BENDER ISOMETER ® Iso685 series

EDS configuration: Scan EDS channel → Activate target channel → Set group parameters (CT type, response value, etc.);

Functional testing: Simulate insulation faults through grounding resistance to verify the accuracy of alarm triggering and fault location;

Operation monitoring: Check the standard display (insulation resistance+signal quality) and trace the data through isoGraph or historical memory.

（2） Alarm and fault handling

Alarm type triggering condition processing method

ALARM1 insulation resistance<Ran1 (default 40 k Ω) Observe the system status and troubleshoot if necessary

ALARM2 insulation resistance<Ran2 (default 10 k Ω), initiate EDS positioning, eliminate the fault, and reset

Check L1/+~L3/- wiring and PE connection for disconnection of faulty circuit or poor grounding of PE

EDS channel malfunction CT connection abnormality or channel not activated Rescan channel, check CT wiring

Maintenance and safety regulations

（1） Daily maintenance

No need for regular oil changes (sealed gearbox), if the cover is opened for maintenance, Mobil needs to be added ®  634 synthetic oil;

Regularly check the BS bus terminal resistance (120 Ω) to ensure stable communication;

Clean the display panel and terminals, ensure clear labeling and stickers, and replace worn parts in a timely manner.

（2） Safety regulations

Only professional personnel are allowed to install and debug. Before operation, the power must be turned off and the system must be confirmed to be out of power;

Power supply requires connection to a 24-240 V GFCI protection circuit, and modification of plugs/cables is prohibited;

When locating faults, avoid positioning current interference with sensitive components (such as PLC), and match the system tolerance value;

Only one device is allowed to actively measure in the coupled IT system, and the rest are isolated through ISOnet or digital input.

Ordering information and accessories

Product Model Description Product Number

Iso685-D-P with display/buttons, standard B91067030

Iso685W-D-P with display/buttons, W enhanced B91067030W

Iso685-S-P+FP200 without display+panel, standard type B91067230

EDS440-L-4 Insulation Fault Locator (2~10 mA) B91080202

EDS441-S-1 Insulation Fault Locator (0.2~1 mA) B91080204

Mechanical accessory terminal cover+installation clip B91067903