Schneider Electric IMD-IM400 Isolation monitor
Automation & Pneumatics > Automation > Drive Engineering
This device belongs to the Vigilohm series, which was developed for the monitoring of ungrounded power supplies (IT systems) according to the installation and product standards. According to the standards, it is recommended to equip your systems with insulation monitoring devices (IMD). This equipment is intended for monitoring large and disturbed AC, DC and ACDC systems. It measures the line insulation resistance by feeding a low frequency alternating current between the mains and the ground. The configuration is set depending on the installation. The settings are made on the front of the device, via the HMI screen or via the communication port. The settings refer to the type of network, the alarm and pre-alarm thresholds, the alarm delay from 0 to 7200 seconds, and others are available. It monitors networks up to 830VAC when connected to the neutral conductor, 480V when connected to the line and 480VDC, with up to 500microfarad. The black-and-white monitor can display the insulation resistance from 10 ohms to 10 megaohms, the capacity and temporary errors. Autotest starts automatically every 5 hours and if necessary. If the insulation resistance of the system falls below the set threshold value, i.e. if there is a ground fault, an alarm is triggered via the IMD output relay. As soon as no more faults are detected, the alarm is cleared and the alarm relay returns to its normal state. The device can be supplied from a 110VAC to 440VAC source or from a 110VDC to 440VDC source, all with a tolerance of plus or minus 15%. This product is flush-mounted, e.g. into a control cabinet door. Front-side protection class is IP5, rear-side protection class IP20 and over-voltage 300V category III. The monitoring device is equipped with an RS485 communication interface with Modbus protocol.This text is machine translated.
