Instructions for AC mains voltage sensor
The AC mains voltage sensor is compatible with all current Didactum measuring and monitoring devices. This smart sensor is mounted on a DIN rail.
Typical applications of the AC mains voltage sensor for DIN rail include:
- Detection and measurement of current from 0 to 250V AC
- Detection of overloads/current fluctuations
- Monitoring of the power supply and notification in case of power failure
Scope of delivery
- The AC mains voltage sensor unit includes the following components:
- 1x AC mains voltage sensor for DIN rail
- 1x DIN clip
- 1x 2-meter RJ11 patch cable (6P4C)
Mounting the AC voltmeter on a DIN rail
Connecting the cables to the smart AC voltage detector
Important Information:
Please strictly observe all applicable regulations and safety guidelines for electrical work. Hire a qualified electrician or a certified electrician. Please also observe accident prevention regulations and all applicable occupational health and safety, operational, and safety regulations.
Connection to the SNMPv1/v2c/v3-compatible measuring device
The included RJ11 patch cable is connected to the sensor port (OUT). The other end of the cable is plugged into a free analog sensor port on the SNMPv1/v2/v3 compatible monitoring system of the 50 / 100 / 300 / 400 / 500 / 600 / 700 series. Please note that the monitoring system must be purchased separately. With the autosensing function, the DIN rail AC voltmeter is automatically detected by the IP-based monitoring system and displayed in the German-language web interface.
Sensor configuration
Log in to the Didactum Monitoring System using Google Chrome, Safari, or Mozilla Firefox. In the web interface, under "System Tree," you will find the AC alternating current sensor for DIN rail mounting under "Autodetect."
Hysteresis function of the AC voltmeter for DIN rail
All networked measurement and monitoring systems from Didactum offer a hysteresis function. This function is useful for fluctuating measurement states, such as when the sensor constantly switches between "Normal" and "Warning" states. Hysteresis helps avoid a multitude of notifications and alarm messages. A hysteresis state can be defined for various sensors. The hysteresis can be a duration or a value. The hysteresis function can also be deactivated if desired.
If a time (in seconds) is defined for the hysteresis, the Didactum intelligent sensor transitions to the new state with a delay. The timer starts counting from the moment the sensor reading leaves the current range. If the "Value" type is used in the hysteresis function, the new sensor state (Normal / Warning) is only reported by the measurement and monitoring device when the defined value has been exceeded or fallen below.
Fine-tuning of the measured values using an individual formula
Using the linear formula "y = k * x - b", the measured values can be fine-tuned as needed.
As an example, let's take a measured current of 0 to 100 A.
Here, the range is 100, so k = 100. The output voltage is, for example, 0 to 5 V. Here, the range is 5. "b" is the value that the sensor displays in the web interface when there is no current. Let's assume this is "b = + 0.21". Then we use the following formula: "100/5*(x-y)" (without quotation marks). The expression formula would be "20*(x-0.21)".
Alarm in case of overload, voltage drop or power outage
Didactum's SNMP-compatible measuring and alarm devices can monitor the power supply within critical infrastructure around the clock.
Notifications and alarms are sent via SNMP trap, email, SMS (via LTE or GSM modem), relay switching, or alarm siren. Instructions for setting up an alarm are available here. Direct remote querying of the AC voltmeter via SNMP GET command is also supported. This smart sensor provides an SNMP OID for this purpose. Additionally, the measurement data, acquired in real time, is stored in the monitoring system's data logger. A visualization function is available directly in the German-language web GUI. With a mouse click, the measurement data is loaded from the device and can be further processed for analysis and audits. Important events such as overvoltage, voltage dips, or power outages are recorded in the monitoring system's syslog.
DIN AC Sensor
