Edwards nEXT85 User Manual

Power limit seng
Use this feature to select the maximum power that will be drawn by the pump. The more
power supplied, the quicker the pump will accelerate to reach full speed.
If the applicaon requires 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 4 on page 37). 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 nEXT85 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 91.
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 39).
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
40). 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%.
Analogue output
The motor controller produces an analogue output for monitoring system parameters.
The
ve dierent system parameters are:
• Measured pump rotaonal speed (default condion)
• Measured link power
• Measured motor temperature
B8G0-00-880A - Overview of the nEXT85
Page 14

Edwards nEXT85 Specifications

General

Brand	Edwards
Model	nEXT85
Category	Water Pump
Language	English