选用变频器的类型，按照生产机械的类型、调速范围、静态速度精度、起动转矩的要求，决定选用那种控制方式的变频器合适。所谓合适是既要好用，又要经济，以满足工艺和生产的基本条件和要求
需要控制的电机及变频器自身
1）电机的数。一般电机数以不多于(为宜，否则变频器容量就要适当加大。
2）转矩特性、临界转矩、加速转矩。在同等电机功率情况下，相对于高过载转矩模式，变频器规格可以降额选取。3）电磁兼容性。为减少主电源干扰，使用时可在中间电路或变频器输入电路中增加电抗器，或安装前置隔离变压器。一般当电机与变频器距离超过50m时，应在它们中间串入电抗器、滤波器或采用屏蔽防护电缆
变频器功率的选用
系统效率等于变频器效率与电动机效率的乘积，只有两者都处在较高的效率下工作时，则系统效率才较高。从效率角度出发，在选用变频器功率时，要注意以下几点：
1）变频器功率值与电动机功率值相当时合适，以利变频器在高的效率值下运转。
2）在变频器的功率分级与电动机功率分级不相则变频器的功率要尽可能接近电动机的功率，但应略大于电动机的功率。
3）当电动机属频繁起动、制动工作或处于重载起动且较频繁工作时，可选取大一级的变频器，以利用变频器长期、地运行。
4）经测试，电动机实际功率确实有富余，可以考虑选用功率小于电动机功率的变频器，但要注意瞬时峰值电流是否会造成过电流保护动作。
5）当变频器与电动机功率不相则相应调整节能程序的设置，以利达到较高的节能效果
Pipe Bender & Guide Heavy Duty (MS124)
PIPE BENDER
pipe bender
Pines Tube Bender Dial-A-Bend Control Parts
Pines Tube Bender Dial-A-Bend Control Parts
Pines Tube Bender Dial-A-Bend Control Parts
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Pines Hydraulic Tube Bender Control Parts Dial-A-Bend, Leonard,PHI,
Pines Bender, Technology Hydraulic Rotary Machine, OwnersOperations Manual 1996
Pines Bender, Hydraulic Rotary Owner Operation Schematics Parts& Tooling Manual
PINES BENDER SAFETY CIRCUIT BOARD 177-93-995-08
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PINES BENDER CIRCUIT BOARD LOT
PINES BENDER CIRCUIT BOARD 177-93-995-04 Rev. 0
PINES BENDER CIRCUIT BOARD 177-93-995-01
PINES BENDER CIRCUIT BOARD 177-93-995-01 Rev. D
PINES BENDER CIRCUIT BOARD 160-93-995-09
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Pines 3T Tube Bender
Pines #4 w/ #3 Cylinder Tube Bender Operator Manual
Pines #3 Tube Bender, Operators owner Manual 1948
PINES #2 hydraulic Tube Bender mandrel extractor eaton leonardcrippa addison
PINES #2 High Speed Tube Bender w mandrel extractor, 1979 w updated controls
Pines #2 Bender Safety Guard NOS (PHI, Conrac, Leonard)
Pines #1 LH Bender Safety Guard NOS (PHI, Conrac, Leonard)
Pines #1 Bender Safety Guard (PHI, Conrac, Leonard) a
PINES # 1 (PR Machinery) Hydraulic Tube Pipe Bender with Leonardside winder
PIN WELDER / BENDER AUTOMATED MODEL 1BV w/ UNITEK SERIES 180THIN LINE WELDER
PHI Bender Control (Pines,Conrac, Leonard)
PHI 210 RH HYDRAULIC TUBE BENDER 1 1/2" 120" MAX TUB LENGTH, 8"MAX RADIUS 5 Hp
Pexto slip roller rolls roll former tube ring cone bender381d
Pexto 36" Bar Folder w/Cheek Bender Attachment peck stow andWilcox
PEXTO - ROPER WHITNEY HAND SEAMER SHEET METAL BENDER TOOL HVACFABRICATION
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Pedrick B 10 Tube Pipe Flats Bender Rotary Compression CNC DiesPrice Lowered
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PECO 3/4" E.M.T. Conduit Bender Electrical Contractor ~Electricians Tool #639
PBB04 SEALEY METAL BENDER BENCH MOUNTING [Benders, Metal MetalBenders] !
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PARKER Tubibg/Conduit Bender No. 10-2829 5/8" O.D.
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Parker / Lakeland #6 3/8" OD Tube Bender Slide Block 5"Long
Parker / Lakeland #6 3/8" OD Tube Bender Clamp Block
PARKER & IMPERIAL HANDTUBE BENDERS
Pair of KBS Rollobend Long Radius Tube Benders #8100 1/2" - 5" R& # 4100 1/4"
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