Cortalk RMU5 Generic Installation And Configuration Manual page 43

Normal allows a report to be sent when channel has exited the alarm window. The Min Interval parameter
determines how long must pass before a second report occurs—this is used to limit communications in case of
oscillating inputs. The Max Reports Per Day field limits the number of autonomous alarm reports that can be sent
within a single day, again to limit communications traffic. The Input Debounce field sets the number of seconds a
unit is in an alarm window before it is determined to truly be in an alarm state. The "Inhbit Alarm During
Interruption" checkbox allows an alarm state to be ignored during interruption cycling. This will prevent alarms
from occurring when a rectifier is known to be interrupting.
Note that the Alarm Reporting Enable checkbox must be checked to allow alarm window monitoring via MODBUS.
Also note that the alarm timing parameters are not applicable to the Skywave communications mode.
9. Analog Input Alarms. This group of fields sets the parameters for alarming on the I/O point. The low and high
limits can be set, and whether the alarm state is between the two values, or outside the two values. This group of
fields only applies to I/O points of the analog input type.
10. Digital Input Alarm State. This field sets whether a digital input is considered to be in an alarm state if it is high
or low. This field will depend on the device being monitored. Clicking the Read button will read the current state
of the digital input. This group only applies to I/O points of the digital input type.
11. Digital Output. This grouping of fields set the parameters for a digital output I/O point. The output may be set to
static, one-shot, or toggle. A static output will maintain the output as set by the controlling device. A one-shot
output will be set to the commanded state, then revert back to the alternate state after the on time or off time field.
A toggle input will continuously toggle between on and off according to the on and off time fields.
12. MODBUS Base Register. This field defines the MODBUS slave register address for reading the current state of an
I/O point. The MODBUS slave register addresses for reading and setting the alarm limits/status are also configured
in this group.
13. Web Page Display. This checkbox determines if the currently selected I/O point will be displayed in the Web server
status page.
14. Analog Input Calibration. This group of fields and control buttons is used to calibrate an analog input I/O point.
This grouping differs from other configuration parameters in that it communicates with the RMU5 in real-time to
obtain values from the analog input channels. RMUSetup must currently have a connection to the RMU5.
Calibration factors are determined from these real-time readings. The Units field is also informational, but it is
stored in data log files.
15. Analog Input Notch Filter. The analog to digital converter section of the RMU5 includes a DSP notch filter that is
used to eliminate line frequency from DC measurements. This filter must be set to the same frequency as the line
power used on the equipment being monitored.
Calibration of voltage type analog inputs requires that the following procedure be performed:
For one of the four RMU5 internal analog inputs, set the range selection by pressing the button next to "Select
1.
Range" in the "Analog Input Calibration" group until an appropriate range is selected for the measurement
source. Low Range signals must be within +/-158mV peak. Medium range signals must be within +/-7V peak.
High range signals must be within +/-175V peak.
Fill in the Units field with a meaningful value. The Units field will typically be 'V' for volts.
2.
3. Set the Channel Offset to 0.
4. Set the Channel Scaling to 1. If an external divider network is used to feed the RMU5 inputs, enter the value
of the external divider here. For example, if a 10:1 divider is used, enter 10 in this field.
A current measurement channel is used to measure the voltage across a current shunt, which through the calibration
procedure is converted to a current measurement. A current shunt is usually specified by two values, a voltage and a
current, e.g. 50mV@20A, which means that when 50mV is measured across the shunt, 20A is flowing through the shunt.
For maximum measurement accuracy, the shunt should be in the circuit leg with the potential closest to ground.
Calibration of current type analog inputs requires the following procedure be performed:
For one of the four RMU5 internal analog inputs, set the range selection by pressing the button next to "Select
1.
Range" in the "Analog Input Calibration" group until an appropriate range is selected for the measurement
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TITLE:
RMU5 Generic Installation and Configuration Guide
DOCUMENT NO.: SHEET:
RMU5-MAN-001
REV:
43 of 69 1.10