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Page of SY31-0244-2
Revised July 6, 1971
By TNL: SN31-0327
Section 2. Features
5.9
-4
VOLT ADD-ON REGULATOR
·4 Volt Regulator, Overcurrent and Overvoltsge
When installing features or feature prerequisites on the A·
gate, the overcurrent on the -4V regulator must be ad·
justed to a minimum of 15 percent over nominal load.
Caution
Check the overcurrent adjustment whenever replacing
a -4V regulator card.
To adjust:
1.
Increase the overcurrent adjustment until the system
can be powered up.
2.
Adjust overcurrent for the -4V power supply (5.4.1).
3.
Adjust voltage for the -4V power supply (5.4.2).
5.10
B-GATE -4 VOLT LOGIC SUPPLY 12
5.10.1 Overcurrent Adjustment
5.10.1.1 For Regulator Card Part
5808959
(See Figure
5-4
for Identification)
Caution
Check the overcurrent adjustment whenever replacing
a -4V regulator card.
1.
Note:
The top screw on the upper laminar bus
is
position 10.
Connect the meter across the -4V load between
position 6 and ground (position 7) on 8-gate upper
laminar bus.
2.
Set the voltage adjustment potentiometer (Figure
5-4) to -4 .6V. Do not go beyond this.
5-8
3.
Tum the overcurrent potentiometer (Figure 5-4)
counterclockwise
until the regulator trips to cause a
power down. If you cannot reach -4.6V before the
regulator trips, tum the overcurrent adjustment
clockwise until you can just reach -4.6V before the
regulator trips.
4.
Tum the voltage adjustment potentiometer down
until the machine can be powered up. Now the over-
current adjustment is set.
S.
Adjust the voltage adjustment potentiometer (5.10.2).
5.1a 1.2
For Regulator Card Part
5860519
(See Figure
5-4 for Identification)
No
adjustment
for
overcurrent protection is necessary.
5.10.2 Voltage Adjustment
1.
Note:
The top screw on the upper laminar bus is
position 10.
Connect the meter across the -4V load between
position 6 and ground (position 7) on B-gate upper
laminar bus.
2.
Set the voltage adjustment potentiometer (Figure
5-4)
to -4.0SV.
5.10.3 Overvoltage Adjustment
There is no field adjustment for overvoltage. It is set and
sealed at the time of manufacture. Replace regulator card
if overvoltage condition fails to trip regulator.
(Be
sure to
check the overcurrent adjustment.)
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