24/7 MCC Thermal Monitoring
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MCC Modbus Solution (MMS)
Situated completely within the drawer, the special thermal Sensors are attached to the incoming and outgoing cables (or busbar) at the rear of the compartment. The ability of the system to fit within the drawer / bucket is of particular advantage where this is removable. The output from the Sensors is analysed by the MCC Modbus Datacard (MMD) for two key failure modes a) failing or compromised termination/joints and b) phase imbalance.
1. MCC Modbus Datacard (MMD): The data from the Sensors is collected in the DIN rail mounted Datacard and converted to Modbus protocol for onward transmission. It connects to the MCC Sensor Loom (MSL) via a factory fitted connector. It also connects to the LED light unit (MLU) via the factory fitted connector. It requires power of 24VDC. The MMD is pre-programmed with factory default alarm & device address settings but the Client can use the DIP switches to set their own.Connection to a network is quick and easy enabling both remote alarms and pass through of raw data to client host system (e.g. BMS, SCADA) for storage, trending and further integration.
2. MCC Sensor Loom (MSL): The MSL contains 6 thermal sensors pre-labelled for connection on the incoming and outgoing cables within the drawer using the MCC Sensor Tape (MST) sensor tape supplied. The MSL has a factory fitted connector which connects the loom to the MMD.
3. MCC LED unit (MLU): Fitted to the front of the drawer the MLU show the tatus of the MMS, any alarms and locationof the fault.
MCC Modbus Aggregator (MMA): The MMA is a data aggregator and gateway for all MMDs in a single column. The MMA provides a single connection for up to 30 MMDs onto a network. MMA’s can be daisy chained together within a switchboard to form a Modbus network which can connect to client network
Temperature alarms: For the failing termination there are two alarms generated, first the low warning level thermal alarm and should the temperature continue to increase then a high or critical alarm is triggered.
These alarms are visible via a LED status light on the front of the drawer. This provides system status, alarm type and location. Remote alarms are also available through both a volt free relay contact and via Modbus 485.
Phase alarms: The Phase imbalance alarm is generated when, if connected to circuits controlling motors, there is difference in the temperature between the phases. A 10°C differential can identify a phase imbalance which, if not rectified can half the life of the motor.