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- The SA380TX can monitor 1 x Bender type IRDH265 / 365 insulation monitor.
- In addition to the isometer, volt-free contact outputs from Bender fault-repeater evaluator devices (such as the ESD-470SMO480) may also be connected the SA380TX general purpose digital inputs.
- If a 4-20mA output converters such as the RK170 is utilised, this can be connected to the SA380TX general purpose analogue inputs, although RS485 connection is preferred.
- Other models of Bender isometer may be supported over RS485 - check the Bender documentation to see if the RS485 protocol matches
- Please be aware that 1 x SA380TX can only monitor 1 x Bender Isometer. This is a limitation of the Bender protocol, not the SA380TX.
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| Parameter | Units | RS485 | 4-20mA | Digital VFC | Notes |
|---|---|---|---|---|---|
| Instantaneous Resistance to Earth | k Ohm | This is the last reading of Resistance-to-Earth taken by the isometer | |||
| Alert Levels | k Ohm | The isometer permits two configurable alert thresholds. These levels are both reported | |||
| Alarm Status | Digital | Reports if either alarm level has been breached | |||
| Fault Repeat Relay Status | Digital | Reports if output fault relay has been energised. Essentially mirrors alarm status | |||
| Connection Error | Digital | Set to UP or TRUE is not RS485 data has been received from the isometer for 7 minutes. | |||
| AC, DC+, DC- Fault | Digital | For DC Systems, Indicates which leg is experiencing the worst fault. For AC systems, only the AC flag will be asserted. | |||
| Fault Repeater Evaluator Output | Digital | Where a fault repeater evaluator is provided and a single isometer monitors a multiple-feeder arrangement, a digital volt-free-contact output is provided for each feeder. The feeder experiencing the worst fault will have its contact closed. |
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Where a fault repeater exists, up to 12 digital outputs may be provided to indicate which sub-feeder is experiencing the worst insulation resistance. These are wired as per standard digital inputs:
| Info |
|---|
The diagram on the left shows direct connection. Please consult the Bender user guide for exact terminations. Note that if the isometer is built into a Network Rail style cubicle arrangement, the "common" VFC connection is brought-out at the base of the cubicle through the terminal block position 37. The 12 individual feeder alarm signals are presented on terminal 38 (Feeder 1) through to 49 (Feeder 12). This is shown on the right |
Configuration & Comissioning
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