Vertiv Liebert APM Plus - Dry Contact Port J8

4.2.4 Dry Contact Port J8
The dry contact port J8 is shown in Figure 4.7 below and described in Table 4.7 below. The dry contact can bear voltage up to
24 Vdc or 250 Vac, and the largest current flowing is 5 A.
Figure 4.7 D ry contact port J8
Port Pin Default sig nal
1. Bypass Backfeed
J8-1 Normally open. Closed when bypass has backfeed
J8-3 Bypass backfeed protection relay common
J8-5 Normally closed. Open when bypass has backfeed
2. Input Backfeed
J8-2 Normally open. Closed when rectifier has backfeed
J8-4 Rectifier backfeed protection relay common
J8-6 Normally closed. Open when rectifier has backfeed
Table 4.7 D escription of dry contact port J8
4 Electrical Installation
42
Vertiv™ Liebert® APM Plus User Manual