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Functional Description
7936 and 7937
MNEMONIC
OFTRK-H
OVER
VEL-L
PACC-L
PAREN-H
PARER
PES
5-58
SIGNAL
Off track
Latched
Over
Velocity
Positive
Acceleration
Parity
Error
Enable
Parity
Error
Position
Error*
Table 5-1. List of Mnemonics (11 of 23)
SOURCE
IJA1
SIi
A1
IJA1
Ii1II
A2
IIA1
DESCRIPTION
FAULT
LATCHES
output
to
SERVO
CONTROLLER.
OFTRK-H
denotes an off-
track condition, which occurs during a nor-
mal seek. The signal is a fault when on-track
condition is desired.
Output from OVER VELOCITY DETECTOR.
OVER
VEL-L
signals
to
the
amplifier
CONTROL AND FAULT INDICATION cir-
cuit that the actuator is moving too fast.
SERVO CONTROLLER output to SEEK
CURRENT COMMAND GENERATOR. See
figure
SIi.
PACC-L
causes the servo power
amplifier to drive the actuator with +2.90
amperes.
READ/WRITE
CONTROLLER
output
which
enables
the
PARITY
ERROR
DETECTOR in the read chain.
PARITY DETECTOR output which informs
the READ/WRITE CONTROLLER that a
parity error has been detected.
SAMPLED/DEDICA TED SELECT SW out-
put.
PES
is either the dedicated or sampled
position signal, depending on whether the
servo system is presently in the dedicated
(seek) or sampled (track follow) mode of
operation.
PES
can be monitored at pin 21 of the servo
test point PCA.
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