MOTOROLA MVME2604-4331 單板機
是因為變壓器提供不出大電機啟動時所需要的大電流,如果變壓器能提供大電機啟動所需的大電流,就不會產(chǎn)生電壓降或產(chǎn)生的電壓降很小。這就是說變壓器容量的大小,也決定了電壓降的大小。那么實際當中絕不能不談變壓器容量大小,而只講多大的電機要降壓啟動。 變壓器現(xiàn)有負荷的大小,也是決定電壓降大小的條件之一。試想變壓器空載與滿載時,分別啟動同一臺電機,造成的電壓降肯定不一樣。那么只講電動機功率是變壓器容量的百分之幾,而不提變壓器現(xiàn)有負荷是多少,來判斷電機是否要降壓啟動也是行不通的。 至此,要判斷電動機是否降壓啟動,至少要考慮電動機功率、變壓器容量、現(xiàn)有負荷三個因素,缺一不可!那么看看現(xiàn)在各種所謂的判斷方法,有沒有把這三者綜合考慮呢? 如何來綜合考慮這三個因素呢?為方便均用電流這個參數(shù)。其實這個問題的實質(zhì)是:多大的電流?會造成多大的電壓降?也就是電流與電壓降的問題。
It is because transformers cannot provide the large current required for starting a large motor. If transformers can provide the large current required for starting a large motor, there will be no voltage drop or a very small voltage drop. This means that the capacity of the transformer also determines the magnitude of the voltage drop. So in practice, we cannot ignore the size of the transformer capacity and only talk about the size of the motor that needs to be started with voltage reduction.
The current load of a transformer is also one of the conditions that determine the magnitude of voltage drop. Imagine the voltage drop caused by starting the same motor separately when the transformer is unloaded and fully loaded. So it is not feasible to determine whether the motor needs to be started by reducing voltage by only stating that the motor power is a percentage of the transformer capacity, without mentioning the current load of the transformer.
At this point, to determine whether the motor is starting with reduced voltage, at least three factors must be considered: motor power, transformer capacity, and existing load, none of which are indispensable! So let's take a look at the various so-called judgment methods nowadays, have they considered these three factors comprehensively?
How to comprehensively consider these three factors? For the convenience of using the current parameter uniformly. The essence of this question is: what is the current? How much voltage drop will it cause? That is, the issue of current and voltage drop.
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ABB:
086370-001
086444-005
129740-002
216AB61 HESG324013R100 HESG216881B
216DB61 HESG324063R100/J
GE:
UR9EH
V7768-322001
VME-7807
DS200DCFBG1BLC
IC693ALG392C
A-B:
1756-L81
2711P-T15C22D9P
80190-240-02-R
80190-560-02-R
80190-600-01-R
BENTLY:
3500/42 125672-02
3500/42M 176449-02大卡
3500/53-03-00(133388-01+133396-01)
1900/55
125840-02
WOODWARD:
5466-1035
8200-1508
8200-225
8200-4006
EASYGEN-3200-5
HONEYWELL:
FS-QPP-0002
CC-IP0101 51410056-175
05704-A-0145
FC-TSAI-1620M
WEB-600E
EMERSON:
CE3007MX2
VE3007 KJ2005X1-BA1
SE3008 KJ2005X1-MQ2 13P0072X082
DXA-205
A3125/022-020
FOXBORO:
A4H124-24TX P0973JM
FCP280 RH924YA
H92(H92804CC0500)
P0973JP
PO973LN
HIMA:
F8650X 984865065
F6217 984621702
ELOP II-PROF
F8652E 984865264
X-AI 32 01 985210213
TRICONEX:
3009X
3351
3902AX
PLM 3900N
3721-C1
MOTOROLA:
MVME5500-0161
MVME55006E-0161R
VMIVME 2540-000
MVME374-001
MVME147-014A
EMERSON:
A3125/022-020
WH5-2FF 1X00416H01
A6120 9199-00002
A6500-UM
5X00589G07
ELAU:
MAX-4/11/03/128/08/1/1/00
MC-4/11/22/400 VDM01D22AQ00
SM100/40/050/P0/45/S1/B0
VIA0702D02A0000 ISH070/60017/0/0/00/0/00/10/00
VPM02D20AA00
YASKAWA:
CLSR-33-N2CC
CLSR-CB-1CN2AY1