Toshiba 18 - 1250 A Instruction Manual page 58

TE Series Digital Solid State Soft Starters 18 – 1250A
Phase Rotation Protection:
The TE Series is set up to monitor an expected Phase Rotation and trip
if it changes. Control of this is divided into two categories: On-Off and
Expected Sequence. The default setting is On, with and Expected
Sequence of A-B-C rotation.
The ability to turn this feature ON or OFF is useful in applications where
the TE Series starter is going to be used downstream from an existing
reversing contactor / starter, or to avoid conflicts with other protection
devices.
Rotation Trip On-Off Control Numeric value = 1.
If this feature is On (default setting) and you want to turn it Off,
Subtract 1 from F051
If this feature is Off and you want to turn it On, add 1 to F051
When set to On, a trip will occur when the Expected Sequence (see
below) is wrong.
On large motors where large multiple conductors are used, it may be
easier to change the Expected Sequence in the TE Series starter rather
than swap the conductors.
Expected Phase Rotation Sequence Numeric Value = 2
If A-B-C rotation is the expected sequence (default setting) and you
want it to be A-C-B, subtract 2 from F051
If A-C-B rotation is the expected sequence and you want it to be
A-B-C, add 2 to F051
If Rotation Trip is set to Off (see above), this setting is ignored.
Phase Current Loss (Running) Protection:
This feature will cause a Trip if current in any phase (or all 3) is less
than 20% of the unit maximum amp rating after 3 seconds from a Start
Command (note that this is based on the Max Amp rating and not the
programmed FLA). Turn it to OFF if the motor no-load current is
exceptionally low such as in high inertia machines, or if you are testing
a large starter with a small motor.
Phase Loss (Running) Protection Numeric Value = 4
If this feature is On (default setting) and you want to turn it Off,
Subtract 4 from F051
If this feature is Off and you want to turn it On, add 4 to F051
Shorted SCR Lockout protection:
This feature will cause a Lockout if at least one SCR is shorted, based
on the expected voltage drop across the SCR assembly when the unit is
OFF (a shorted SCR cannot be detected while the unit is running or in
Bypass mode). If someone who understands the ramifications of having
a shorted SCR issue requires an emergency restart, this feature can be
turned to OFF. This is not the same as a Shunt Trip circuit (see below).
This is a lockout of the NEXT start command.
Shorted SCR Lockout Numeric Value = 8
If this feature is On (default setting) and you want to turn it Off,
Subtract 8 from F051
If this feature is Off and you want to turn it On, add 8 to F051
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