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在工作过程中有以下三种情况可导致A316J报OC信号：

1、负载异常导致运行电流过大（大于额定电流的3倍左右），使IGBT管子的管压降大于7V；

2、IGBT管子有开路性损坏；

3、驱动电路不良，造成IGBT管子的欠激励，此时输出电流虽偏小，但因管子处于微导通和随机关断状态下，因而其管压降大于动作阀值，也会送出OC信号。

在维修时，需判别A316J及脉冲回路的好坏时，（在并不明了IGBT管子的好坏的情况下，断开逆变回路供电后），可将A316J的14脚外接电阻与二极管串联电路与A316J的16脚短接，解除掉OC报警和脉冲封锁功能，利于检测A316J本身及脉冲输入、输出电路的好坏。

一例A316J驱动不良的故障：

接修一台小功率变频器，更换损坏IGBT模块，上电试机，当频率上升到20Hz及以上时，电机出现“咯噔”声，并伴随电机机体的抖动，运行中时有报OC停机现象的发生。检测输出电压，也有抖动现象。判断为IGBT模块内某一只管子导通不好或性能不良或某一路驱动电路不良。

1、当挑开W上臂驱动A316J的6脚后，空载运行中不再跳OC故障。查A316J的14脚外围元件，无异常，更换A316J后故障依旧；

2、单独更换W上臂IGBT管子试验，故障依旧；

3、故障还在A316J外围电路。拆下A316J供电电源的两只100uF/25V电容，检测容量只有几微法了。又顺便检查了其它驱动电源的电容，发现皆有失容或容量严重减小的现象。逆变模块的损坏原因正在于此。

驱动电源的电容失效后，使电源的带负载能力大为降低，表现为负载低速空载运行（小电流运行中）时，模块内IGBT管子尚维持较小的导通压降，电机还能“稳定运行”。当频率上升或带载运行时，由于驱动电源的电容失效，驱动能力下降使IGBT管子不能良好开通，形成较大的导通电阻，出现三相严重不平衡而导致电机跳动，并进而因管压降继续增大，使A316J检测电路输出OC信号而保护停机。如果说正的驱动电压的滤波电容失容，只会造成欠激励，跳OC信号而停机；那么负的截止电压的滤波电容的失容，则会带来危险的后果！截止负压的不足，易造成IGBT管子在开通后不能有效截止，出现某相上、下臂两只管子共通短路的可能，导致了逆变模块的炸裂损坏！

ALLEN BRADLEY 3PH 25/30/50HP SIZE 3 COMBINATION DISCONNECT 512-DAB-26 SER. B

ALLEN BRADLEY 24V RED ILLUMINATED PUSH BUTTON 800MR-QBL24RAK SER. D

ALLEN BRADLEY TX/RX ANTENNA 2750-H1 SER. B

ALLEN BRADLEY MANUAL STARTING SWITCH 600-TAX5

ALLEN BRADLEY PROCESSOR COMMUNICATIONS INTERFACE CARD 1784-KTP SER. B

ALLEN BRADLEY 115-120V COIL SIZE 0 CONTACTOR 500-AOD93 SER B

ALLEN BRADLEY 1492-H1 SERIES B 60 PIECES FINGER-SAFE TERMINAL BLOCKS,

ALLEN BRADLEY  3 POLE TRAILER FUSE BLOCK  40023-441-11

ALLEN BRADLEY 130V RED LENS PILOT LIGHT 800T-QH13R SER. U

ALLEN BRADLEY 512-AJB-A1E-1-4?R-6P-24J NEMA 0 COMBO NON-REVERSING STARTER SER 1

AB FLUSH HEAD BLUE PUSHBUTTON 800T-A7P

ALLEN BRADLEY 10A CIRCUIT BREAKER SER.C LOT OF 4 1492-CB1H100

ALLEN BRADLEY .250KVA CONTROL CIRCUIT TRANSFORMER 1497-N8 A / X-326539

ALLEN BRADLEY 30A 600V 3 POLE TRAILER FUSE BLOCK 40023-437-02

ALLEN BRADLEY RAM MEMORY MODULE 8K WORDS 1772-ME8

ALLEN BRADLEY 42GRP-9062-QD SER. A 264V PHOTOSWITCH W/ TURCK RKM 56-4M CORDSET

ALLEN BRADLEY 40-250V AC/DC 3-PIN PROXIMITY SWITCH 871ZC-BW2N12-R3 SER. A

ALLEN BRADLEY 13KVA ADJUSTABLE FREQUENCY AC DRIVE 1336S-B010-AA-E?N4-HAP-L6 SER D

ALLEN BRADLEY FLEX I/O OUTPUT MODULE 1794-IA8 SER A REV C02

ALLEN BRADLEY 110/120VAC OR 120VDC COIL SOLID STATE TIMER 700-RTC41Y300U1

ALLEN BRADLEY LIMIT SWITCH OPERATING HEAD 802M-BX SER. B

ALLEN BRADLEY 24VDC COIL 22 A CONTACTOR 100-C090DJ10 SER. A

ALLEN BRADLEY 240/480V TO 120 STEP-DOWN TRANSFORMER 1497-G-BASX-3-N

ALLEN BRADLEY 200A-600V FUSE BLOCK HOLDER X-402244

ALLEN BRADLEY 120VAC 0.42-5.0A AC CURRENT RELAY 809S-NX1 SER. A

ALLEN BRADLEY PARTS KIT 40266-464-02

ALLEN-BRADLEY 24V PILOT LIGHT GREEN 800T-N3196 SER C  1 LOT OF 2

ALLEN BRADLEY RED INCANDESCENT STACK LIGHT SER.B 855T-B24DN4

ALLEN BRADLEY RED PUSHBUTTON WITH BLUE CONTACT 800E-A2L

ALLEN BRADLEY COMMUNICATION INTERFACE CARD 1784-KTXD SER. B

ALLEN BRADLEY PANELVIEW 900 OPERATOR INTERFACE PANEL 2711-T9C1 SER. A FRN 2.03

ALLEN BRADLEY PUSH-2-TEST PILOT BULLETIN 800E  800E-2DLT3GX11 SER A

ALLEN BRADLEY  SELECTOR SWITCH UNIT   X 66215

ALLEN BRADLEY RESOURCE MANAGER HOST BOARD MODULE 5130-RM/A

ALLEN BRADLEY BULLETIN 700 TYPE P DIRECT DRIVE 700P600A1 SER. B

ALLEN BRADLEY PUSH BUTTON PILOT LIGHT 800MR-QT24K SER. D

ALLEN BRADLEY 800MR-H31BB 2-POSITION CYLINDER LOCK OPERATOR SELECTOR SWITCH,

ALLEN BRADLEY MANUAL STARTING SWITCH 609-AOW SERIES G, 3 PHASE

ALLEN BRADLEY MUSHROOM PUSH BUTTON SER A 800EM-M5

ALLEN BRADLEY 91670601 1771-HT3 ESTOP I/O TERMINATION PANEL, NNB

ALLEN BRADLEY ArmorBlock MaXum 8 I/O MODULE 1792D-8BIO8E SER. B

ALLEN BRADLEY SER. A PRESSURE CONTROL SWITCH 836-C3 NO ENCLOSURE

ALLEN BRADLEY END BARRIER 1492-N36 SER. A BOX OF 50

ALLEN BRADLEY AUXILIARY CONTACT BLOCK SER.B LOT OF 4 100--F A40

ALLEN BRADLEY 24VDC COIL RELAY 700DC-P400Z24 SER. A

ALLEN BRADLEY 8-24VDC INCREMENTAL ENCODER 845H-SJJK22CFY2 SER. C

ALLEN-BRADLEY 0.75 KVA 220/440V TYPE BT CONTROL CIRCUIT TRANSFORMER X-343858

ALLEN BRADLEY 24VDC COIL REVERSING CONTACTOR 104-C12DJ22

ALLEN BRADLEY 120V AC POWER SUPPLY MODULE 1771-P4 CLIP IS BROKEN ON THE TOP

ALLEN BRADLEY RED PUSH-TO-TEST PILOT LIGHT AND LENS 800MR-N2R SER. A

ALLEN BRADLEY 15/20HP AC DRIVE VOLT SHARING RESISTOR KIT 155966

ALLEN BRADLEY 710-HF32Z24-4 SER B 24 VDC WITH BASE 700-HN116 SER B LOT OF 2

ALLEN BRADLEY 95/110V-50/60CY OPERATING COIL 4A01

ALLEN BRADLEY 120VAC 1.0A POWER SUPPLY, 1771-P4R SER.C REV. A01

ALLEN BRADLEY 12-120V AC OUTPUT MODULE 1771-OAD SER. B LOT OF 3

ALLEN BRADLEY 1787USADPTR ADAPTER FACTORY SEALED

ALLEN BRADLEY 2-POLE CONTACT BLOCK SER.A 100-F 99728

ALLEN BRADLEY 1771-0FE1 B ANALOG OUTPUT MODULE

ALLEN BRADLEY 1336S-BRF75-AN-?DE4 SERIES D

ALLEN BRADLEY FRONT MOUNT AUX CONTACT SER.B 100-FA11

ALLEN BRADLEY 1336S PLUS 5HP AC DRIVE 1336S-BRF50-AA-?EN5 SER. E

ALLEN BRADLEY  SELECTOR SWITCH SER.C   800MR-HK2BBK

ALLEN BRADLEY SIZE 2 COMBINATION STARTER DISCONNECT 512-CAB-25R SER. C

ALLEN BRADLEY 800T-J18 SERIES T 3 POSITION SPRING RETURN SELECTOR SWITCH,

ALLEN BRADLEY SLC 500 PROCESSORS COMMON PROCEDURES GUIDE ABT-1747-TSJ50 6.01

ALLEN BRADLEY 2HP DYNAMIC BRAKE UNIT 1333 / 129038 NO COVER

ALLEN BRADLEY STARTER NEMA SIZE 2 600VAC 45A 509-COD-XXX SER B

ALLEN BRADLEY MINI PLC-2/05 PROCESSOR WITH POWER SUPPLY 1772-LSP SER A REV F

ALLEN BRADLEY 800MR-M1AK SER C WOBBLE STICK SWITCH 300VAC 110-300V

ALLEN BRADLEY SLC 500 PERSONAL COMPUTER INTERFACE CONVERTER 1747-PIC SER. A

ALLEN BRADLEY 150-5 60KV CURRENT TRANSFORMER 80025-158-10

ALLEN BRADLEY 110/120 V 10 A RELAY 700-F220A1 SER. C

ALLEN BRADLEY CONTACT CARTRIDGE W/LATCH 800E-2LX20 SERIES A

ALLEN BRADLEY 6 DIFFERENTIAL INPUTS ANALOG INPUT EXPANDER MODULE 1771-E2C

ALLEN BRADLEY 1746-OG16 SLC500 TTL OUTPUT MODULE, SER C, NNB

ALLEN BRADLEY 3-POLE MANUAL RESET OVERLOAD RELAY 592-JOV16 SER. B

ALLEN BRADLEY PUSHBUTTON CONTACT BLOCK SER.A 800MR-JX2U / 800M-XAK 100160

ALLEN BRADLEY 24VDC COIL 22A CONTACTOR 100-A09NZJ3 SER. B

ALLEN BRADLEY 6.0A 690V MOTOR STARTER SWITCH 140-MN-0600 SER. B

ALLEN BRADLEY SELECTOR SWITCH  800EP-LE9 SER A

ALEN BRADLEY CIRCUIT BREAKER SERIES C 1492-SP1D010

AB BULLETIN 855T, SURFACE MOUNT AND CAP - SERIES B

ALLEN-BRADLEY Flex I/O 8-CHANNEL THERMOCOUPLE INPUT MODULE 1794-IT8 SER. A

ALLEN BRADLEY 700-PLLA24 SERIES B MECHANICAL LATCH FOR RELAY, NNB

ALLEN BRADLEY BOARD 960184 / 960177 REV-2

ALLEN BRADLEY 871U-W8K18 SERIES A 11-52 VDC INDUCTIVE PROXIMITY SENSOR,

HONEYWELL SKINNER 110/120V 10W 3/32" ORIFICE SOLENOID VALVE, V51DA1125

ALLEN BRADLEY 115-120V COIL SIZE 0 18A CONTACTOR 500-AOD93 SER. B

ALLEN BRADLEY 1792D-CB18 SERIES B 25 VDC ARMORBLOCK,

ALLEN BRADLEY 120VAC OUTPUT MODULE 1771-OD16 SER. A F/W REV. A

ALLEN BRADLEY FIBER-OPTIC SERCOS CABLE 2090-SCNP10-0 SER. A

ALLEN BRADLEY 1336-QPRE-SP1C THYRISTOR PRECHARGE

ALLEN BRADLEY ESTOP IO TERMINATION PANEL 1771HT3

ALLEN BRADLEY 700-HT22AA1 SERIES A 120VAC TIME DELAY RELAY

ALLEN BRADLEY 30A 600V FUSE BLOCK HOLDER X-401978

ALLEN BRADLEY NON-ADJ ROLLER LEVER 802T-W1E SER. B

ALLEN BRADLEY FLEX I/O SER.A REV.C01 / B01 1794-TBN 1794-IA8

ALLEN BRADLEY 10-30VDC 4 PIN PROXIMITY SENSOR 871TM-DH8CP18-D?4 SER. A

ALLEN BRADLEY FLEX I/O 24VDC INPUT MODULE 1794-IB16 SER A W/ BASE LOT OF 2

ALLEN BRADLEY SINGLE-POLE 4A CIRCUIT BREAKER 1492-CB1G040 SER. B LOT OF 10

ALLEN BRADLEY  CONTACT SER. A  595-A02

ALLEN-BRADLEY 480V 3-POLE FUSIBLE COMBINATION STARTER 512-BJB-6XP-24R SER. D

ALLEN BRADLEY 10-138VAC AC OUTPUT MODULE 1771-OAD SER. C LOT OF 3

ALLEN BRADLEY  TRANSFORMER  CT1

ALLEN BRADLEY 12-BIT ANALOG OUTPUT MODULE 1771-OFC SER. A F/W REV. F

ALLEN BRADLEY SAFETY CONTROL RELAY SERIES D CAT 700-HA32A 12

ALLEN BRADLEY 800MR-A2AR SMALL ROUND PUSH BUTTON UNIT, SERIES A,

ALLEN BRADLEY PROXIMITY SWITCH SENSOR 872C-A25N12-A2 20-250VAC 300mA

ALLEN BRADLEY CONTACTOR 100-B110N3 SER B

ALLEN BRADLEY LOGIC 5550 PROC. UNIT SER.A F/W4.42 REV.L01 1756-L1/A

ALLEN BRADLEY 1.5KW 2HP PRESET SPEED CONTROLLER 160-BA04NPS1 SER C FRN 7.04

ALLEN BRADLEY ControlLogix ANALOG I/O MODULES, USER MANUAL, NNB

ALLEN BRADLEY 24VDC SOURCE OUTPUT MODULE 1734-OB4E SER. B W/ MODULE BASE 1734-MB

ALLEN BRADLEY SERIES A, 10-30VDC, 200mA PROXIMITY SENSOR 871TM-0F1NP12-N?4

ALLEN BRADLEY 30A 600V FUSE BLOCK FOR DISCONNECT SWITCH 40116-824-11

ALLEN BRADLEY TERMINAL BLOCK 1491-HM1 LOT OF 10

ALLEN BRADLEY PALM BUTTOM 800P-F1CGA SERIES E

ALLEN BRADLEY BAR CODE DECODER 2755-DS4A-B1-R1 SER. B

ALLEN BRADLEY 2-POLE TERMINAL BLOCK 1492-H2 LOT OF 10

ALLEN BRADLEY 10HP AC DRIVE 1336S-BRF100-AA?-EN4 SER. E W/ 25 VAC/DC INTERFACE

SQUARE D 30A 600VAC 3R SAFETY SWITCH CHU361AWK

ALLEN BRADLEY PEER COMMUNICATIONS LINK INTERFACE MODULE 1784-KTK1 SER. B

ALLEN BRADLEY 24VDC COIL DRY REED RELAY 1610-T0600S24 SERIES C

ALLEN BRADLEY  120V AC POWER SUPPLY MODULE  1771-P3

ALLEN BRADLEY AC SERVO MOTOR 1326AB-B2E-11-A?5 / 126109

ALLEN BRADLEY END BARRIER SER.B , 50 IN BOX 1492-N37 102740

ALLEN BRADLEY OVERLOAD THERMAL UNIT HEATING ELEMENTS, W41,  LOT OF 3

ALLEN BRADLEY 25A 5HP CIRCUIT BREAKER SER.C 1492-CB1H250

ALLEN BRADLEY ORANGE PUSHBUTTON SER.A SER.D 800M-XAK / 800MR-PA16 100165

ALLEN BRADLEY 5HP ADJUSTABLE FREQUENCY AC DRIVE 1333-CAB SER. D+ NO COVER

ALLEN BRADLEY 1494G-BF3N NEMA HEY DUTY SAFETY SWITCH, 30 Amp REV C-D SER 1

ALLEN BRADLEY 24VAC/VDC 7W STEADY LED STACK LIGHT, 855T-B24TL3 SER. C

ALLEN BRADLEY NEMA SIZE 3 COMBINATION MOTOR CONTROLLER 512-DJB-6P-27R SER. D

ALLEN BRADLEY 2-POSITION SELECTOR SWITCH 800TJ91 SER T

ALLEN BRADLEY FLEX I/O MODULE SER.A REV.A02 1794-OB16P 99247

ALLEN BRADLEY PUSH BUTTON  800T-FXP16AA1

ALLEN BRADLEY 600VAC 10A 4NO AUXILIARY CONTACT BLOCK 100-FA40

ALLEN BRADLEY PLC-5/30 PROGRAMMABLE CONTROLLER MODULE 1785-L30B SER-C REV-H

ALLEN BRADLEY  240/480V 50/60HZ LR 29753 TRANSFORMER  X-343858

ALLEN BRADLEY 1336-B007-ECD-F?A2 CONSTANT TORQUE 3 PHASE AC DRIVE, NNB

ALLEN BRADLEY REV. 01 OPERATORS PANEL 8520-MTB2 / 160592

ALLEN BRADLEY 23-75A CLASS 20 OVERLOAD RELAY 193-A2K3 SER. A

ALLEN BRADLEY 1336-CAP-SP2A REAL PARTS 1336STG CAPACITOR ASSEMBLY,

ALLEN BRADLEY 600V 30A 3-POLE FUSE BLOCK 1494V-FS30 SER. A