Description
Insulation monitoring device with integrated load and
temperature monitoring for medical IT systems in accordance with
IEC 60364-7-710, IEC 61557-8 and DIN VDE 0100-710.
Product description
The ISOMETER® of the IR427 series is designed to monitor the insulation resistance of AC circuits (medical IT systems). At the same time, the load current and temperature of the IT system transformer can be monitored.
Application
Medical IT systems in accordance with IEC 60364-7-710, IEC 61557-8 and DIN VDE 0100-710.
Function
The insulation monitoring device monitors the insulation resistance, the load current and the temperature of the IT system transformer. In addition, the connections to earth, the measuring current transformer and the temperature sensor connections are monitored. The currently measured value is indicated on the LC display. By pressing the “∧” or “∨” keys, other measured values can be displayed. Alarms are indicated on the LC display via LEDs and an additional identification. Parameters are assigned to the device via LCD or the function keys on the front of the device.
Insulation monitoring
The AMP measuring principle, also detects DC faults. When the value of the insulation resistance falls below the set response value, the alarm relay K1 switches and the alarm LED.
“AL1” lights. When the insulation resistance exceeds the release value (response value plus hysteresis), the alarm relay returns to its initial position and the alarm LED “AL1” goes out.
Load current and temperature monitoring
The load current is monitored via the measuring current transformer STW2; the temperature is monitored via a temperature (Bimetal) switch or a PTC Thermistor according to DIN 44081.
When the response value is exceeded, the alarm LED ”AL2“ lights. The required temperature sensors are already incorporated in BENDER transformers.
Alarm relays
The alarm relay switches on the occurrence of an alarm or in case of voltage failure (N/C operation). The operating principle can be changed.
