Presentation on theme: "The Essential EssentialComponent. No Audio, Lighting or Video System operates without Electricity, but we take its delivery, distribution and control."— Presentation transcript:
The Essential EssentialComponent
No Audio, Lighting or Video System operates without Electricity, but we take its delivery, distribution and control for granted, we think it’s just there at the flip of a switch. That SWITCH is the Essential Component in the system, that SWITCH can be the most vulnerable part determining the reliability of the system as a whole, that SWITCH is much more than ON/OFF.
You’re Doing it Wrong When: You use a typical Circuit Breaker as your ON/OFF Control. You use a modified dimming system. You use Solid State Relays instead of latching Electro Mechanical Relays.
Why Not Circuit Breakers? The main purpose of a circuit breaker is for protection from overload and short-circuits. Continual turning off and on of a non-rated breaker weakens the internal mechanism and reduces its protection capability. In most cases, circuit breakers are only expected to be manually operated to facilitate maintenance and repair type activities. Only SWD Rated circuit breaker should be used as a switch.
Integrating Power Control into the Dimming System is a Disaster Waiting to Happen. A dimmer circuit attempting to act as an On/Off control is not fully isolated and the potential for a fused short circuit increases. With the same ease as setting up the dimming system to have some On/Off control, an inadvertent change made by an operator could change the status of that channel. The result is damaged power supplies of units not intended to be dimmed.
Aren’t All Relays Alike? SSRs (Sold State Relay) nearly always fail shorted leaving the circuit powered on. SSRs are semiconductors and are never completely switched off. In the on-state, substantial resistance is present generating heat at the SSR. This heat requires extensive thermal management and large heat sinks. When exposed to surges or spikes SSRs may conduct for as much as one half-cycle after the surge has stopped. Most SSRs require a minimum load or they won't function.
Aren’t All Relays Alike? ( cont. ) Electro Mechanical Relay (EMRs) can switch a load up to the full rating. EMRs are either electrically or mechanically held. Mechanically held relays are also called “Latching Relays” and do not require power to hold state. EMR contact resistance is very low, eliminating any need for heatsinking. EMRs have total line-to-load isolation. If an EMR does fail it will “fail-open”, a generally safer state.
You’re Doing it Right When: Your Power Management is a rated, mechanically held, component dedicated to AC Power Sequencing, Distribution and Monitoring. Your AC Power can be CONTROLLED ( via DMX, TCP/IP, ACN, Serial Data, etc.) You create a State of Readiness prior to use of your equipment. You lower the risk of power supply damage of Sound, Light and Video equipment by completely isolating it from the power source. You don’t use Energy to Manage Energy.