This is a timer function which extends the length of time that a trip output is activated after a valid trip condition occurs. For this function to engage, a valid trip condition must exist long enough to satisfy the pre-trip timer. The length of time is programmable independently for each function.
This is a timer function which requires that a trip input be present for a certain length of time before a trip command is transmitted. The length of time is not programmable by the user, but is set at the factory to 100µs.
This is a timer function which requires that an alarm condition exists for a certain length of time before an alarm output is generated. The length of time is programmable by the user.
This is a security timer function set on the Rx Card. It requires that a trip be present for a certain length of time before an output is generated. The length of time is programmable independently for each function. Note that the setting in NMS (Network Management Software) has a propagation delay or offset of 2 ms built in.
The NMS pre-trip timer setting takes into account an approximate 2 ms of processing delay within the module and mux. For example: To cause the Pre-Trip Timer to require 3 continuous milliseconds of Receive Trip Commands before the trip command is accepted, use an NMS pre-trip timer value of 5 ms.
This module communicates using a single bi-directional DS0. The communication includes programmable addressing to prevent misconnections. One of 32 addresses are selectable.
||3 - 256 ms (1 ms increments)
|Alarm timer (delay)
||0 - 2.5 Sec. (10 ms increments)
||3 - 16 ms (1 ms increments)
|Sequence of events log
This module is capable of measuring and recording round trip delay. The measurement is run continuously and an alarm is generated if the round trip delay exceeds a user preset value. The frequency of the Ping Pong test is selectable by the user. The resolution of the test is 1 millisecond and the accuracy is 1 millisecond each way.