Reference Manual

PMAC-Mini PCI Hardware Reference Manual
Hardware Setup 5
Power Supply Configuration Jumpers
(12-24V) A+V (pin 9)
J9 (JEQU)
Input
Flags
AENAs
(EQUs)
V/F DACs
+12V
+5V
-12V
GND
P1 (Bus) / TB1
E90
E85
E100
E89
3
1
1
3
E87
E88
JMACH1
A+15V
+5V
AGND
GND
A-15V
AGND
E85, E87, E88: Analog Circuit Isolation Control – These jumpers control whether the analog circuitry
on the PMAC is isolated from the digital circuitry, or electrically tied to it. In the default configuration,
these jumpers are off, keeping the circuits isolated from each other (provided separate isolated supplies
are used).
E89-E90: Input Flag Supply Control – If E90 connects pins 1 and 2 and E89 is on, the input flags
(+LIMn, -LIMn, HMFLn, and FAULTn) are supplied from the analog A+15V supply, which can be
isolated from the digital circuitry. If E90 connects pins 1 and 2 and E89 is off, the input flags are
supplied from a separate A+V supply brought in on pin 13 of the J8 JAUX connector. This supply can be
in the +12V to +24V range and can be kept isolated from the digital circuitry. If E90 connects pins 2 and
3, the input flags are supplied from the digital +12V supply and isolation from the digital circuitry is
defeated.
E100: AENA/EQU Supply Control – If E100 connects pins 1 and 2, the circuits related to the AENAn,
EQUn and FAULTn signals will be supplied from the analog A+15V supply which can be isolated from
the digital circuitry. If E100 connects pins 2 and 3, the circuits will be supplied from a separate A+V
supply brought in on pin 13 of the J8 JAUX connector. This supply can be in the +12V to +24V range
and can be kept isolated from the digital circuitry.
Clock Configuration Jumpers
E3-E6: Servo Clock Frequency Control – The jumpers E3 – E6 determine the servo-clock frequency
by controlling how many times it is divided down from the phase-frequency. The default setting of E3
and E4 off, E5 and E6 on divides the phase-clock frequency by 4, creating a 2.25 kHz servo-clock
frequency. This setting is seldom changed.
E29-E33A: Phase Clock Frequency Control – Only one of the jumpers E29 – E33A which select the
phase-clock frequency may be on in any configuration. The default setting of E31 on which selects a 9
kHz phase-clock frequency, is seldom changed.