User Manual Q&AAnswer
Apr 07, 2025 - 10:58 AM
To install and use the HBD (Heater Break Detector) option on the NOVUS N1200 Heater Resistance Fail Detector, please follow these steps:
1. Ensure that the HBD accessory is already mounted in the N1200 controller when you receive it.
2. Connect the current transformer (CT) to terminals 14 and 15 at the instrument back panel. The polarity does not matter.
3. The CT is designed to facilitate insertion in the load circuit. Open the CT core and insert the load wire inside it without opening the circuit.
4. The CT wires can be stretched up to 3 meters long. Make sure to keep them away from other wires and cables in the installation.
5. If you are using the PWM control output, the controller will monitor the load current when the output is turned ON and OFF. The kb.i screen will display the current with the higher value, usually the current when the output is ON.
6. The minimum current alarm (Kb.L) compares the ON current measurement with the setpoint value. If the current is below the alarm setpoint, the alarm is activated, indicating a faulty resistance.
7. The maximum current alarm (Kb.k) compares the OFF current measurement with the setpoint for this alarm. If the current is above the alarm setpoint, the alarm is activated to indicate problems in the actuator (short-circuited SSR, bad contactor, etc.).
8. For situations that do not use the PWM control output, the display current value is the instant value measured.
9. The minimum/maximum current alarm (Kb.Lk) executes both the minimum and maximum current alarm operations simultaneously.
10. To configure the HBD parameters, access the controller's configuration menu.
11. The HBD parameters include Cycle (current indication as measured by the CT), Operation Cycle (maximum CT span, usually set to 60.0 for the accompanying CT), and Scale Cycle.
12. In the alarm functions parameters, you can set the minimum and maximum current alarm cycles.
13. When using HBD alarm functions, the alarm setpoint is expressed in Amperes.
14. For optimal operation, ensure that the PWM Cycle Time (ct) is defined with a value above 2 seconds.
15. The current measurement accuracy is 3.3% (±2 A).
Please refer to the NOVUS N1200 Heater Resistance Fail Detector manual for more detailed information and specific instructions.
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