Appendix - DPP power and ground requirements 21-5
DPP Hardware Component Replacement Guide DPP001 and up
In the event of ac power failure, the system automatically switches to an
internally powered dc clock. An information message is output to the
terminal, as shown by:
>> KEY “ACR” ON AC RECV. <<
Note 1: This message is not valid for Turbo DPP systems and Non-
Turbo DPP systems equipped with 1-Gigabyte disk drives.
Whenacpowerhasbeen restored, thesystemclockcanbe manually reactivated
and set to the proper time.
Note 2: The ERRMAP entry, NO CLK TIME SET, can be set to
INHIBIT if the ac transformer option is not used.
DPP external connector wiring
Refer to Figures 21-1, 21-2, and 21-3 and Table 21-1 for DPP external
connector wiring. The table is partitioned into two categories: (1) DPP
systems with terminal block (TB) connectors, and, (2) DPP systems with D-
type connectors (D-Conn). References to the applicable figures are provided.
Grounding interface
Internal grounding of the DPP is a star-type arrangement, with battery, logic,
and frame grounds isolated from each other. Connections for each of the
grounds are indicated on the power and alarm connector panels. Refer to
Figure 21-4.
No arrangements are required for the ac ground conductors. The ac ground
for the clock is terminated at the wall transfer.
Note: The 8 KHz connector is not present on later model DPP systems;
those equipped in the EMC chassis.
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