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CHAPTER 6: SETPOINTS
VOLTAGE INPUTS
V
V
< 70%
(
)
a
ab
V
V
< 70%
(
)
b
bc
V
V
< 70%
(
)
c
ca
VOLTAGE INPUTS
V
(
V
)
> 85%
a
ab
V
V
> 85%
(
)
b
bc
V
V
> 85%
(
)
c
ca
SETTING
Fuse Fail Function
= Disabled
= Alarm
= Trip
MOTOR STATUS
Running
KEYPAD RESET
INPUTS
Emergency Restart Input
Lockout Reset Input
Reset Input
SETTINGS
S4 CONTROLS
Emergency Restart
Off = 0
Lockout Reset
Off = 0
Reset
Off = 0
NOTE: The VTFF uses phase to neutral voltages
phase-phase voltages
339 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
Figure 6-57: Fuse Fail Protection logic diagram
OR
AND
OR
AND
AND
V
,
V
and
a
b
,
and
V
when "Delta" type is selected comparators.
V
V
ca
ab
bc
1 s
0
AND
V
when "Wye" VT type is selected under Voltage Sensing/VT connection setpoint, and uses
c
LOGIC OPERAND
Fuse Fail
LOGIC OPERAND
AND
Fuse Fail Alarm OP
Any Alarm OP
TARGET MESSAGE
Fuse Fail Alarm
State: Operate
Fuse Fail Trip
State: Operate
AND
S
LOGIC OPERAND
LATCH
Fuse Fail Trip OP
Any Trip OP
R
Set Dominant
LOGIC OPERAND
Fuse Fail Inhibit
AND
Any Start Inhibit
OR
896837A1.cdr
S4 CONTROLS
6–141
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