Charlotte Hall is a for-profit corporation, owned by HMR of Maryland LLC, and managed by HMR Veterans Services Inc. The U.S. Department of Veterans Affairs helps make this facility affordable to veterans with per diem subsidies that - according to Charlotte Hall - save its nursing home residents over $3,000 a month.
Typically the relay will operate a switch (relay contact) to indicate that an input has surpassed a setting, or the relay can provide notification through visual feedback such as a meter or LED. One advantage of electronic or microprocessor relays is an ability to communicate with a network or a PLC. As an example, a thermostat can be evaluated using the diagram in Figure 1. The input that is measured is temperature and the protection relay input device is the temperature sensor. The user sets the desired temperature setting (pick-up level). The relay measures the existing air temperature and compares it to the setting.
A mechanical relay does this through the use of an electromagnet-a magnet that is only on when there's power running through it-that pulls a set of spring loaded contacts to make or break the connection and achieve the on-off effect.t's a electrical device that functions something like a wired remote control switch. Instead of having the switch you push/flip/whatever do the work of supplying power to whatever you wanted it to, you have it control a relay which then does the real on/off switching work. That's it.