制動周期的計算有時候簡略紊亂。實踐上，5%制動周期就意味著制動電阻可以在12秒鐘內(nèi)消耗100%的功率，然后需求冷卻228秒鐘。當然假設(shè)制動的時間小于12秒鐘，或許消耗的功率低于100%是其他一種情況，變頻器會計算制動電阻的i2t。假設(shè)制動周期大于5％，440容許設(shè)置較高的制動周期，但實踐上很難精確地計算出制動的情況。比方說，一臺變頻器每分鐘制動5秒鐘，制動功率50%。在這種情況下，通常主張選擇比理論計算稍大一些的電阻，一同在參數(shù)P1237中相應地設(shè)置高一些的制動周期。
1、繞組接地缺點。在三相繞組中，有一處或多處絕緣損壞，使繞組中的鐵心、機座相碰，并使電流與機座相通，這么的缺點稱為繞組接地缺點。
2、缺點表現(xiàn)。繞組接地時，假設(shè)變頻調(diào)速電機外殼沒有接中性線或外殼的維護接地欠好，機座會帶電，用驗電筆檢驗，能看到驗電筆發(fā)光。若用手背剎那間觸碰機座，則會被電擊而感到手臂麻目，還或許會使變頻調(diào)速電機在工作中發(fā)作失常響聲、振動和過熱等景象，嚴峻時使變頻調(diào)速電機不能起動。
3、繞組接地的影響。繞組發(fā)作接地缺點后，如變頻調(diào)速電機外殼維護接地不良機座會帶電。雖然變頻調(diào)速電機還能工作，當人體觸碰機座，電流就會進過人體與大地構(gòu)成回路，對人的生命有危險。當一相繞組中有一處接地時，該接地址就與機座構(gòu)成回路，使相繞組的線圈匝數(shù)減少，因而使相電流增加，致使三相電流不平衡。當一相繞組中有兩處一同接地時，該繞組接地的兩處之間被鐵心、機座短路。短路的線圈匝數(shù)越多，相電流增加就越大。若兩相繞組有兩處一同接地，會引起相間短路，焚毀線圈，甚至使變頻調(diào)速電機不能起動工作。
TURCK BL20-16DI-24VDC-P 1
ULTRA SLIMPAK G428-0001 1
UNIOP ELT-VGA-0045 1
VALMET CPR1 A413280 1
VALMET A413045 3
VALMET 421907-1B 1
VALMET A413052 1
VALMET 421907-1B 2
VEXTA A3897-9412 1
VEXTA PH266-01GK-C5 1
VISHAY 120NQ045R 4
VMIC VMIVME Model 2533 Assy No 332-002533-010E 1
VMIC ZT5524A1A 1
VWR SCIENTIFIC MODEL 3000 1
WEIDMULLER 836598 1
WEIDMULLER 844495000 1
WEIDMULLER 8533640000 1
WEIDMULLER 844725 2
WEIDMULLER 8540180000 1
WEIDMULLER 8560740000 1
WEIDMULLER 860736000 1
WEIDMULLER 8690880000 1
WEIDMULLER V23057-B3028-A101 1
WEIDMULLER 0302860000 40
WEIDMULLER 7940005785 1
WEIDMULLER 7901620000 1
WEISTINGHOUSE 1C31238H01 1
WEISTINGHOUSE 1C31238H01 1
WEISTINGHOUSE 1C31234G01 2
WEISTINGHOUSE 1C31227GO1 2
WEISTINGHOUSE 1C31238H01 1
WEISTINGHOUSE 1C31234G01 3
WEISTINGHOUSE 1C31227G01 2
WEISTINGHOUSE 1C31224GO1 1
WEISTINGHOUSE 1C31224G01 3
WEISTINGHOUSE 1C31233G04 1
WEISTINGHOUSE 5X00167G01 2
WEISTINGHOUSE 1C31127G01 2
WEISTINGHOUSE 1C31125G02 2
WEISTINGHOUSE 1C31116G04 2
WEISTINGHOUSE 1B30023H01 2
WEISTINGHOUSE 1C31132G01 1
WEISTINGHOUSE 5X00321G01 2
WESTINGHOUSE 3A99158G01 19
WESTINGHOUSE ST24B3 12
WESTINGHOUSE AID-1(西屋鍵盤) 5
WESTINGHOUSE 5A26391H24 9
WESTINGHOUSE 3A99132G01 2
WESTINGHOUSE 3A99132G02 8
WESTINGHOUSE 1C31234G01 5
WESTINGHOUSE 1C31234G01 3
WESTINGHOUSE 1C31234G01 2
WESTINGHOUSE 4D33942G01 6
WESTINGHOUSE 3A99200G01 6
WESTINGHOUSE 1C31234G01 55
WESTINGHOUSE 1X00024H01 1
WESTINGHOUSE 5X00119G01 1
WESTINGHOUSE 1X00024H01 3
WESTINGHOUSE 1X00416H01 1
WESTINGHOUSE ZX345Q 8
WESTINGHOUSE 5X00241G01 2
WESTINGHOUSE 5X00226G02 2
WESTINGHOUSE 5X00119G01 1
WESTINGHOUSE 1C31238H01 2
WESTINGHOUSE 1C31238H01 4
WESTINGHOUSE 1C31238H01 3
WESTINGHOUSE 1C31238H01 2
WESTINGHOUSE 5X00105G14 1
WESTINGHOUSE 5X00105G01 2
WESTINGHOUSE 5X00059G01 2
WESTINGHOUSE 5X00058G01 2
WESTINGHOUSE 1C31234G01 4
WESTINGHOUSE 1C31224G01 3
WESTINGHOUSE 1C31161G02 45
WESTINGHOUSE 1C31150G01 4
WESTINGHOUSE 1C31147G01 4
WESTINGHOUSE 1C31197G01 2
WESTINGHOUSE 1C31203G01 1
WESTINGHOUSE 1C31204G01 1
WESTINGHOUSE 1C31164G02 59
WESTINGHOUSE 1C31132G01 2
WESTINGHOUSE 1C31224G01 13
WESTINGHOUSE 1C31224G01 2
WESTINGHOUSE 1C31224G01 2
WESTINGHOUSE 1C31224G01 4
WESTINGHOUSE 1C31132G01 1
WESTINGHOUSE 1C31132G01 9
WESTINGHOUSE 1C31189G01 1
WESTINGHOUSE 1C31194G01 2
WESTINGHOUSE 1C31194G01 1
WESTINGHOUSE 1C31192G01 2
WESTINGHOUSE 1C31192G01 1
WESTINGHOUSE 1C31189G01 2
WESTINGHOUSE 1C31166G01 1
WESTINGHOUSE 1C31179G02 1
WESTINGHOUSE 1C31194G02 3
WESTINGHOUSE 1C31169G02 1
WESTINGHOUSE 1C31194G03 2
WESTINGHOUSE 1C31197G01 2
WESTINGHOUSE 1C31166G01 1
WESTINGHOUSE 1C31113G02 31
WESTINGHOUSE 1C31125G02 1
WESTINGHOUSE 1C31227G01 2
WESTINGHOUSE 1C31227G01 2
WESTINGHOUSE 1B30035H01 3
WESTINGHOUSE 1C31227G01 4
WESTINGHOUSE 1C31129G03 2
WESTINGHOUSE 1C31227G01 1
WESTINGHOUSE 1C31227G02 2
WESTINGHOUSE 1C31125G02 42
WESTINGHOUSE 1C31122G01 1
WESTINGHOUSE 1C31122G01 30
WESTINGHOUSE 1C31116G04 17
WESTINGHOUSE 1B30023H01 4
WESTINGHOUSE 1B30035H01 72
WESTINGHOUSE 1C31129G03 2
WESTINGHOUSE 1C31227G01 52
WESTINGHOUSE 1B30035H01 2
WESTINGHOUSE 1C31129G03 12
WESTINGHOUSE 1C31132G01 1
WESTINGHOUSE 1B30035H01 2
WESTOVER SCIENTIFIC FM-C200 1
WOHNER 31110 1
WOODHEAD 5136-PFB-VME 1
WOODWARD 5464-414 1
WOODWARD 9907-175 1
WOODWARD 9907-164 1
WOODWARD 9907-164 1
WOODWARD 9907-028 1
WOODWARD 9907-252 1
WOODWARD 2301A /9905-020 1
WOODWARD 9907-162 1
XANTREX XFR40-30 1
XANTREX XFR40-70 1
XANTREX XFR 20-130 1
XYCOM XVME-653 0
XYCOM XVME-530 1
XYCOM XVME-976 1
XYCOM Proto XVME-085 1
YAMAHA RCX40 1
YAMATAKE HD-CAOBS00 3
YASKAWA JGSM-06 1
YASKAWA CACR-HR10BB 1
YASKAWA AI-01 1
YASKAWA JRMSP-P8101 1
YASKAWA JRMSI-B1026 1
YASKAWA CIMR-M5D2018 1
YASKAWA JEPMC-PC040 1
YASKAWA JEPMC-MC001 1
YASKAWA JEPMC-CP210T2V 1
YASKAWA JANCD-XCP01-1 1
YASKAWA JANCD-PC51 1
YASKAWA JANCD-MSV01B 1
YASKAWA JANCD-MIF01 1
YASKAWA JANCD-MCP02B-1 1
YASKAWA PS-02 1
YASKAWA LASC-100SUB 1
YASKAWA CP-9200SH/SVA 1
YASKAWA NPSO-0503L 1
YASKAWA MB-01 1
YASKAWA LIO-01 2
YASKAWA LI0-01 1
YASKAWA LASC-100W8 1
YASKAWA PS-01 2
YASKAWA JZNC-XPP02B 1
YASKAWA JZNC-XIU01B 1
YASKAWA JZNC-MRK12-1E 1
YASKAWA JUSP-WS15AB 1
YASKAWA DI-01 7
YASKAWA JUSP-NS300 1
YASKAWA CP-9200SH/CPU 4
YASKAWA SGMAH-02AAA21 2
Yaskawa JZNC-XPP02B 1
YASKAWA JACP-317900 1
YASKAWA JANCD-JSP04-1 1
YASKAWA JAMSC-B1050 3
YASKAWA JAMSC-B1063 1
YASKAWA JAMSC-B1070 1
YASKAWA SJDE-04ANA-OY 1
YASKAWA JAMSC-B1071 1
YASKAWA JANCD-CP50B 1
YASKAWA JACP-317900 1
YASKAWA SGDS-08A01A 1
YASKAWA JAMSC-C8120 1
YASKAWA JAMSI-B1031 1
YASKAWA CPS-18F8 1
YASKAWA JAMSC-C8160 1
YASKAWA CP-9200SH/CPU 2
YASKAWA CP-9200SH/SVA 1
YASKAWA CP-9200SH/SVA 1
YASKAWA CP-9200SH/SVA 7
