Table of Contents
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MNEMONIC
PF-L
POR-L
PWM-L
QEN-H
QUAD-H
Functional Description
7936 and 7937
Table 5-1. List of Mnemonics (12 of 23)
SIGNAL
Power
Fail
Power On
Reset
Pulse
Width
Modulation*
Transistor
Enable
Quadrature
SOURCE
~A4
~A4
~A1
~A1
IIA1
DESCRIPTION
POWER FAIL/RESET output which goes
low 2 milliseconds before any output voltage
from the power supply drops out of regula-
tion. The timing is valid only when primary
power to the supply is removed. If an output
voltage from the power supply loses regula-
tion because of a load fault or a component
failure,
PF-L
will go Iowan unspecified time
later.
PF-L
goes high 1 millisecond before
Power On Reset
POR-L.
PF-L
is connected to controller PCA-A6 via
power supply output cable W4, power dis-
tribution PCA-A5, and read/write PCA-A2.
POWER FAIL/RESET output used to reset
circuits in the drive at power on.
POR-L
goes high a minimum of 100 milliseconds af-
ter all output voltages from the power supply
are in regulation, following application of
primary power to the power supply. During
operation of the drive,
POR-L
will go low
when any output voltage from the power
supply loses regulation.
POR-L
is connected to PCAs AI, A2, and A6
via power supply output cable W4 and power
distribution PCA-A5.
PULSE WIDTH
MODULATOR
100-kHz
pulse-width-modulated square wave output.
Used in servo power amplifier.
PWM-L
can be monitored at pin 12 of the
servo test point PCA.
AMPLIFIER
CONTROL
AND
FAULT
INDICA TION
output
to
TRANSISTOR
DRIVERS and ACTUATOR CROWBAR.
QEN-H
shuts down servo power amplifier
operation when a servo fault is detected.
SERVO
CONTROLLER
output
to
DEDICATED SERVO TIMING AND PLL.
QUAD-H
causes
the
dedicated
position
demodulator to process quad dibits.
5-59
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