Edwards nEXT200200, Инструкция по эксплуатации

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If the rotational speed of the pump decreases below 50% of the full speed, the pump
time can be set to recover rather than trigger a fail condition. The timer starts
immediately when the rotational speed of the pump decreases below 50% of the full
speed. If the rotational speed of the pump increases above 50% during the timeout
period, the timer will reset. If the rotational speed of the pump does not recover by the
end of the timeout period, the motor controller will trigger a fail condition and
decelerate the pump to rest.
The timer function is enabled when the pump is shipped. You can disable the timer
function. If the timer function is disabled, the pump will fail and decelerate to rest
immediately when the rotational speed of the pump decreases below 50%.
2.3.4 Analogue output
The pump controller produces an analogue output for monitoring four different system
parameters:
▪ Measured pump rotational speed (default condition)
▪ 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 proportional 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 time. You can
configure the controller to monitor different system parameter. Refer to Analogue signal
options on page 61 .
2.3.5 Automatic vent options
The manufacturer's TAV vent valve can be connected to the nEXT pump's controller. The
controller can give number of different venting options.
The drive electronics can control the rate of venting. Using this feature, the pump can be
vented from the full rotational speed in a controlled manner that will not damage the
pump bearings. When the rotational 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 venting options are available, that includes:
▪ Hard vent when the rotational speed decreases below 50%
▪ Controlled vent when the rotational speed is above 50% speed and hard vent is
below 50% speed
▪ Hard vent immediately through an applicable restrictor.
Controlled venting gives a quicker ramp down time by controlling the vent rate through
a single large orifice across the speed range of the pump. List of the venting options is
given in Vent options, vent valve connection and control on page 52 .
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B85200880_D - Introduction