Product Introduction
The F48-ZBKΩ-Ⅱ DC Insulation Monitoring Module is a DC bus insulation monitoring module that issues a ground fault alarm signal when the insulation resistance between the positive and negative poles of the DC system reaches the alarm setting value. It also performs ground fault branch detection to locate the ground fault in a few power supply circuits, thereby improving the speed of ground fault handling, reducing labor, shortening the ground fault cycle, and making the power system operation safer.
Specifications
F48-ZBKΩ-Ⅱ DC Insulation Monitoring Module
The DC bus insulation monitoring module is designed to detect when the insulation resistance between the positive and negative poles of a DC system reaches the alarm setting value. It issues a ground fault alarm signal and performs ground fault branch detection, pinpointing the ground fault to a few power supply circuits. This improves the speed of ground fault handling, reduces workload, shortens the ground fault cycle, and makes the power system safer.
A DC system is a very large, multi-branch power supply network, and a common fault is single-point grounding. Under normal circumstances, single-point grounding does not affect the operation of the DC system. However, if the ground fault point cannot be quickly found and repaired, and another ground fault occurs, it may cause malfunctions in signal circuits, control circuits, relay protection devices, etc., thereby disrupting the safe operation of the power system and even causing large-scale power outages. Although some automatic ground fault detection devices for DC systems have been developed, and some are widely used, these devices often issue false alarms and cannot accurately and promptly locate the true ground fault point in the DC system.
Features
1) Monitors and displays the voltage of two DC bus sections and the voltage between the positive and negative busbars and ground.
2) Monitors the insulation resistance to ground of two DC bus sections and displays the insulation resistance values of both positive and negative bus sections.
3) Features RS485 communication functionality with four RS485 interfaces; allows reading voltage values, resistance values, SOE event records, time modification, and time synchronization via communication.
4) Each RS485 interface has a communication status indicator light (one red and one green, indicating transmit/receive status).
5) Switch status data acquisition function, capable of acquiring three channels of switch status data.
6) Dry contact output function, with five relay outputs indicating faults and alarms.
7) Keypad input function, allowing parameter setting and value modification via buttons. A total of 16 buttons.
8) LED indicator function, with four LED status lights indicating power status, faults, and alarms.
9) LCD display function, displaying voltage, resistance, time, set values, and related settings.
10) Capable of recording 500 SOE events, readable via RS485 communication interface.
11) Applicable to DC 220V and DC 110V systems.
12) Switches the unbalanced bridge once daily at 06:00:00 to ensure timely detection of uniform insulation degradation between poles and ground.
13) Features bus switch status detection; if the bus tie switch is closed during independent operation of two sections, it automatically switches to parallel detection for both sections, preventing interference from simultaneous detection.
14) Equipped with hardware clock and communication time synchronization functions.
Technical Parameters
1) Positive and Negative Insulation Resistance Measurement: 0-1000kΩ
2) Grounding Alarm Resistance Setting: 0-100kΩ, 1kΩ step
3) Voltage Over-Limit Alarm Setting: 10~300V, arbitrarily set
4) Busbar Voltage Accuracy: ±1%
5) Busbar Insulation Resistance Measurement Accuracy: Error ≤5%±1.0kΩ
6) DC System Voltage Level: 220VDC, 110VDC
7) Device Operating Voltage: 90VDC~365VDC
8) Number of Busbar Sections: 2 sections
9) Relay Contact Current: DC220V/2A
10) Device Power Consumption: ≤20W
11) Operating Environment: -5℃～45℃; 5～95%RH, non-condensing
12) Storage Temperature: -20℃～70℃
Function Introduction
4.1 Panel:
4.2 Panel Functions and Wiring Terminal Description:
4.21 Front Panel:
1. Buttons:
1.) Numeric Keypad: Used to input numbers 0-9.
2.) Function Keys: "OK" and "Cancel".
3.) Directional Keys: "↑", "↓", "←", "→". Corresponding to up, down, left, and right.
2. LED Indicator Lights:
1.) Power Indicator (Green).
2.) Device Fault (Red).
3.) Section I Busbar Insulation Alarm (Red).
4.) Section II Busbar Insulation Alarm (Red).
3. LCD Display:
1.) Main Interface Displays Voltage, Resistance, and Time.
2.) System Settings Interface and its 8 Sub-interfaces.
3.) The eight sub-interfaces are: Operating Mode, Voltage Level, Voltage Limit Exceedance, Voltage Adjustment, Alarm Resistor, Energy Communication Settings, Event Log, and Date & Time.
4.21 Rear Panel:
1. Busbar I Communication: http://www.whmoen.com/jbhl/106.html
1.) “Connect to Host Computer”: Communicates with the host computer via RS485 interface.
2.) “Connect to Sub-Computer”: Communicates with the sub-computer via RS485 interface.
2. Busbar II Communication:
3.) “Connect to Host Computer”: Communicates with the host computer via RS485 interface.
4.) “Connect to Sub-Computer”: Communicates with the sub-computer via RS485 interface.
3. Switch Status:
1.) “Bus Tie”: Bus tie switch status detection.
2.) “Spare 1”: Spare switch status detection 1.
3.) "Backup 2": Backup switch status detection 2.
4. Fault and alarm relay outputs:
1.) "Device": Includes device fault output and device power failure alarm output.
2.) "Bus 1": Section I bus insulation alarm output.
3.) "Bus 2": Section II bus insulation alarm output.
4.) "Backup 1": Backup relay output 1.
5.) "Backup 2": Backup relay output 2.
5. Bus I:
1.) "+KM": Connect to the positive terminal of Section I control bus.
2.) "-KM": Connect to the negative terminal of Section I control bus.
6. Bus II:
3.) "+KM": Connect to the positive terminal of Section II control bus.
"-KM": Connect to the negative terminal of Section II control bus.
