Edwards nEXT730D User Manual

If the applicaon r
equires fast cycling or higher gas loads, set the power limit to the
maximum value. If ramp me is not important in the applicaon, use a lower power
limit, down to a minimum value (refer to Table: Power limit seng). Also ensure there is
sucient cooling for the applicaon.
Ensure that the power supply is capable of delivering sucient power to the nEXT pump.
By choosing a lower power limit seng, a smaller power supply may be used. For more
informaon, refer to Electrical data on page 34.
3.3.2 Standby speed
In standby mode, the pump rotaonal speed is lower than the full rotaonal speed. The
default seng for standby speed is 70% of full speed.
To run at standby speed, the pump must also be in the start condion.
If the applicaon does not require the pump to be running at maximum speed at all
mes, use the standby speed feature rather than switching the pump o. This feature
can be used for vacuum system tuning or as a system power saving opon.
The standby speed is a user-selectable value (refer to Standby speed seng on page 70).
3.3.3 Timer
When the pump is started, an internal mer is automacally started within the motor
controller. The default mer seng is 8 minutes.
If the pump fails to reach 50% of full rotaonal speed within the meout period, the
motor controller will signal a fail and will decelerate the pump to rest. This feature
prevents the motor controller from driving the pump at maximum power for a long me.
The pump may fail to reach 50% speed if the gas load is too high (for example if there is
a leak in the system), if the backing pump fails or if the pump is too hot.
The meout period is a user-selectable feature (refer to Timer seng and opons on
page 71). If the applicaon requires the pump to ramp up slowly, extend the meout
period. The mer is permanently enabled for ramp-up.
The mer has an addional funcon; if the pump rotaonal speed drops below 50% of
full speed for any reason, the pump me can be set to recover rather than trigger a fail
condion. The mer starts as soon as the speed drops to below 50% full speed. If, during
the meout period, the pump recovers to above 50% full speed then the mer will be
reset. If the pump rotaonal speed fails to recover by the end of the meout period, the
motor controller will trigger a fail condion and will decelerate the pump to rest.
When the pump is shipped, the mer funcon is enabled, however, it can be disabled.
With the mer disabled, the pump will fail and decelerate to rest as soon as pump
rotaonal speed falls below 50%.
3.3.4 Analogue output
The motor controller can produce an analogue output for monitoring system
parameters.
▪ Measured pump rot
aonal speed (default condion)
▪ Measured link power
▪ Measured motor temperature
08/2021 - ©Edwards Limited
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B8J200880_D - Overview

Edwards nEXT730D Specifications

General

Brand	Edwards
Model	nEXT730D
Category	Water Pump
Language	English