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7
For AC-powered systems with a UPS:
a.
Connect the appropriate cable (see the following list) from connector
J4 on the system monitor in the column with CPU 0 (the master
system monitor) to the associated UPS. Table 13 gives the pin
assignments and signal descriptions for the alarm cables.
— For a Best Inc. UPS, use an NT8D46AJ alarm cable.
— For an Exide UPS, use an NT8D46AQ alarm cable.
— For an Alpha UPS, use an NT8D46AU alarm cable.
b.
Connect the cable to the UPS as specified by the manufacturer.
c.
Repeat this step for each system monitor with an associated UPS
(see Figure 68 on
Table 13
NT8D22 System Monitor – pin assignments at J4
Pin
1
2
3
4
5
6
7
8
9
Configuring the system monitor
page
168).
(Power sense; from UPS)
Large System Installation and Commissioning
Page 167 of 436
Signal description
Not used
Not used
Not used
Not used
Alarm 1
(AC fail; to UPS)
Alarm 1 return
Alarm 2
Alarm 2 return
Not used
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