SCR490D工业自动化与控制的监控器-继电器输出规格书PDF中文资料

SCR490D属于工业自动化与控制的监控器-继电器输出。由力特公司制造生产的SCR490D监控器 - 继电器输出继电器输出监控器检测工业继电器的异常输出，并触发逻辑输出或触头组。常见的检测类型包括：AC 和 DC 电流或电压、电压不对称、接地故障、温度监控、缺相，以及相位序列或不平衡。这些器件可根据跳闸范围、延迟时间、供电电压、安装类型和开关电路进行选择。

描述 Description

The SCR490D is used to provide remote monitoring of steady

burning incandescent marker and obstruction lighting. Four

onboard switches allow operator programming for lighting

systems with two through nine lamps on a single AC circuit. The

SCR490D uses a toroidal sensor and electronic circuitry to sense

the failure of one or more lamps.

Operation

When a lamp fails, the SCR490D senses a decrease in current

flow. Then, after a fixed time delay, it transfers to its alarm mode.

In alarm mode, the LED indicator, the output relay (SPDT

isolated contacts), and a non-isolated solid-state output are

energized. Replacement of the failed lamps resets the alarm

outputs and the LED indicator. To prevent false alarm signals,

power must be applied to the SCR490D at the same time that

lamps are energized.