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If it is necessary to have all the supplies come up simultaneously after a system shutdown, follow this procedure:
a. First bring the INHIBITREMOTE line low.
b. Provide a negative-going pulse to the RESETREMOTE .
c. After at least one second, return INHIBITREMOTE to a high level.
Figure A-10. System Shutdown Using Bias Supply Output
Figure A-10 shows a second method of system shutdown. This method is appropriate in systems which are not
controller-operated and in which more than four supplies must be shutdown simultaneously. Because each supply
derives its CONTROL ISOLATOR BIAS from the previous supply's + 5V REG, there is no limit to the number of
supplies that can be shutdown. Each supply must be reset individually.
Using either method of system shutdown, PCLR inhibits the EOVERVOLTAG indicator from going low and
shutting down succeeding supplies upon initial sum-on. After the supplies have stabilized, PCLR returns to a high
state.
Bias Supplies
The outputs of three current-limited bias supplies are available for user-supplied circuitry. These are + 15V @
75mA at J3-4, -15V @ 75mA at J3-20, and +5 V @ 100mA at J3-23; all with respect to J3-7, L Common.
It may be desirable to install noise-suppression capacitors on the bias supply outputs near the load circuits. The
capacitors should be ceramic or tantalum type, approximately 0.1µF to 10µF.
Maintenance
The following paragraphs provide procedures and setups to aid in checking and troubleshooting the 002 Option
Board. This information, used in conjunction with the schematic drawing and the Operation section of this
Appendix, will help in the isolation and repair of faulty circuits.
When testing the option, use of the test connector on page 95 will allow easier access to the J3 contacts.