METRIX振动开关450DR-2144-0100技术参数
Series | 450 |
Number of Alarm Setpoints | DR = Two alarm setpoints |
Analog Proportional Output | 2 = 4-20 mA(absolute) |
Scale Range | 1 = 0.2 – 3.0 in/sec (derived peak) |
Shutdown Circuit Output | 4 = Electromechanical relay (10A, SPDT) |
Alarm Circuit Output | 4 = Electromechanical relay (10A, SPDT) |
Housing / Approvals | 0 = Standard NEMA 4 housing (4-hole pattern) |
Input Power | 1 = 230 Vac, 50/60 Hz |
Power-up Timed Inhibit (i.e., LOCKOUT) | 0 = None |
Transducer Option | 0 = Internal Accelerometer |
METRIX振动开关450系列介绍
该电子开关采用固态晶体加速度计，当其受到振动力作用而发生形变时，会产生电信号输出。该输出信号经电子转换后，与速度成正比。该信号与预设限值进行比较，若超过限值，则触发固态继电器。除与机械继电器配置的情况外，440型振动开关中没有其他运动部件。
该开关的一项重要特性是内置延时功能。这可以防止因振动水平的瞬时升高而触发报警或关机功能。它还可以避免因启动过程中发生的瞬时振动而导致关机。
几乎所有机器在启动时都会经历几秒钟的剧烈振动，之后才会达到运行速度。如果像机械开关那样没有延时功能，这种启动振动会导致跳闸。通常情况下，操作员会不断调整跳闸设置，直到能够完成启动。但这样一来，跳闸阈值过高，无法在机器的运行速度下提供足够的保护。
该开关的标准报警跳闸延迟时间为三秒。报警延迟时间可在现场独立调节，调节范围为 2 至 15 秒。
The electronic switch utilizes a solid state crystal accelerometer which provides an electrical output when it is deformed by the vibration forces. The output is electronically converted to a signal proportional to velocity. This signal is compared with a preset limit and triggers a solid state relay if the limit is exceeded. There are no moving parts in the 440 vibration switches except when configured with mechanical relays.
An important feature of the switch is the built-in time delay. This prevents triggering of the alarm or shutdown functions from transient increases in vibration levels. It also avoids shutdown due to transitory vibrations occurring during start-up.
Almost all machines experience a few seconds of high vibration during start-up before reaching operating speed. When no time delay function is included, as with mechanical switches, this start-up vibration causes a trip. Frequently, the operator turns the trip setting up until he can get through start-up. The resultant trip level is too high to afford protection at the machine’s operating speed.
Three-second alarm trip delay is standard on the switch. Alarm time delays are independently adjustable in the field over a range of 2 to 15 seconds.
METRIX振动开关450系列选型
METRIX振动开关450系列其他常用型号：
METRIX 450DR-2022-0200
METRIX 450DR-2222-0100
METRIX 450DR-2122-0100
METRIX 450DR-2222-9120
METRIX 450DR-2144-0100
METRIX 450DR-2122-0000
METRIX 450DR-2044-0100
METRIX vibration switch NEW + ORIGINAL+ ONE YEAR WARRANTY
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METRIX振动开关450系列450DR-2144-0100技术参数及介绍
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