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5-2 Accessory Troubleshooting
TP-5672 11/95
Optional Accessories
Three-Phase Emergency Source Sensing Accessory, DD-05-K
The three-phase emergency source sensing accessory
DD-05-K provides source monitoring for the emergency
source.
The accessory includes over/undervoltage
sensing for all three phases of the emergency source.
Refer to Figure 5-2 for the troubleshooting flowchart.
Yes
Yes
Yes
Yes
No
No
No
No
Yes
No
No
Yes
No
Yes
In Index 7 of the microprocessor
menu is three-phase emergency
source sensing enabled?
Enable three-phase sensing in
index 7. See TP-5664 for
programming information
In Index 11 of the microprocessor
menu is phase sequence enabled?
Refer to shunt-jumpered control
options troubleshooting.
Is there emergency source line-to-line voltage between
terminals EA and EB, EA and EC, and EB and EC on the
three-phase sensing accessory circuit board? See
Figure 5-3 for location of circuit board)
Remove the ribbon cable between plug P15 on
the three-phase accessory circuit board and
P14 on the power supply board. Is there 1/25 of
the emergency source line-to-line voltage
between pins 6 and 7 of plug P15?
Is there emergency source
line-to-line voltage between
EA and EB, EA and EC, and
EB and EC at terminals EA,
EB, and EC on TB-AC1?
Replace the leads from
TB-AC1 to the three-phase
accessory circuit board.
The emergency source
is not available.
Is there 1/25 of the emergency source
line-to-line voltage between pins 6 and
8 of plug P15?
Replace the three-phase
accessory circuit board.
Replace the three-phase
accessory circuit board.
Check the ribbon cable for bent or broken pins and for
continuity between connectors. Is the ribbon cable
free of defects?
Refer to Power Supply to Main
Logic Board troubleshooting.
Replace the ribbon cable between
P15 on the three-phase accessory
circuit board and P14 on the power
supply board.
Figure 5-2. Troubleshooting— Controller will not sense three-phase emergency voltage