Technical Specifications

FAQ

1. What is the GE Multilin UR 6LH Digital I/O Module used for?
The GE Multilin UR 6LH is a multifunction digital I/O module designed for Universal Relay systems. It combines digital contact inputs with Form-A and Form-C relay outputs in a single module. The inputs can be used to monitor breaker position, auxiliary contacts, switches, interlocks and other field status signals, while the relay outputs can be assigned to control or signaling functions within the protection and automation scheme.

2. How many digital inputs are available on the UR 6LH?
The UR 6LH provides eight contact inputs. These inputs can be connected to field devices such as circuit breaker auxiliary contacts, disconnect switches, control switches and other binary status signals. The relay can process these signals through its configured logic, allowing operators and protection engineers to use field status information for monitoring, interlocking, alarms and automated control sequences.

3. What type of relay outputs does the UR 6LH provide?
The UR 6LH provides two Form-A outputs and two Form-C outputs. The Form-A outputs are designed for applications requiring normally open contacts, while the Form-C outputs provide changeover contacts with normally open and normally closed connections. This combination gives engineers flexibility when designing breaker control, alarm, interlocking and auxiliary control circuits.

4. Does the UR 6LH support current and voltage monitoring?
Yes. The UR 6LH includes current monitoring capability on its Form-A outputs, with optional voltage monitoring depending on the specific system configuration. These functions can provide additional information about output circuit conditions and can be useful in applications where confirmation of control circuit operation is important. The exact monitoring functions should be verified against the relay configuration before commissioning.

5. Can the UR 6LH be used for circuit breaker control?
Yes. The module is suitable for applications involving circuit breaker control and monitoring. Its digital inputs can receive breaker auxiliary contact feedback, while its relay outputs can be assigned to control or signaling functions. In a typical protection system, the relay logic can use the input status to determine whether a breaker is open or closed and coordinate control, interlocking, alarm and protection-related functions.

6. What should be checked when installing a UR 6LH module?
Before installation, confirm that the module is the correct I/O option for the specific GE Multilin UR relay and that the field wiring matches the configured input and output functions. Check the input common connections, contact circuits and Form-A/Form-C output terminals carefully. The relay configuration should also be reviewed so that each physical I/O point corresponds to the intended protection, control or monitoring logic.

7. How can a digital input fault on the UR 6LH be diagnosed?
Start by checking the field contact, control voltage and wiring associated with the affected input. Verify that the signal reaches the correct input terminal and that the common connection is secure. Next, check the corresponding I/O status and configuration through the UR relay interface or EnerVista UR software. If the external signal is correct but the input status does not change, inspect the terminal connections and module condition before replacing the I/O module.

8. What should be checked if a UR 6LH relay output does not operate correctly?
First verify that the output has been correctly assigned in the relay logic and that all required protection or control conditions are satisfied. Then check the output status through the relay interface and inspect the external control circuit, terminal connections, fuses and associated equipment. For Form-A and Form-C outputs, make sure the correct contact terminals are being used. If the configured logic is correct and the external circuit is healthy but the output remains inactive, the module should be tested further as a possible hardware fault.