23 from green to red, and an alarm is triggered with a long interval between tones. In addition, the alarm can be forwarded to the building control system via a potential-free switching contact, so that authorised persons are informed immediately. This type of alarm means there is no immediate danger, so the situation can be reviewed promptly by qualified internal personnel to initiate further measures. Reasons why the signal is triggered might include a rise in temperature during the charging process or a ventilation system failure. If the internal temperature drops again, the system returns to normal operation and the alarm goes off. The next alarm stage is triggered when smoke begins to develop, once the smoke detector reacts. The warning light remains red, the alarm triggers a medium tone interval, and the alarm is forwarded to the building control system. If the smoke detector does not detect any further smoke development inside the cabinet, then the system can be returned to normal operation by unplugging the mains voltage briefly. The last alarm stage is triggered when the temperature sensor inside the cabinet registers a temperature increase to over 70 °C, in addition to the smoke detector already triggered. The warning light switches from a red continuous light to a flashing light, and the alarm switches to a fast tone interval. In most cases, the combination of both indicators (heat and smoke) indicates a fire inside the cabinet – which triggers the fire suppression system integrated inside the cabinet itself. The technical ventilation also switches off as another protective measure, and the socket strips also turn off in lithium-ion safety storage cabinets with charging equipment. With these measures, all hazards and the fire in the cabinet are initially mitigated. In addition, the 90 minute fire resistance capability of the lithium-ion safety storage cabinets – from both inside and out – delivers valuable time: employees can be safely evacuated, fire department and rescue personnel can take additional protective measures after arriving on site. Project summary Company: Planet Monetic Location: Saint-Priest-en-Jarez, France Industry: Electronic payment systems Application: Battery storage and charging for payment terminals
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