5
Service Manual
4
VNUS Radio Frequency Generator
Patient
Connections
Plastic
Metal
Figure 4: VNUS Radiofrequency Generator Grounding and Isolation Diagram
Table 1: Compliance Requirements for Isolation Barriers in Figure 4
Isolation
Type
Air Clearance
(mm)
Creepage
(mm)
Test
Voltage
A
BOP (240 VAC)
1 .6
3
1500
B
BI (240 VAC)
2 .5
4
1500
C
DI (240 VAC)
5
8
4000
D
BI (240 VAC)
2 .5
4
1500
E
DI/RI (240 VAC)
5
8
4000
F
DI/RI (130 VAC), BI (240 VAC)
5
8
4000
G
DI/RI (130 VAC), BI (240VAC)
5
8
4000
H
DI/RI (130 VAC), BI (240 VAC)
5
8
4000
I
17 .g .5 Protective Impedance, Max EARTH leakage = 0 .5mA
J
DI/RI (1000 VAC)
18
32
7000
K
DI/RI (240 VAC)
5
8
4000
L
BI (240 VAC)
1 .6
3
1500
M
Functional Only
na
na
na
N
Functional Only
na
na
na
P
DI/RI (240 VAC)
5
8
4000
Abbreviations in Table 1
Air Clearance - Shortest path in air between two conductive parts
BOP - Basic insulation between Parts of Opposite Polarity .
BI - Basic Insulation
Creepage - Shortest path along the surface of insulating material between two conductive parts
DI - Double Insulation
Functional Only - Insulation that does not perform a safety function
RI - Reinforced Insulation
Operating Assumptions for VNUS RFG2 RF Generator
• The RF Generator should be used only with a Hospital Grade power cord and plugged into only
grounded, Hospital Grade AC sources .
• Class I, Type CF, Defibrillator-Proof Applied Part.
• Plastic and Metal Enclosure.
• Service Port is not user-accessible (factory use only). Service Port is covered by a plastic cover that
can only be removed with a tool .
• Service Port is UL1950, 50VDC Normal/MAINS V in Single Fault Condition.
• Metal Enclosure is Protective Earth.
• Display has no touch screen, and sits behind protective plastic cover.
• Patient Connection is Bipolar Catheter.
• The display backlight operates off a DC to AC inverter. The input is 5 VDC and the output produces
335 V
RMS
. The starting voltage is 1200 V
RMS
and lasts for milliseconds until the bulb lights .
• Isolated Patient Connections include Device, Thermocouple, and ID Resistor.
• MMC is plastic of unknown insulation properties and is operator-accessible when device is powered.
• MMC pins are not user-accessible.
Basic Inspection and Checkout Procedure
Visual Inspection
• Inspect all external receptacle connectors for bent pins, foreign objects, damaged case and/or
improper fit .
• Inspect the AC power cord for obvious physical defects or damage.
Functional Inspection
The VNUS RF Generator, RFG2 is designed to operate over line voltage range of 100-240 VAC, 50-60Hz,
therefore no changes to the RFG2 are required when changing the mains voltage over this range . An
appropriate power cord compatible with the outlet type in your area is required .
Plug power cord into power outlet, turn on main power to Generator . (Switch is located on the rear of
unit) .
Power On Self Test
Proper execution of the Power On Self Test internally verifies that the VNUS RF Generator is ready for
operation .
Caution: The RF Generator enters Error Mode if it detects a failure during the Power On Self Test (POST)
Mode. If any error messages occur indicating that the RF Generator is not safe to use, power off the unit and
contact VNUS Customer Service.
