例一：一台11kw 故障现象：通电无显示故障故障分析：变频器高压直流供电led灯亮，说明高压直流供电正常。检测低压直流供电都没有直流电压，这正是开关电源电路不工作的现象。开关电源电路不工作实际上就是开关管（k1317）不工作，检测直流电压没有送过来。查出是连接高压直流电端与脉冲变压器初级端之间降低压电阻损坏开路。故障原因：降低压电阻老化损坏开路，致使高压直流电未能加到脉冲变压器的初级绕组上。开关电源无法工作，整个变频器无低压直流供电，出现无显示故障。故障处理：更换降低压电阻。
例二：一台7。5kw 故障现象：没有任何显示，施耐德变频器维修电话，黑屏故障分析：测量igbt模块正常，拆开机器，发现电源电路有明显炸黑的痕迹，说明开关电源已经烧坏。测量开关管k1317损坏，z1二极管in4746开路，保护电阻r1，r8，1r/1/2w断路，led灯也炸飞，只有uc3844正常。故障原因：由于器件老化造成。 故障处理：更mos管k1317，r1，r81r/1/2w，二极管in4746，变频器恢复工作。
例三：一台1。5kw 故障现象：没有任何显示故障分析：变频器高压直流供正常，面板无任何显示，而且变频器控制电路上都没有一点电压，属于开关电源电路不正常工作。故障原因：变频器是由uc3844损坏后输出电流高电平，使开关管长期导通状态，长时间过流导致开关管损坏。故障处理：检测开关管k1317漏极上电压正常，测得控制极上无脉冲信号，而只有一直流电压。这说明uc3844输出信号不正常，经检查uc3844已经损坏，同时开关管k1317也损坏。更换已坏的无器件即可正常工作。
DC AC Low Frequency PowerInverters 1KW 2KW 3KW 4KW 5KW 6KW with Toridal Transformerand Wifi Monitoing Card
KeyFeatures:
Pure sine wave output, with rated power: 1KW to 12KW(12V/24V/48V/96Vdc)
With UPS function, DC to AC automatic conversion
Wide AC Voltage & Frequency for AC and Generator Input
Adjustable battery voltage for different types of batteries, suchas LD: lead-acid battery (default), GEL: gel battery, LI: lithiumbattery.
DC Cold Start and Automatic Self-Diagnostic function
With 5 working modes for choose
01: MainsPriority /
02: Energy Saving /
03: Battery Priority /
04: Unattended Mode /
05: Solar Priority
High Efficiency Design
Power Saving Mode to Conserve Energy
Smart LCD display and setting (Working modes, Charge Current,Charge Voltage, AC range input , battery voltage ,Battery lowvoltage shutdown etc.)
High-low voltage protection,overload, short-circuit Protection,under-voltage and over-temperature protection,over voltage, batteryreverse connection (optional) etc.
AC Charging current 5A -60A adjustable for 1KW - 12KW, Max 70Acustomizable for 4KW -12KW Model
Support RS232, RS485 communication port (Optional)
Support Wifi Plug for remote monitoring and management throughcellphone App (Optional)
Protectionagainst:
Over load, over temperature, over charging, low battery
Reverse connection(optional by hardconnector) Blackouts.Output short circuit protection.
,Temperature protection,Overload protection etc.
Application
UPSEN Power Srar Plus Series Inverter can be used for various homeappliances, Emergency Lighting Systems,Toys,Fire,SecuritySystems,Geophysical E,Vending Machinesetc.
