Vertiv™ | Liebert® LDMF™ Distribution Monitoring User Manual | 9
3.7 PM4 Adapter Board
• The PM4 Adapter Board (PAB) is provided with each Liebert LDMF. The PAB is typically mounted on the
back of the display, which is located on the front door of the unit. The PAB provides a customer interface to
the LDMF summary alarm contacts.
• If two Liebert LDMF systems are provided, the two PABs are connected to each other at the factory. It is
only necessary to connect to one PAB to monitor the Customer Summary Alarm; the two Liebert LDMF
units share summary alarm contacts.
• On the Liebert FPC and Liebert PPC the PAB has additional connections on TB1 that include Remote
Emergency Power Off (EPO). The field-selectable switch S1 on the PAB allows the selection for either
Manual or Auto restart. The factory default setting is Manual.
• Manual restart allows for an orderly supervised startup after power failure. The control circuit
automatically energizes the shunt trip mechanism of the main input breaker upon sensing output voltage
failure.
• Setting the switch to Auto deactivates the manual restart. In Auto restart mode, the main input breaker
does not trip due to power failure and the unit will restart when power is restored.
NOTE
The TB1 connections for customer alarms 1 - 5 are used only with the VPMP product.
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