Overview
The Honeywell 10310/2/1 is an Earth Leakage Detector (ELD) designed for monitoring insulation-related earth faults in DC power systems. It supports 24 V DC, 48 V DC, 60 V DC and 110 V DC monitored systems, while using a separate 24 V DC module supply. Furthermore, it provides manual self-testing, earth connection monitoring and relay-based fault indication for safety system applications.
Earth Leakage Detection and Operation
The 10310/2/1 monitors the electrical relationship between the DC supply and earth. Under normal conditions, it maintains an earth reference of -12 V DC. When an earth fault occurs, the detector responds to the specified earth current threshold and changes its internal relay state.
In addition, the module supports three earth connection operating modes:
- DC mode: Maintains a continuous -12 V DC earth reference.
- 1 Hz mode: Interrupts the earth connection at 1 Hz.
- 1/4 Hz mode: Interrupts the earth connection at 0.25 Hz, supporting earth fault location using suitable measuring equipment.
The module also includes a manually operated self-test and earth connection monitoring function. An earth fault sets the internal flip-flop and de-energizes the relay. The fault condition remains latched until the operator or an external reset signal resets the module.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | 10310/2/1 |
| Brand | Honeywell |
| Product Type | Earth Leakage Detector (ELD) |
| System | Honeywell Safety Manager / FSC |
| Monitored DC Systems | 24 V DC, 48 V DC, 60 V DC or 110 V DC |
| Module Supply Voltage | 24 V DC |
| Maximum Supply Voltage | 30 V DC |
| Maximum Supply Current | 60 mA |
| Rst24 Input Range | 18 to 70 V DC |
| Rst110 Input Range | 40 to 130 V DC |
| Rst24 Input Current | 1.1 mA at 24 V DC |
| Rst110 Input Current | 2.5 mA at 110 V DC |
| Normal Earth Voltage | -12 V DC |
| Earth Fault Voltage Range | -30 to +125 V DC |
| Earth Fault Threshold Current | 5.5 mA +/- 1 mA |
| Maximum Alternate Earth Current | 25.0 mA +/- 5 mA |
| Maximum Output Voltage | 115 V DC |
| Maximum Output Current | 2 A |
| Initial Relay Contact Resistance | 30 mOhm |
| Maximum Relay Current | 5 A |
| Maximum Switched Voltage | 250 V DC / 250 V AC |
| Maximum Switched Load | 100 W / 1000 VA |
| Electrical Life | 100,000 switching operations |
| Mechanical Life | 200,000,000 switching operations |
| Module Keying | Holes A5 and A11 |
Reset and Relay Output
The detector provides two external reset inputs, Rst24 and Rst110. Therefore, the module can receive a reset signal through the corresponding voltage range without requiring manual operation of the front-panel switch.
Its relay output provides common (C), normally open (NO) and normally closed (NC) contacts. Furthermore, the internal fault latch keeps the relay in its fault state until a valid reset occurs.
Frequently Asked Questions
Q: Which DC systems can the Honeywell 10310/2/1 monitor?
A: It supports 24 V DC, 48 V DC and 60 V DC systems, as well as 110 V DC systems. The module itself requires a 24 V DC supply, with a maximum permitted supply voltage of 30 V DC.
Q: How can the earth leakage detector be reset?
A: The module supports three reset methods: manual reset using the front-panel switch, a high-level signal at Rst24, or a high-level signal at Rst110. The applicable reset input voltage must remain within its specified range.
Q: What does the A5 and A11 keying configuration mean?
A: The module uses holes A5 and A11 for its module key coding. The corresponding rack code uses large pins at A5 and A11. Check the rack connector coding before selecting a replacement module.
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