Toshiba TE Series - Page 60

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1250A
51 | Page
5.6.8.a (continued) Function 51: Internal Protection Features
 Note:
To restore all settings back to the factory default, enter a value of
127. A value other than the default value of 127 indicates that one or
more functions have been changed. To determine which of the
protective functions have been changed/turned-off subtract the value
displayed from 127 and compare the result against the ‘decimal
value’ column shown in table 5.6.8.a.
Example: F051 reads a value of 109.Subtract109 from 127 and a value
of 18 remains. The value 18 does not represent a single bit value
indicating that more than one function has been changed.
Referring to Table 5.6.8.a, find the largest decimal value as shown in
the ‘decimal value’ column smaller than 18. In this case, it’s a value
of 16 (bit 4). This leaves a value of 2 (18 minus 16) which represents
bit 1 (2). So in this example a value of 109 indicates that the Shunt
Trip feature had been turned off (bit 4), and the Expected Phase
Sequence had been changed to A-C-B (bit 1).
Instead of determining the previous selection add up all values in
‘decimal value’ column of the functions to be turned off and subtract
this value from 127 and program the result into F051.
Bit
#
Fault
Display
Code
Protection
Function
Description
Default
Bit
Setting
Decimal
Value
0 ROT*
Phase
Rotation
Trip
Phase Rotation protection.
Phase rotation must match selection in Bit #2
below. Setting to Off (0) will make the TE
insensitive for use behind a reversing contactor
0 (Off) 1
1 ABC
Expected
Phase
Sequence
2 = A-B-C Phase Rotation Sequence Only
0 = A-C-B Phase Rotation Sequence Only
1
(A-B-C
Rotation)
2
2
PLa or
PLc*
Phase
Current
Loss
Phase Current Loss, any phase current reading
that is less than 12% of the CT rating after 3
seconds from Start command.
1 (On) 4
3 SS*
Shorted
SCR
At least one SCR is shorted; There is no voltage
drop across the SCR phase assembly.
1 (On) 8
4 ST*
Shunt
Trip
Shunt Trip of the main Circuit Breaker or Isolation
Contactor (if provided and wired to an Aux. relay
in F060-F061). Two or more SCRs have shorted
in opposing phases so current is flowing to the
motor while the TE was in the Off state.
1 (On) 16
5 PTc*
PTC Input
Trip
PTC Trip function. This can be disabled so that a
jumper is not required across the PTC inputs.
1 (On) 32
6
PLd or
n3Ph
Line Phase
Loss Trip
Protection against loss of input line voltage.
Disable when using an In-Line Isolation Contactor
or any other system that normally removes line
power from the starter. Resets automatically when
line voltage returns.
1 (On)
64
7 --- Reserved Reserved for factory use 0 (Off) 128
* = Operating Mode designation. See Fault Code List for description.
Table 5.6.8.a: Function 51 table of Hardware Protection Features
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