N O T E: P aram set is required to configure th e program m able dry contact port.
N O T E: T o p revent signal interference above 30 and up to 150 m eters, add itional surge p rotection is
required usin g shielded cables or separate grounded conduit.
N O T E: A ll external w ire furnished by others (FBO).
N O T E: A ll wiring m ust be done in accord ance with national and local electrical codes.
N O T E: A ll input/outp u t dry contacts are norm ally open.
N O T E: C losin g the external outp u t breaker (Q E) enables the inverter. O pening the external output
breaker autom atically disables the inverter.
4.2.4 Programmable 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 voltages are
24Vdc/250Vac, and the current is 5A.
Figure 4.7 Dry con tact p orts J8
Po rt Pin N am e Default signal
1. Bypass Backfeed
J8-1 BFP_O Normally open. Closed when bypass has backfeed
J8-3 BFP_S Bypass backfeed protection relay common
J8-5 BFP_C Normally closed. Open when bypass has backfeed
3. Input Backfeed
J8-2 MFP_O Normally open. Closed when rectifier has backfeed
J8-4 MFP_S Rectifier backfeed protection relay common
J8-6 MFP_C Normally closed. Open when rectifier has backfeed
Table 4 .7 Selectable dry contact port
4 Electrical Installation
52
Vertiv™ Liebert® EXM2 UPS User Manual
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