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在电动机运行时按停止按钮SB2，它的常闭触点断开，使KM的线圈失电，KM的主触点断开，异步电动机的三相电源被切断，电动机停止运行i同时控制电路中KM的辅助常开触点断开。当停止按钮SB2被放开，其常闭触点闭合后，KM的线圈仍然失电，电动机继续保持停止运行状态。图1.3给出了有关信号的波形图，图中用高电平表示1状态(线圈通电、按钮被按下)，用低电平表示0状态(线圈断电、按钮被放开)。
图1.3中的控制电路在继电器系统和PLC的梯形图中被大量使用，它被称为“起动-保持-停止”电路，或简称为“起保停”电路。
FAG HCS7016-E-T-P4S-UL
SICK LCU-V343
Siemens 3SB4003-0AB40-5
Sawa-Tauchkreiselpumpe ZAT 14-40/32-Z-50
Sasse Elektronik PHMI 8A Ord.-Nr. 1360.9915201
SICK Sender FGSS1350-21 & Empfnger FGSE1350-21
italvibras CDX 15/900-G/D
Stber Servomotor ES72 000364268 mit Getriebe P501PV0040ES72
Indramat Servomotor MDD090B-N-020-N2L-110PBO
Indramat Servomotor MKDO71B-061-KG1-KN
Parker COMPAX-SL
VERMES Technik MDC 3090A-L
YAMATAKE C315GA040500
Allen Bradley MPL-B420P-MK24AA+Stber GetriebePA421SPD0100MF
Allen Bradley MPL-B420P-MK22AA+Stber Getriebe P522SPRO200ME
Stber Servomotor ED401UROS140+Getriebe P522SPZ1000MEED401U
Allen Bradley MPL-B420P-MK24AA+Stber Getriebe P522SPRO500ME
SEW Eurodrive FH37 CMP71S/BM//KY/AKOH/SB1
Klckner 620-1633+Power Supply 620-0041
Siemens 1FK7063-5AH71-1KH0-Z
Rexroth Servomotor SR-A2.00.0041.030-00.000
Parker PSS 3032 KO 20E/2AZ/10A 301350
Siemens SIMODRIVE 6SN1123-1AA00-0BA2 E: A + 6SN1118-1NH01-0AA0
SEW Eurodrive FH67B/R CM71L/KTY/AKOH/***60
ESR Pollmeier BN6617.1542.1285
SEW-Eurodrive PSF511/N/EK04CM71L/BR/TF/VR/ES1H/S***
Bosch SD-B4.070.030-15.000
Siemens 1FK7033-7AK71-1AGO
ABB LD630EGR6000-Z
Indramat MDD090B-N-020-N2L-110PAO
Indramat MDD090B-N-020-N2M-110PAO
Indramat MAC 112D-0-EO-2-HC/130-A-0
Indramat MKDO 71B-061-KGO-KN
MIYACHI UNITEK HF2/208 1-264-03-03
Siemens 1HU3076-0AC01-OZZ9-Z
Bosch SD-B3.068.030-10.000
Siemens 1FT 5024 0AF019-Z
Fanuc 20S A06B-0502-B233
BOSCH SD-B4.180.020.-00.000 (913870)
Indramat MDD090B-N-020-N2L-110PAO
Indramat MDD093B-N-030-N2L-110GA1
Cloos CK118 RKSD CDD
SEW Eurodrive KF 37 CMP63S/KY/RH1M/***10
Siemens WF726C 6FM1726-3CA10
Bosch EBX 200 EBX200-T 054914-109 DC520V
Metalwork 543211871300
Siemens MXF461.15-3.0
319100-0200B319100-0200B319100-0200B319100-0200B