54 M O T O R CO N T R O L A N D P R OT E C TI O N U N I T M 10 X US ER G U I D E
Function Enable/Disable
Setting range 0=Disable 1=Enable
Default value Disabled
Step value 1
Trip Reset Mode
Setting range 2=Local 3=Remote 4=Remote&Local
Default value 4
Step value 1
—
the phase sequence of current. The definition of
correct phase sequence:
• Voltage: L1, L2, L3
• Current: la, lb, lc
If enable phase sequence protection, when M10x
detects the voltage or current is different from
the definition M10x will release a phase sequence
trip signal.
''
Phase Sequence
M10x protects the motor against connection in
wrong phase sequence. Before motor startup,
M10x detects the phase sequence of voltage con-
tinuously and after startup M10x will detect
Undervoltage protection (M102 Only)
M102 protects the motor against undervoltage
conditions such as voltage dip.
The undervoltage protection function uses ULmin
as the criterion. There are other parameters to be
determined, such as alarm level, trip level and trip
delay, and reset voltage level. The protection
characteristic is as follows:
The lowest measured main line voltage (Ulmin) is
compared against the undervoltage alarm level.
When Ulmin decreases below the undervoltage
alarm level, an undervoltage alarm is issued.
The lowest measured main line voltage (Ulmin) is
compared against the undervoltage trip level and
voltage restore level. When Ulmin recovers above
undervoltage restore level before trip delay
expires and motor continues running. If Ulmin
remains below the restore level at a time longer
than trip delay, undervoltage trip is issued and
contactor will be opened.
When autorestart function is active,
undervoltage trip delay time is no
longer required to be configured as it is
the same as the setting value of maxi-
mum power down time.
If “main switch” is detected on ‘pow-
ered off’ position, undervoltage
alarm/tip function is suppressed to
avoid unnecessary annunciation
while the voltage measurement is still
active.
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