Basic Installation and Operation Guide VMX Series Digital Solid State Soft Starters 18 – 1000A
Page 22 of 27
Function 51 Internal protection features
Several protection features in the
VMX Series
are accomplished with internal hardware and use software
switches in Function 51 to enable or disable them. The following chart shows these functions and the factory
default settings. Refer to the Advanced Installation, Operation and Programming Manual,
Section 5.6.9.a
for
details on how to change these settings.
Fn #
Function Description
Adjustment / Display Range
Setting
Increments
Factory
Setting
F075
Real Time Clock - Year
2000 - 2047
1 year
2000
F076
Real Time Clock - Month
1 - 12
1 Month
1
F077
Real Time Clock - Day
1 - 31
1 Day
1
F078
Real Time Clock - Hour
0 - 23
1 Hour
0
F079
Real Time Clock - Minute
0 - 59
1 Minute
0
F080
Real Time Clock - Second
0 - 59
1 Second
0
F081 Revision
#
-
-
Factory
Setting
F082 –
F084
Reserved for factory use
F085
thru
F097
Read Only
No settings
1
0
F085
thru
F097
Read Only
No settings
1
0
Protection
Function
Description
Default
Setting
Phase Rotation
Trip
Phase Rotation protection.
Phase rotation must match selection in Bit #2 below. Setting to Off (0) will make the VMX
insensitive for use behind a reversing contactor
On
Expected Phase
Sequence
2 = A-B-C Phase Rotation Sequence Only
0 = A-C-B Phase Rotation Sequence Only
A-B-C
Rotation
Phase Current
Loss
Phase Current Loss, any phase current reading is less than 12% of unit max amp rating after 3
seconds from Start command.
On
Shorted SCR
Lockout
At least one SCR has shorted; there is no voltage drop across the SCR phase assembly.
On
Shunt Trip
Shunt Trip of the main Circuit Breaker or Isolation Contactor (if provided and wired to an Aux.
relay in F060-F061)). 2 or more SCRs have shorted in opposing phases so current was flowing
to the motor while the VMX was in the Off state.
On
PTC Input Trip
PTC Trip function. This can be disabled so that a jumper is not required across the PTC inputs.
On
Line 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.
On
Table 7: Function 51 table of Hardware Protection Features
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