Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
FEATURES
TRIP HOLD
RFL DS-TT RFL Electronics Inc.
January 31, 2008 2 (973) 334-3100
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.
INPUT DE-BOUNCE
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.
ALARM TIMER
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.
PRE-TRIP TIMER
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.
COMMUNICATION CHARACTERISTICS
This module communicates using a single bi-directional DS0. The communication includes
programmable addressing to prevent misconnections. One of 32 addresses are selectable.
PROGRAMMABLE LOGIC
Trip hold
Output Form
Alarm timer (delay)
Pre-trip timer
Unblocking
Sequence of events log
Operational modes
3 - 256 ms (1 ms increments)
normal/invert
0 - 2.5 Sec. (10 ms increments)
3 - 16 ms (1 ms increments)
Enable/Disable
20 records
Transfer Trip/DCB
PING PONG
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.
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