Edwards nEXT nEXT85 - Analogue Output; Automatic Vent Options

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 gives an analogue output for monitoring ve parameters of the
system:
▪
Measured pump rotaonal speed (default condion)
▪
Measured link power
▪
Measured motor temperature
▪
Measured controller temperature
▪
Measured rotor power
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 on page 14.
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 a dierent system parameter. Refer to Analogue
signal opons on page 63.
2.3.5 Automac vent opons
The manufacturer's TAV vent valve can be connected to the motor controller. The motor
controller can give a number of dierent venng opons and can be congured for a
normally closed and a normally open vent valve.
The motor controller 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 pump rotaonal speed 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 include:
▪
Hard vent when the rotaonal speed decreases below 50% speed.
▪
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 quicker ramp down me by controlling the vent rate through a
single large orice across the speed range of the pump. A list of the venng opons is
given in Vent opons, vent valve connecon and control on page 68.
Page 13
B8G000880_D - Introducon