Edwards nEXT200200 - Technical Data and Specifications; General Pump Specifications

If the r
otaonal speed of the pump decreases below 50% of the full speed, the pump
me can be set to recover rather than trigger a fail condion. The mer starts
immediately when the rotaonal speed of the pump decreases below 50% of the full
speed. If the rotaonal speed of the pump increases above 50% during the meout
period, the mer will reset. If the rotaonal speed of the pump does not recover by the
end of the meout period, the motor controller will trigger a fail condion and
decelerate the pump to rest.
The mer funcon is enabled when the pump is shipped. You can disable the mer
funcon. If the mer funcon is disabled, the pump will fail and decelerate to rest
immediately when the rotaonal speed of the pump decreases below 50%.
2.3.4 Analogue output
The pump controller produces an analogue output for monitoring four dierent system
parameters:
▪ Measured pump rotaonal speed (default condion)
▪ Measured motor power
▪ Measured motor temperature
▪ Measured controller temperature.
The range of the analogue output signal is from 0 to 10 V and is directly proporonal to
the system parameter. Refer to Logic interface connector on page 27.
Connect the analogue output to an applicable meter or indicator to display the
applicable system parameter or connect it to the customer control equipment (for
example, to operate other components in the pumping system at set values).
The analogue output can monitor only one system parameter at a me. You can
congure the controller to monitor dierent system parameter. Refer to Analogue signal
opons on page 61.
2.3.5 Automac vent opons
The manufacturer's TAV vent valve can be connected to the nEXT pump's controller. The
controller can give number of dierent venng opons.
The drive electronics can control the rate of venng. Using this feature, the pump can be
vented from the full rotaonal speed in a controlled manner that will not damage the
pump bearings. When the rotaonal speed of the pump decreases below 50% of the
maximum speed, it is safe to do a hard vent (open the vent valve fully).
Many venng opons are available, that includes:
▪ Hard vent when the r
otaonal speed decreases below 50%
▪ Controlled vent when the rotaonal speed is above 50% speed and hard vent is
below 50% speed
▪ Hard vent immediately through an applicable restrictor.
Controlled venng gives a quicker ramp down me by controlling the vent rate through
a single large orice across the speed range of the pump. List of the venng opons is
given in Vent opons, vent valve connecon and control on page 52.
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B85200880_D - In
troducon