Gas Ballast; Bearing Purge; Purge Kit; Vpi Valve Installation Data - Varian TriScroll 300 Serie Manual De Instalación Y Funcionamiento

Wiring
Using the data in Table 19, verify that the VPI Valve
chosen is compatible with the TriScroll supply voltage
and frequency. Then, locate the proper wiring diagram to
use (Figure 4 on page 36 or Figure 5 on page 37).
.
Motor TriScroll Vacuum Pump
Operating Voltage
1 Phase 100-120 V 50/60 Hz
1 Phase 200-230 V 50/60 Hz
3 Phase 200 V 50/60 Hz
3 Phase 230 V 50/60 Hz
3 Phase 380 V 50/60 Hz
3 Phase 415 V 50/60 Hz
3 Phase 460 V 50/60 Hz
* Solenoid operating voltages are lower than the TriScroll vacuum pump operating voltages in order to utilize the TriScroll
motor's internal thermal switch to actuate the VPI Valve.

Gas Ballast

The pump incorporates an automatic gas ballast to
prevent water and other condensates from accumulating
within the pump. The standard configuration is a sintered
filter installed in the 1/4" National Pipe Thread gas ballast
port (item 9 on Figure 3 on page 35). This allows enough
atmospheric air to enter the pump in order to purge
condensates while not effecting pump ultimate pressure
or pumping speed.
For applications where the ingress of atmospheric air is
undesirable, dry nitrogen at a flow rate of
bled into the gas ballast port. See "Purge Kit" below.
Blocking of the gas ballast port is not recommended.
TriScroll 300 Series Vacuum Pump
Table 19

VPI Valve Installation Data

VPI Valve Part # VPI Valve Part #
NW25
VPI251205060 VPI401205060
VPI251205060 VPI401205060
VPI251205060 VPI401205060
VPI251335060 VPI401335060
VPI252205060 VPI402205060
VPI252205060 VPI402205060
VPI252665060 VPI402665060
≈
5 lpm can be
1. Remove the three screws (item 12 in Figure 3 on
page 35) that are holding the motor electrical cover
(item 13 in Figure 3).
2. Connect the VPI Valve solenoid wire leads to the
pump motor as shown in Figure 4 or Figure 5.
3. Replace the motor electrical cover. Verify that the
valve is properly grounded before applying
electrical power
Solenoid Operating
NW40 Voltage Range
90-132 V
90-132 V*
90-132 V*
120-146 V*
180-264 V*
180-264 V*
239-293 V*

Bearing Purge

A 1/4" National Pipe Thread bearing purge port (item 6 on
Figure 3 on page 35) protects the main crankshaft
bearings in applications where large amounts of water are
being pumped. In the standard configuration, this port is
sealed.
To enable the bearing purge, dry nitrogen at a flow rate of
≈
5 lpm can be bled into the bearing purge port. This gas
supply should be maintained at 2 psig or less and must be
kept below 5 psig. See "Purge Kit" below.
The bearing purge port has
CAUTION
been disabled on TriScroll 300
model S4700308. Use of this port
could cause internal damage to
the pump.

Purge Kit

A purge kit (Varian part number PTSPURGEKIT) to
properly purge either the bearing purge or the gas ballast
is available. This kit contains a flow meter and all
necessary valving and tubing.
Use the following
Wiring Diagram
Figure 4 low voltage
Figure 4 high voltage
Figure 5 low voltage
Figure 5 low voltage
Figure 5 high voltage
Figure 5 high voltage
Figure 5 high voltage
39