PCC D3400 - Page 97

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INPUT ADDRESS
EMERGENCY UNLOAD ENABLE (LEUEG)
~.
ADDRESS
I b DIFFERENCE LINES
NLADE ,.....,
NLAD7G
NLAD6G
NLAD5G
VELOCITY POLARITY
TRANSISTm
NLAD4G
FUNCTION
SELECT
SWITCH
NLAD3G
GENERATOR
NETWORK
NLAD2<?
NLAD1G
NLADOG
I
I
'-'
I
I
I
I
I VELOCITY REFERENa ENABLE (NLVREG)
FORWARD DIRECTION (LFDXO
EXTERNAL INPUT
J
1
TEST POINT
I
I
MODE CONTROL
I
CIRCUITS
POSITK>N
SERVO OFFSETS
I
I
ADJUST
CONTROL
TRACK-OFFSET PLUS (NLTOPG)
LOGIC
TItACLoJFSET
MINUS (NLTOMG)
TRACK OFFSETS
I I
FOCWARD SLOW MODE (NLFSMI)
FORWARD SLOW,
I I
REVERSE SLOW,
REVERSE SLOW MODE (NLRSMI)
REVERSE SLOW
I
I
AND
r TeMp cOMP KBA -1
HEADS RETRACTED
I
I
I
I
TEMPERA nJRE
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I
I I
I
I
I
COMPENSATION
I
I
(200 TPI)
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I
I I
L ___ -1: ____ .1
TRANSISTOR
POSITION MODE (LPMXG)
SWITCH
I I
I
I
POSITION
REFERENa CLOCK (SPRCG)
X +0 SIGNAL
POSITION QUADRATURE CLOCK (SPQCG)
ANALOG
X +90 SIGNAL
HEADS RETRACTED (SHRXG)
TO DIGITAL
CONVERTERS
HEADS RETRACTED SIGNAL
POSITION
TRANSDUCER INDEX (SPTlG) INDEX SIGNAL
I
I
I
\.
POSITION TRANSDUCER FAILURE (SPTFG)
Y
I
I
POSITION TRANSDUCER
SIGNAL CONDITIONERS
I
I
I
__ _ _ ___ ~~C~ I SERVO j>~ _
POSITIONER SERVO ANALOG CIRCUITRY
SUMMING
AMPLIFIER
I
POSITION
TRANSDUaR
AMPLIFIERS
J
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I
,
I
I
I
I
EMERGENCY UNLOAD
EMERGENCY
RE LA Y DRIVE R
UNLOAD SYSTEM
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I
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I
(
==--
POWER AMPLIFIER
...,
...,
I
EMERGENCY UNLOAD
I
RELAY
I
I
I
CURRENT SENSOR
I
I
VELOCITY
I
TRANSDUaR
I
AMPLIFIER
I
I
,
X+O
I
X +90
I
HEADS-RETRACTED
INDEX
I
I
lAMP DRIVER
I
AND LAMP
I
FAILURE DETECTOR
I
I
--- -- --- '"" - ---
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I
EMERGENCY
UNLOAD CAPACITOR
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I
I BASE ASSE~L_Y __
--
1---
--
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I
POSITIONER COIL
I
AND MOVING MASS
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I
VELOCITY
:
TRANSDUaR
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I
I
POSITION
TRANSDUaR
I
I
1
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I
I
-
-
-
-,
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I
---I
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-~
___________ J I POSITIONERASSE_M_B_LY ______ _
1718
Figure 4-2. Positioner and Positioner Electronics,
Functional Block
Diagram
4-35/4-36
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