2.3 Operational features
The pump has basic start and stop commands and some other features that allows the
pump operation to be modified for an applicable application. Refer to
interface technical data on page 27
for factory default settings of the parameters given
in the sections that follows.
2.3.1 Power limit setting
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 application requires fast cycling or higher gas loads, set the power limit to the
maximum value. If ramp time is not important in the application, use a lower power
limit, down to a minimum value (refer to
Table: Power limit setting on page 57
). Also
ensure there is sufficient cooling for the application.
Ensure that the power supply is capable of delivering sufficient power to the nEXT pump.
By choosing a lower power limit setting, a smaller power supply may be used. For more
information, refer to
.
Table 1
Power limits
Pump
Standard default setting Maximum value setting
Minimum value
setting
nEXT200200
160 W
200 W
50 W
2.3.2 Standby speed
In standby mode, the pump rotational speed is lower than the full rotational speed. The
default setting for standby speed is 70% of the full speed.
To operate the pump at standby speed, it must be in the start condition.
If operating the pump at maximum speed at all times is not necessary for the
application, use the standby speed feature rather than setting the pump to off. You can
use the standby speed feature for tuning the vacuum system or as a power saving option
for the system.
The standby speed is a user
‑
selectable value. Refer to
Standby speed setting on page 59
2.3.3 Timer
When the pump is started, an internal timer is starts automatically in the drive
electronics. The default timer setting is 8 minutes.
If the pump fails to reach 50% of full rotational speed in the timeout period, the motor
controller will signal a fail and decelerate the pump to rest. This feature prevents the
motor controller from driving the pump at maximum power for a long time. The pump
can 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 timeout period is user
‑
selectable (refer to
Timer setting and options on page 60
). If
slow ramp
‑
up of the pump is necessary for the application, extend the timeout period.
The timer is permanently enabled for ramp
‑
up.
Page 12
B85200880_D - Introduction
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