IR420-D4-1

1 IR420-D4 Series Digital Ground Fault Monitor / Ground Detector Ungrounded (Floating) AC Systems Technical Bulletin NAE1012090 / 04.2011 BENDER Inc. 700 Fox Chase, Coatesville PA 19320 Ph: 800-356-4266 / 610-383-9200 Fax: 610-383-7100 A-ISOMETER® IR420-D4 Ground Fault Monitor / Ground Fault Relay for Ungrounded AC Systems less than 300 V Product description The A-ISOMETER® IR420-D4 monitors for ground faults in ungrounded AC systems from 0 to 300 V by measuring the system's insulation resistance. The IR420-D4 is designed to provide predictive maintenence and detect ground faults in ungrounded systems before leakage current may even be present. An external supply voltage is required to power the device. Application General purpose industrial use in AC/DC control circuits Ungrounded systems at 300 V or less A-ISOMETER® IR420 Function When the insulation resistance from system to ground falls below the set response value, the alarm relays switch and the alarm LEDs activate. Two separately adjustable alarm contacts can be set to a prewarning and main warning alarm. The measured value is indicated on the LCD display. A fault storage setting allows the device to either latch or automatically reset. TEST and RESET may be activated on the device or via a remote connection. The IR420-D4 continuously monitors the equipment ground connection to ensure proper operation. The device's easy-to-use onboard menu manages all settings via the detailed LCD display. Preset fun...