The ETX-1630x uses a Bender iso685 isolation monitor to monitor the isolation of the high-power supply output. The isolation monitoring system only monitors the isolation from ground of the high-power supply output; it does not ensure isolation of any other subsystem.

The isolation monitor also controls two mechanical relays that are exposed on J1 as show in J1 Pinout: Adapter Control and Communication. The names of the ISO pins in rows 32 – 34 refer to pins on the isometer output relays as described in the ISOMETER iso685 manual.

In addition to exposing the output relays on the mass interconnect, the isolation monitor controls the Isolation Interlock.

You can configure alarm levels and relay output conditions as needed for your application, but you must not change the value of the settings marked not user configurable in the following table. Changes to these values may disrupt normal operation of the test system, including how the Maintenance Software tests connections and Isolation Interlock function.

Table 31. iso685 Default Configuration within ETX-1630x
Setting Default Value User Configurable Notes
Insulation Alarm 1 450 kΩ Yes 300 Ω per volt based on maximum output voltage of the high-power supply.
Insulation Alarm 2 150 kΩ Yes 100 Ω per volt based on maximum output voltage of the high power supply.
Output Digital 2 Mode Active No Required for proper isolation interlock functionality.
Output Digital 2 Function 1 Ins. Alarm 1 No Required for proper isolation interlock functionality.
Output Digital 2 Function 2 Device Fault No Required for proper isolation interlock functionality.
Output Digital 2 Function 3 — Yes Use this option to configure additional triggers for opening the isolation interlock.
Output Digital 2 Test On No Required for continuity test of interlocks.
Output Relay 1 Relay Mode N/C Yes —
Output Relay 1 Test On No Required for continuity test of Relay 1.
Output Relay 1 Function 1 Ins. Alarm 1 Yes —
Output Relay 2 Relay Mode N/C Yes —
Output Relay 2 Test On No Required for continuity test of Relay 2.
Output Relay 2 Function 1 Ins. Alarm 2 Yes —
Profile Power Circuits No —
Coupling Device AGH150-4 No —
System Type 3AC No The isolation monitor automatically sets this value when used with a coupling device; it must not be changed.

Refer to the ISOMETER iso685 manual for information about isolation monitor functionality and configuration.