Specifications

December 2008 Page 17–17
Chapter 17. Pilot Wire Interface (HCB/SPD) Module
17
Fig. 17–20. Pilot Wire Interface Module Interface Board Component Location for Two-Terminal Lines. (1503B18)
Yes, if frequent F
AILED to Send Timestamp
Maint. Module did not receive event timestamp from HCB or PRI module
Yes Programmed Setup Mismatch
PRI or HCB module has different settings than MM
Information DTT
Key CLEARED
Returned to normal
Information DTT Keyed
HCB module DTT input asserted
Information DTT Trip Output On CLEARED
Returned to normal
Information DTT Trip Output On
HCB module receiving DTT from remote HCB
Information F
AILED to Send Event
Maint. Module did not receive event from HCB
ALARM, EVENT TEXT
,
CONCERN? EXPLANATION OF EVENT
Table 17–1. Pilot Wire Interface Modules (HCB/SPD) Alarm Events.
Some users have asked what action should be taken when experiencing different alarm conditions. The
following table is offered as a guide for this purpose.