Instructions for NOVUS models including: 5001062 Heater Resistance Fail Detector, 5001062, Heater Resistance Fail Detector, Resistance Fail Detector, Fail Detector
General - - NOVUS Automation Inc. - Page 22
File Info : application/pdf, 1 Pages, 502.61KB
DocumentDocumentUsing the HBD option for the N1200 controller Heater Resistance Fail Detector 5001062 V2.0x B The HBD (Heater Break Detector) option provides means of detecting a mal function in the heater resistance, by monitoring the current that flows through it. This option consists of a dedicated PCB connected internally to the N1200 and a current transformer (CT) mounted externally at the load. Installation When the HBD model controller is ordered, the HBD accessory is already mounted in the N1200. The user must then connect the CT to terminals 14 and 15 at the instrument back panel (any polarity). Controller configuration The HBD parameters are: Parameter Function Cycle kb.i Current indication as measured by the Operation CT (in amperes) Cycle Maximum CT Span. kb.fs For the CT accompanying the controller, this parameter must be Scale Cycle defined as 60.0, an indication that the maximum measured current is 60 A The CT was designed such as to facilitate its insertion in the load circuit. The CT core can be opened to allow the load wire to be installed inside the core, without opening the circuit. The CT wires may be stretched up to 3 meters long and must be kept away from other wires and cables of the installation. Operation When the PWM control output is used, the controller monitors the load current when this output is turned ON and OFF, indicting on the kb.i screen the current with higher value (usually, the current that is present when the output is ON.) The minimum current alarm (Kb.L) takes this ON current measurement and compares it with the respective setpont value. If this current is below the alarm set point, the alarm is activated, indicating a faulty resistance. The maximum current (Kb.k) alarm compares OFF current measurement with the setpoint for this alarm. If the current is above the alarm set point, the alarm is activate to indicate problems in the actuator (short-circuited SSR, bad contactor , etc.). For any other situation that does not use the PWM control output, the display current value is the instant value measured. The minimum/maximum current alarm (Kb.Lk) executes both operations described above simultaneously. In the alarm Functions parameters, the parameters are: Parameter Function Cycle Fua1 Fua2 Fua3 Fua4 Kb.L Minimum current alarm. Kb.k Maximum current alarm. Kb.Lk Minimum and maximum Alarm cycle current alarm. When a HBD alarm functions is used, its alarm setpoint is expressed in Amperes.. Parameter Function SP.A1 Electric current values in amperes (A) SP.A2 SP.A3 SP.A4 Cycle Tuning cycle Notes: 1- For a perfect operation of the controller in monitoring the electric current, the PWM Cycle Time (ct) must be defined with a value above 2 seconds. 2- The current measure accuracy is 3.3 % (±2 A).