USER GUIDE |
EAGLE TWO+
Version: 3.3
75
5.
Monopolar Handswitch Decode
:
Handswitch decode circuitry works on floating principle. IC
U17 & U18 is used for detecting the activation request if any. This circuitry is powered by
isolated power supply separated for each channel. Activation requests pass on to activate
request generator.
6.
Activation Request Generator
:
This circuit keeps watch on activation request from foot or
hand controlled accessories. IC U16 generates the necessary signals for CPU to start the
process for RF delivery depending on the selected mode & the channel.
7.
Thermal fan control circuit:
This circuit keeps watch on internal temperature in unit. This
makes the cooling fan on & off depending on the internal temperature .If the temperature
raised beyond limit; it gives the Hi- temperature alarm signal to CPU, with error code and
stops RF power delivery.
8.
PREM Circuit
:
Patient Return Electrode Monitoring circuit consists of IC‟s U05 to U06 and
series transformer T04. Contact quality resistance is reflected in the form of voltage, which is
sensed by CPU. Sensing frequency is around 80 KHz & tuning can be done by adjusting preset
RP01.
9.
Leakage sense circuit:
Current flows from active electrode and return electrode is measured if
difference crosses the safety limit circuit gives error voltage. The CPU as IF- sense senses this.
CPU takes corrective action to reduce the current in safe limit.
10.
RF current sense:
Actual RF o/p current is sensed by current sense T08, T11 and IC U07 &
U08 converts the current in average value, which is sensed by CPU as I- sense.
11.
RF voltage sense
:
O/P voltage is sensed by voltage sense T07, T10 and processed by true rms
converter in dc voltage by IC‟s U09 & U10, which is sensed by CPU as V- sense. Also it gives
the signal to spark controller.
12.
High voltage sense circuit
:
This circuit continuously monitors that RF HV is not crossing the
limit. This senses the voltages in primary side of RF and converts in dc by True RMS detector
of U13 & U14. CPU sense this as HV senses signal.
13.
Spark control circuit:
When accessory is moved from high load to lighter load, it generates
very high sparks. This condition is not detectable by the CPU. External hardware checks the
sparking condition & apply damping network in primary RF circuit. This drastically improves
the performance of the system in this transitional condition.
Footswitch and Audio Board:
Is divided in three sections:
Isolated footswitch decode logic
: This circuit checks the footswitch activation input with isolated
supply hence provides maximum safety to user. Q01 & T01 produce necessary isolated voltages
and U01 to U06 detect activation input & gives the input signal to CPU Board for activation of RF
output.
Audio circuit
: Circuit generates different audio tones for cut, coag and bipolar activation. It gives
two pulse outputs for ERROR conditions. Audio oscillator & driver stage comprises of U07 to
U09. Signals are fed to speaker SPK 01 & audio volume can be controlled by control knob Kp01.
Argon Handshake circuit
: This circuit of IC U07 & Q2 shares system ready status with Argon
delivery can be immediately stopped if ESU gives Error signal.
Summary of Contents for EAGLE TWO PLUS
Page 1: ...EAGLE TWO PLUS INSTRUCTION SERVICE MANUAL ...
Page 38: ...USER GUIDE EAGLE TWO Version 3 3 37 ...
Page 39: ...USER GUIDE EAGLE TWO Version 3 3 38 ...
Page 40: ...USER GUIDE EAGLE TWO Version 3 3 39 ...
Page 56: ...USER GUIDE EAGLE TWO Version 3 3 Whittemore Enterprises Inc 55 STEP 5 STEP 8 STEP 6 STEP 7 ...
