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Functional Description
7936 and 7937
MNEMONIC
ACQUIRE-H
ACUR
AGC
AGCF-L
AMPEN-H
AMPFLT-L
5-48
SIGNAL
Acquire
Actuator
Current*
Automatic
Gain
Control
AGC Fault*
Amplifier
Enable
Amplifier
Fault*
Table 5-1. List of Mnemonics
(I
of
23)
SOURCE
ill
A1
~A1
IilIl
A2
IIA1
IIA1
~A1
DESCRIPTION
SERVO
CONTROLLER
output
to
SAMPLED
SER VO
TIMING
circuit.
ACQUIRE-H
is used to synchronize the timing
of the dedicated and sampled servo circuits.
Output of CURRENT SENSE AMPLIFIER.
Equivalent voltage is 2 volts for every 1 am-
pere of current in actuator.
ACUR
can be monitored at pin 4 of the servo
test point PCA.
AGC CIRCUIT analog output that controls
the gain of the AGC amplifier in the read
chain FILTER
and AMPLIFIER stage.
AGC INTEGRA TOR output to SERVO
CONTROLLER.
AGCF-L
is active when level
of sampled servo is too far above or below a
reference.
AGCF-L
can be monitored at pin 40 of the
servo test point PCA.
SERVO
CONTROLLER
output
to
AMPLIFIER
CONTROL
and
FAULT
INDICA TION circuit. See figure
~
. The
servo power amplifier is off when
AMPEN-H
is low and is turned on by the rising edge of
AMPEN-H
(assuming that there are no
amplifier faults.)
AMPLIFIER
CONTROL
and
FAULT
INDICA TION
output
to
SERVO
CONTROLLER. See figure
II.
AMPFL T-L
is
la tched low if an y one of the following servo
fault conditions occurs: Servo Processor Reset
SPR-L
goes low, an under voltage (+45V or
-45V) condition is detected, an overvoltage
condition is detected, or the 100-KHz clock in
the PWM fails. The fault is cleared on the
rising edge of
AMPEN-H.
AMPFL T-L
can be monitored at pin
32
of the
servo test point PCA.
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