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40PB3209A模擬量輸出模塊
外殼SMC Flex控制器的開放式設(shè)計(jì)要求將其安裝在圍墻。外殼內(nèi)部溫度必須保持在范圍為0…50°C。
對于12型（IP54）外殼，表6中所示的指南如下建議限制控制器的最高環(huán)境溫度。
頂部和底部至少應(yīng)有15 cm（6 in.）的間隙控制器。該區(qū)域允許空氣流過散熱器。所有裝置均采用風(fēng)扇冷卻。將控制器定位在某個位置很重要允許空氣垂直流過電源模塊。控制器必須安裝在垂直平面上，且最小自由距離為15 cm（6 in.）控制器上方和下方的空間。
在軟起動器附近鉆孔或安裝時，確保足夠采取措施保護(hù)設(shè)備免受灰塵和碎屑的影響。見圖27功率因數(shù)校正電容器控制器可以安裝在具有功率因數(shù)校正的系統(tǒng)上電容器（PFCC）。電容器必須位于控制器。必須這樣做，以防止損壞SMC Flex中的SCR控制器。
電容器放電時，阻抗基本為零。對于開關(guān)，應(yīng)串聯(lián)足夠的阻抗電容器組以限制浪涌電流。
一種限制浪涌的方法電流會增加電容器導(dǎo)體的電感。
這可以是通過在與電容器。
?250V-15 cm（6 in.）直徑線圈，6個回路
?480…690V-15 cm（6 in.）直徑線圈，8個回路安裝線圈時要小心，以免線圈直接堆放在彼此疊加會產(chǎn)生抵消效果。將線圈安裝在絕緣材料上支架遠(yuǎn)離金屬部件，因此它們不會用作感應(yīng)加熱器。如果使用隔離接觸器，在接觸器前放置電容器。
有關(guān)更多說明，請咨詢PFCC供應(yīng)商。可以安裝包含金屬氧化物壓敏電阻（MOV）的保護(hù)模塊在額定值為5…1250 A和200…600V的控制器上，以保護(hù)電源電氣瞬變的部件。保護(hù)模塊夾電壓線路上產(chǎn)生的瞬變，以防止此類浪涌損壞SCR。
雙速電機(jī)SMC Flex控制器具有單速過載保護(hù)電機(jī)。當(dāng)SMC Flex控制器應(yīng)用于雙速電機(jī)時Overload Class（過載等級）參數(shù)必須編程為OFF（關(guān)閉）并單獨(dú)過載必須為每個速度提供繼電器。
Enclosures
The open-style design of the SMC Flex controller requires that it be installed in an enclosure. The internal temperature of the enclosure must be kept within the range of 0…50°C. For Type 12 (IP54) enclosures, the guidelines that are shown in Table 6 are recommended to limit the maximum controller ambient temperature. There should be a clearance of at least 15 cm (6 in.) above and below the controller. This area allows air to flow through the heatsink.
All units are fan cooled. It is important to locate the controller in a position that allows air to flow vertically through the power module. The controller must be mounted in a vertical plane and have a minimum of 15 cm (6 in.) free space above and below the controller. When drilling or installing near the soft starter, make sure that adequate measures are taken to protect the device from dust and debris. SeeFigure 27.
Two-speed Motors The SMC Flex controller has overload protection available for single speed motors. When the SMC Flex controller is applied to a two-speed motor, the Overload Class parameter must be programmed to OFF and separate overload relays must be provided for each speed.
Power Factor Correction Capacitors
The controller can be installed on a system with power factor correction capacitors (PFCCs). The capacitors must be located on the line side of the controller. This must be done to prevent damage to the SCRs in the SMC Flex controller. When it is discharged, a capacitor essentially has zero impedance. For switching, sufficient impedance should be connected in series with the capacitor bank to limit the inrush current. One method for limiting the surge current is to add inductance in the capacitor’s conductors. This can be accomplished by creating turns or coils in the power connections to the capacitors. ? 250V — 15 cm (6 in.) diameter coil, 6 loops ? 480…690V — 15 cm (6 in.) diameter coil, 8 loops Take care in mounting the coils so that they are not stacked directly on top of each other; stacking causes a canceling effect. Mount the coils on insulated supports away from metal parts so they will not act as induction heaters. If an isolation contactor is used, put capacitors in front of contactor. For further instructions, consult the PFCC vendor.Protective modules containing metal oxide varistors (MOVs) can be installed on controllers rated 5…1250 A and 200…600V, to protect the power components from electrical transients. The protective modules clip voltage transients generated on the lines to prevent such surges from damaging the SCRs.
