NTI E-ACLM-V/-P AC LINE MONITOR
2
INTRODUCTION
E-ACLM-V-V2
The E-ACLM-V-V2 (ACLM-V) is a sensor for the E-16D/5D/2D systems (ENVIROMUX) capable of monitoring AC line input
voltages and frequencies between 50~250V AC and 47~63Hz from two separate AC lines. It will report the current RMS AC
Voltage and AC Frequency (Hertz) to the E-xD. The ACLM-V will also monitor the number of short term Swells
1
and Sags
2
as well
as the number of Spikes
3
.
The ACLM-V utilizes two UL certified IEC 320 C14 inlets to connect to the AC lines being monitored. The ACLM-V
connects to the ENVIROMUX through up to 1,000 ft of CAT5/5e/6 cable. Data is transmitted to and from the ENVIROMUX using
the RS485 protocol.
Features & Functions:
12 bit ADC resolution, 1% full scale ADC accuracy
Measure AC Voltage (
±1%FS at 32°F to 104°F (0°C to 40°C))
Measure AC Frequency (@1% accuracy)
Monitors swells, sags, and spike events
Auto-Configured upon connection with E-xD
RJ45 Status LED’s for operating status
User selectable data interpolation options
Measuring the AC Voltage, AC Frequency; Determining Swells, and Sags:
The ACLM-V provides constant monitoring of the AC line with an active sampling rate of 12,000 samples per second.
The measurement data is transmitted to the ENVIROMUX once every second. Each time data is sent, the ACLM-V will report the
current AC line voltage and frequency, as well as the number of sags, swells, and spikes that have occurred since the last data
transmission.
After the ACLM-V has transmitted data to the ENVIROMUX (once every second), any stored values in the ACLM-V will
be erased as new data is acquired.
If a swell, sag, or spike event lasts longer than 1 second (5 seconds, for example) it will be counted as multiple events
by the ENVIROMUX because the ENVIROMUX will reset the data record to 0 each time the ACLM-V reports the data to the
ENVIROMUX. The count displayed on the screen will be updated based on the configured Refresh Rate.
Measuring Spikes:
The ACLM-V is also capable of recording the number of Spike events with a peak greater than 50V, 250V, 500V, or 1KV
as configured by the user. For example, if the spike threshold is set at 500V and the sensor records a voltage exceeding 500V
for at least 5 microseconds, the ENVIROMUX will report a spike above 500V.
The User Interface:
From the Web Interface of the ENVIROMUX, the ACLM-V sensor can be customized and monitored. The user can
modify all of the typical sensor attributes (description, group, sampling, etc.), as well as define the maximum and minimum critical
threshold values for AC voltage, AC frequency and the threshold for spike measurement. The user may also configure the
ENVIROMUX to send alerts based on the voltage or frequency level.
The sensor page for the ACLM-V will display the AC line voltage and frequency from the most recent data transmission,
as well as running totals for the number of swells, sags, and spike events that have occurred. It will also display the date and time
from which the ENVIROMUX began the running totals. A “Clear” button, when clicked, will erase the running totals and update the
date and time. The data displayed by the ENVIROMUX can be refreshed, at most, once per second. (The display may be
refreshed less frequently dependent upon the user settings (“Refresh Rate”)).
Note: As a result of the data transmission of the ACLM-V (once per second) and the browser refresh rate of the
ENVIROMUX (up to once per second), the ACLM-V will report Sags or Swells on the AC line that may not be reflected in
the numeric voltage display.
1
Swells are defined as an AC voltage exceeding the user specified maximum critical threshold for a period of 5 cycles (i.e. 5/60
th
second for 60Hz) to 1 second’s time.
2
Sags are defined as an AC voltage exceeding the user specified minimum critical threshold for a period of 5 cycles (i.e. 5/60
th
second for 60Hz) to 1 second's time.
3
Spikes are defined as a sudden high peak event lasting at least 5 microseconds that raises the voltage in either a positive or
negative direction.
