Siemens MJ-5 - Voltage Limit Control (VLC) and Data Logging; Voltage Limit Control Configuration; <LOG SETUP> Menu for Data Logging

4 Setting Up the MJ-5 Control Panel
Siemens Industry, Inc. 28
90% · AutoVRCn% · (rated current).
Example 1
AutoVRC1%I = 60%; AutoVRCset1 = 3%.
I turn-off threshold = lower of:
60% · (1-2 · (3%)) · rated current = 56.4% · rated current
or
90% · (60%) · rated current = 54% · rated current
Auto VRC will remain active until load current drops to
54% of rated current.
Example 2
AutoVRC1%I = 80%; AutoVRCset1 = 7%.
I turn-off threshold = lower of:
80% · (1-2 · (7%)) · rated current = 68.8% · rated current
or
90% · (80%) · rated current = 72% · rated current
Auto VRC will remain active until load current drops to
68.8% of rated current.
To choose Automatic mode VRC, view VRC Mode and
select AUT/REM. Use AutoVRCset1 and AutoVRCset2 to
specify the reduction amount. Use AutoVRC 1 %I and
AutoVRC 2 %I to specify the low current threshold.
AutoVRC settings are overridden by contact closures on
terminal block contacts VRC1 and VRC2.
4.4.4 Voltage Limit Control
Voltage Limit Control (VLC) defines limits for load
voltage. When VLC is active, the microprocessor compares
load voltage with VLC set points. If load voltage changes
to a value above VLC Upper, or below VLC Lower,
limiting occurs immediately —that is, without waiting for
the Time Delay timer to count down. The appropriate LED
indicator (VLC Upper/VLC Lower) illuminates to alert the
operator that Voltage Limiting is in effect.
• To activate/deactivate VLC, view VLC Enable; then use
ON or OFF.
• To set the Upper VLC set point, view VLC Upper; then
enter a value between 106.0 and 134.0 volts.
• To set the Lower VLC set point, view VLC Lower; then
enter a value between 106.0 and 134.0 volts.
Note that the upper and lower limits must not overlap. For
example, if VLC Lower is 115, VLC Upper cannot be
changed to a value less than 115 V.
4.5 Activating Data Logging—
The <LOG SETUP> Menu
The MJ-5 Control Panel can record status information that
will help reconstruct past occurrences. Two logs are
maintained: an Event Log, and an Interval Log. Event Log
records are stored when predefined Events occur; Interval
Log records are stored at predefined time intervals. See
Table 4.6; default settings are in bold.
This section describes how to define your logging
requirements. See Chapter 5, Reading and Interpreting MJ-
5 Control Panel Data, for guidance on how to retrieve
logged data.
Table 4.6: The <LOG SETUP> Menu
DATA
ITEM
DESCRIPTION
VALID
INPUTS
Log Event
Enable event Logging
ON or OFF
Event= Tap
Define Tap Change as event
ON or OFF
Event=Neut
Define Tap at Neutral as
event
ON or OFF
Event = NNR
Define Tap raise to step NN
as event
ON or OFF
NN=16
Event = NNL
Define Tap lower to step
NN as event
ON or OFF NN
=16
Event = VLC
Define VLC activation as
event
ON or OFF
Event = VRC
Define VRC as event
ON or OFF
Event = PwrFlow
Define Power Flow
reversal as event
ON or OFF
Event = PwrCyc
Define System power up as
event
ON or OFF
Event = Cfg
Define configuration
change as event
ON or OFF
Event = Alert
Define any Alert activation
as event
ON or OFF
Clr Event Log?
Clear All Event Data
Y or N
Clr IntervLog?
Clear All Interval Data
Y or N
Log Interval
Enable Interval Logging
ON or OFF
ResLogMinMax
Reset Min/Max values at
start of interval
ON or OFF
Log min/max
Panel will log
Instantaneous or Demand
Min/Max values
Inst. Dmd
Interval
Logging Interval
NNhrNNmin
Save Logs
Downloads logs to SD card
Yes or No
Uploadconfig
Upload configuration file
through SD card
Yes or No
Upload HMI
Upload system update file
through SD card
Yes or No
Upload Meter
Upload meter update file
through SD card
Yes or No
Save Config
Save the Full Configuration
of Control Panel through
SD Card
Yes or No
Restore Config
Restores the Configuration
of Control Panel through
SD Card
Yes or No
Auto Save Log
Save Logs at specified
intervals through SD card
Yes or No
Auto Save Time
Time Intervals when Logs
will be saved through Auto
Save Log
NNN in Hours