Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
Note 1. Trip Hold Timer
When a user selects a value for P01 through P04 trip hold timers, it must be in
increments of 1.0 ms. In addition to this there is a negative offset of 1.0 ms. Also note
that the minimum setting of P01 through P04 is 2, for security reasons. For example, if
a user wants the Function 1 Trip Hold Timer to be = 7.0 ms, do the following: (7.0 ms)
- 1 = 6. The 6 can be entered in either decimal or binary format. Therefore set P01 = 6
for a value of 7.0 ms in decimal format, or set P01 = B0000110 for a value of 7.0 ms in
binary format. Thus enter the following SCL command:
<address>:<subaddress>:SET:P01=6;
or
<address>:<subaddress>:SET:P01=B00000110;
NOTE
The user should avoid changing settings while the module is in service, as
unintended operations may occur.
Note 2. Pretrip Timer
The pretrip timer on the MTS module provides security and determines the
approximate trip time delay based on its setting. Version 5 of the Transfer Trip ACTEL
changed from a 3-frame word to a 4-frame word, changing the increment of the trip
time. Prior versions of the MTS module with a 3-frame word had a range of 2-12 ms
for a setting range of 2-15 of the pretrip timer. Each increment was 0.75 ms.
Starting with version 5, the 4-frame word trip time range is 3-16 ms for a setting range
of 2-15 of the pretrip timer. Each increment is 1.0 ms. These times are approximate and
will vary up to 1 ms based on the exact timing of the trip input. The nominal trip time is
the approximate expected maximum for a given setting. Settings less than 2 are ignored
for security reasons and a value of 2 is used.
Version 5 of the ACTEL also supports backwards compatibility by offering a mode in
which 3-frame words are used. This mode is selected by choosing TX addresses that
are not recommended on previous versions. Addresses in which the fourth address bit is
a one, select 3-frame mode. Conversely, addresses in which the fourth address bit is a
zero, select 4-frame mode. 3-frame mode should only be employed when
communicating with units with Version 4 or earlier ACTELs.
>> Note 2 continues on next page <<
RFL DS-TT RFL Electronics Inc.
January 31, 2008 19 (973)
334-3100
To Next Page
Loading...