The right solution for each application - New variants of the iso685 family


With the ground-fault monitoring device iso685-D Bender are counting on an innovative series of ground-fault monitoring devices, that are state-of-the-art when it comes to reliability, measurement techniques, operability, and design. In addition to the core function, the possibility to continually monitor insulation of a network against ground, the new variants of the iso685 Family offer many additional features that can help to increase the safety level and save costs.

All variants feature a commissioning wizard, as well as a voltage, frequency and capacitance measurements. Furthermore, all have a permanent coupling monitoring, a buffered real-time clock with history memory and measurement profiles for different applications and the isoGraph for representation of the insulation resistance over time. Using digital inputs and outputs there are several ways of controlling the iso685 and to report errors. In addition, the devices feature an integrated web server and a Modbus TCP interface. Since the operating concept of all variants of the iso685 product family is the same, the effort required for device training is greatly reduced.

As a result of the measuring procedure several ground-fault monitoring devices can interfere with each other, and in accordance with IEC 61557-8 in an ungrounded system (IT system) only one ground-fault monitoring device is allowed to be present. There are applications where redundant systems each with an ground-fault monitoring device are operated to 80% separately. If these systems are now connected together with a coupling switch then there are several ground-fault monitoring devices in one floating system. The variantiso685-D-B is suitable for this application. This allows several ground-fault monitoring devices to be used in a coupled system, without being influenced by closed coupling switches. Bender names the function ISOnet.

All variants iso685-S… + FP200 are with identical characteristics and are deliverable without an integrated display in combination with an extra display for the assembly in control cabinet doors. Two different installation variants allow a flexible integration of the devices into the front of a control cabinet.