actual value = set
point
Valve and MIN/ MAX LEDs are
not lit
Valve output contact 16/17/19 open.
MIN/ MAX output contacts 21/23 open,
22/23 closed.
Value above or below set point
Value above or below
set point.
Valve OPEN LED flashes yellow Control valve opens, valve output contact
16/19 closed.
or
Valve CLOSED LED flashes
yellow
Control valve closes, valve output contact 17/19
closed.
MAX alarm
MAX water level switchpoint
reached or exceeded.
MAX LED flashes red
Off delay in progress.
MAX LED lights up red Off delay elapsed, output contacts 21/23 closed,
22/23 open.
or
MIN alarm
MIN water level switchpoint
reached or exceeded.
MIN LED flashes red
Off delay in progress.
MIN LED lights up red
Off delay elapsed, output contacts 21/23 closed,
22/23 open.
Level controller NRR 2-51 Indications
