SSI America user manual Model 9200 Programmable Dual-loop Controller

Model 9200 Programmable Dual-loop Controller

Safety

•Safety Symbols - Various symbols are used on the instrument, they have the following meaning:

!Caution (refer to the accompanying documents)

Instrument Power

The Model 9200 is designed as a low voltage instrument, getting the 24VDC power through a UL/CE marked universal power supply.

Where damage or injury is possible, we recommend fitting a separate over-temperature protection unit, with an independent temperature sensor, which will isolate the heating circuit. Please note that the alarm relays within the controller will not give protection under all failure conditions.

•Grounding of the temperature sensor shield - In some installations it is common practice to replace the temperature sensor while the controller is still powered up. Under these conditions, as additional protection against electric shock, we recommend that the shield of the temperature sensor be grounded. Do not rely on grounding through the framework of the machine.

•Installation requirements for EMC - To ensure compliance with the European EMC directive certain installation precautions are necessary. When using relay or triac outputs it may be necessary to fit a filter suitable for suppressing the emissions. The filter requirements will depend on t he type of load. For typical applications we recommend Schaffner FN321 or FN612.

•Routing of wires - To minimize the pick-up of electrical noise, the wiring for low voltage DC and particularly the sensor input should be routed away from high-current power cables. Where it is impractical to do this, use shielded cables with the shield grounded at one end.

SSi Manual SERIES 9200 4 Programmable Dual-loop