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Advantages and Features
LCD is 128*84, with backlight、to languages (Simplified Chinese and English) display, button operation.
Has functions of over voltage, under-voltage , phase loss, reverse phase sequence, over frequency and Under-frequency.
Has automatic / manual state , in manual mode, it can be forced to switch on or off. All parameters are programmable on site, using two level password to prevent nonprofessional to incorrect operate.
Can be set as on-load/off-load mode for test operation of generating units on site.
It has switch reclosing and power-off reclosing functions.
Closing output can be set to pulse or continuous output
Apply to one breaking temminal 、two breaking terminals and NON breaking temminal
Two N lines are isolated by voltage transformer.
Real-time clock display.
It has the function of timed start-up and shut-down of generating units. it can be set to run single time, once a month or once a week, and can also set whether to run on-load or not.
The cycle operation of two generators can be controlled, and the running time and the interval shutdown time of the generators can be set.
DC power supply or AC power supply.
Standard 485 communication interface with ModBus communication protocol, has remote control, remote communication, remote detection "three remote" function.
Current controller status can be queried (current status of input port and output por, circuit abnormalities such as over-voltage, under-voltage, over-frequency, under-frequency, etc.)
Working conditions and installation modes
Category | Description |
Working conditions | Temperature:(-25+70)℃ Wumidity:(20~90)%; |
Storage conditions | Temperature:(20~90)%; |
Protection level | lp55:When the waterproof rubber ring is strengthened between the controller and the control panel IP42:When the waterprofrubberringnot strengthened between the controlerand he oontol panel |
nsulation strength | Object:Between Input/Output/Power Supply |
Reference standard:IEC688-1992; | |
Test method:AC1.5KV/1min leakage current 5mA | |
Installation mode | Installed in non-vibration electric cabinet |
Technical Data
ltem | Content | |
Working voltage | 1. DC 8.0V to 35.0V continuous power supply | |
Overall power consumption | ≤3W(Standby mode:<2W) | |
AC voltage input | 3 phases 4 wire(ph-N) | AC170V~AC277V |
Single phase 2 wire(ph-N) | AC170V~AC277V | |
2 phases 3wire(ph-N) | AC170V~AC277V | |
Rated frequency | 50/60Hz | |
closing relay output port | 5A AC250V Passive output | |
Programmable relay output 1 | 7A AC250V Passive output | |
Programmable relay output 2 | 7A AC250V Passive output | |
Programmable relay output 3 | 16A AC250V Passive output | |
Programmable relay output 4 | 16A AC250V Passive output | |
Digital valur input | Grounfing connection is active | |
Communication | RS485 isolated interface,MODBUS protocol/front-end intelligent device protocol(YD/T 1363.3-2005) | |
Controller size | 139mm×120mm×48mm | |
install hole size | 130mm×111mm | |
Working conditions | Temperature:(-25~+70℃)Relative humidity:(20~93)%RH | |
Storage conditions | Temperature:(-25~+70℃) | |
Protection level | IP55: when the controller and control panel bracket are equipped waterproof rubber ring | |
Insulation strength | AC2.2KV voltage is applied between AC high voltage terminal and low voltage terminal,the leakage current is no larger than 3mAin1 minute | |
Weight | 0.62kg | |
Operating Panel description
●Manual mode
Press the "Auto" key:The manual status indicator Go is on and the controller is in the manual state.
Press the "Ⅰ" key:circuit l closing relay output if circuit l closing indicator lights up,it means circuit lI on load.
Press the "Ⅱ" key:circuit ll closing relay output, if circuit ll closing indicator lights up,it means circuit ll on load.
Press the "O" key:switch relay output,if l and ll closing indicatorlights are not on,it means switch off.
●Auto Mode
Press the "Auto' key,auto mode indicator light "Auto" is on,controller is in auto mode, the ATS will "CLOSE"or"OPEN" according to the status of #Ⅰand # Ⅱ power supply. It will transfer according to the pre-set priority if #Ⅰ and # Ⅱ are both normal. If there is no priority, ATS will choose the current under working power supply until it gets abnormal snd ATS will transfer to the other power supply automatically.
Wiring terminal function description
Terminal umber | Item | Function description | Remark | |
1 | B- | Connect battery negative electrode of the generator set starting | DC negative input | |
2 | B+ | When it is necessary to start the generator, connect battery charge positive electrode of the generator set starting | DC Positive Input(8~35V) for controller | |
| 3 | Programmable output 1 | Default 1 # Switch off output | passive relay contact output, rated 7A | |
4 | ||||
5 | Programmable output 2 | Normal close | The dedault is generator startup,normal open output | passive relay contact output, rated 7A |
| 6 | Common terminal | |||
| 7 | Normal open | |||
8 | Programmable output 3 | Normal close | Default ATS power A phase output | passive relay contact output, rated 16A |
| 9 | Common terminal | |||
| 10 | Normal open | |||
11 | Programmable output 4 | Normal close | Default ATS power A phase output | passive relay contact output, rated 16A |
| 12 | Common terminal | |||
| 13 | Normal open | |||
14 | #1 closing output | Passive relay contact output | passive relay contact output, rated 16A | |
15 | ||||
16 | #2 closing output | Passive relay contact output | passive relay contact output, rated 16A | |
17 | ||||
18 | A1 | 1#AC 3 phases 4 wire voltage input | For single-phase input,only A1 and N1 are accessed | |
19 | B1 | |||
20 | C1 | 1#AC 3 phases 4 wire voltage input | For single-phase input,only A1 and N1 are accessed | |
21 | N1 | |||
22 | #1 closing input | Detecting the closing state of #Ⅱ，auxiliary contact input | Grounding connection is active | |
23 | #2 closing input | |||
24 | Programmable intput 1 | User-defined function | Grounding connection is active | |
25 | Programmable intput 2 | User-defined function | Grounding connection is active | |
26 | Common terminal | GND | ||
27 | A2 | #Ⅱ AC 3 phase 4 wire voltage input | For single-phase input,only A2 and N2 are accessed | |
28 | B2 | |||
29 | C2 | |||
30 | N2 | |||
31, 32, 33 | A, B, GND | Standardized RS485 communication interface | ||
FAQ
Question 1: How to configure dual power supply priorities and switching logic?
Priority Configuration: Use the control panel buttons to set power priority modes: “Priority to Source 1,” “Priority to Source 2,” or “No Priority.”
Switching Logic:
Auto Mode: Automatic switching based on preset conditions (e.g., voltage/frequency anomalies).
Manual Mode: Force-switch between sources via panel buttons.
Emergency Control: A “Forced Disconnect” input port allows immediate ATS (Automatic Transfer Switch) disconnection for maintenance or fault scenarios.
Question 2: How is the load capacity of relay output interfaces designed? Why use passive contacts?
Load Capacity:
Circuit Control Relays (1#CLOSE/2#CLOSE/OPEN): 5A AC25V, suitable for low-power control circuits (e.g., contactor coils).
Generator Start Relay (GENS START): 7A AC250V/DC28V, designed for high-power equipment startup.
Passive Contacts:
Enhances compatibility by allowing integration with external power control circuits.
Reduces internal system interference risks.
Question 3: What are the advantages of an independent dual-neutral (N-line) design?
Electrical Isolation: Dual neutral lines prevent shared-ground interference or short circuits caused by potential differences.
Safety Compliance: Meets international standards (e.g., IEC 60947), ensuring insulation integrity during faults.
Maintenance Efficiency: Isolated design simplifies troubleshooting and allows maintenance on one power source without interrupting the other.
Q4: What are the main differences between SKR2-A and SKR2-B？
SKR2-B is primarily used for generator control, supporting:
Automatic/manual start/stop of generators
Scheduled operation (one-time, weekly, or monthly)
Dual-generator cycle control
Protections: Over-voltage, under-voltage, phase loss, reverse phase sequence, over-frequency, under-frequency
MODBUS-RTU communication ("Three-Remote" function: remote control, monitoring, and detection)
SKR2-A is designed for automatic transfer switching (ATS), supporting:
Automatic/manual switching between dual power sources (utility/generator)
Priority settings (1# power priority, 2# power priority, no priority)
Forced trip function (only for ATS with a trip position)
Programmable relay control (AUX.OUTPUT1/2)
