Proportional control is used in practically every instance where accurate temperature control is required.

This means that power is applied to heating elements in short bursts of energy, their duration being proportional to the amount of heating energy required to maintain a constant temperature.

To achieve this accurate control, power is applied to the elements using solid state devices such as thyristors or solid state relays.

It is not uncommon for these devices to fail (and indeed electro-mechanical if used).

Unfortunately this failure generally results in a short circuit condition, applying full continuous uncontrolled power to the heating element, with sometimes-disastrous results to machine, product and even human operators.

This problem is common on Plastic Injection Moulding machinery, particulary in the injection heater zone area.

The ideal way to prevent damage as described above would be to monitor the power being applied to the heating elements and quickly detect when an abnormal situation occurs, and take appropriate action.

Zone Monitor

To implement this solution, an intelligent monitoring device is required. It must be capable of:

• Settable initial start-up period where power is applied permanently for a certain period
• Variation of start-up time period
• Visual indication of heater element power status
• Auto disconnect element upon fault condition
• Visual fault indication
• Audible fault indication
• Element circuit override option
• Functional over a wide heater element operation voltage
• Multiple element monitoring – zones
• Simple to set-up and operate
• Very low maintenance
• Serviceable

The ACE 5 Zone Power Monitor does all of the above and more. Using state-of-the-art microprocessor technology and superb software.

• Initial set-up period, known a STANDBY TIME adjustable to 0;20;30 minutes. During this period, the monitor will not enter the alarm state

• A built-in audible alarm alerts the operator

• External fault contact activates upon fault detection – can be wired to remote enunciator

• Heater element is disconnected from faulty power supply – solving overheating problems

• Monitor up to five zones simultaneously

• Large very visible fault indicator for each zone

• Individual zone override switch for serviceability

• Easily connected. 16 amp capacity per zone. Can be easily interfaced to handle larger currents

• Easily accessible connection terminals on back of unit

Wherever proportional control is used – not necessary for use on heating devices only.

Very.

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