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TriScroll 300 Inverter Vacuum Pump
14
CT-100 Speed Control Kit
Agilent offers an optional speed control kit (P/N#:
PTSCNTRLKIT1 for an NW25 port, and PTSCNTRLKIT2
for an NW40) for use with the TriScroll inverter pumps
(P/N#: TS0X00INVXX), which allows automatic switching
from full pumping speed to a lower speed. Operation at
lower speed reduces noise and can extend maintenance
intervals.
This speed control kit consists of a CT-100 Active Rough
Vacuum Gauge, a communication cable, a 24 VDC
power supply, a power splitter cord, a tee, a centering
ring, and a clamp.
Two set points can be set on the CT100 gauge. When the
pressure is:
❑
Over the high set point (SP1), the inverter drives
the pump at full speed*.
❑
Below the lower set point value (SP2), the scroll
is driven at minimum speed**.
❑
Higher than set point 2, but lower than set point
1, the driving frequency is: (full speed +minimum
speed)/2.
Set points are user-selected. For a faster pumpdown,
lower SP1 and the pump can stay longer at full speed. For
quieter operation, increasing SP2 and the pump runs
longer at the lower frequency.
* Full speed: customized frequency setting via Agilent
T-plus software if used. Factory setting is 62 Hz.
** Minimum speed: 35 Hz
Pumping speed changes compared with factory setting,
but the effect is less at lower inlet pressures. Figure 9
shows the pumping speed percentage drop at peak
pumping speed and at 100 mTorr inlet pressure.
Figure 9
Pumping Speed Percentage Drop
Please refer to manual (P/N 699904375) for installation and operation details.
