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M4557 - Model 9210 Nitriding Controller
SSi Manual SERIES 9210-M4557-Nitriding Page 4 of 4
Safety
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Safety Symbols
- Various symbols are used on the instrument, they have the following meaning:
Caution (refer to the accompanying documents)
Functional earth (ground) terminal
The functional earth connection is required for safety purposes and to ground RFI filters.
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Personnel
- Installation must only be carried out by technically qualified personnel.
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Enclosure of live parts
- To prevent hands or metal tools from touching parts that may be electrically
live (powered), the controller must be installed in an enclosure.
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Caution: Live sensors
- Do not connect live (powered) sensors to any signal input on the controller. Live
sensors are sensors that must be connected to the main's supply. The controller has transient
protection circuits connected between the inputs and the earth connection, which might be damaged
by live (powered) sensors.
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Wiring
- It is important to connect the controller in accordance with the wiring data given in this
handbook. Take particular care not to connect AC supplies to the low voltage sensor input or other low
level inputs and outputs. Only use copper conductors for connections (except thermocouple inputs) and
ensure that the wiring of installations comply with all local wiring regulations. For example in the in the
United Kingdom use the latest version of the IEE wiring regulations, (BS7671). In the USA use NEC
Class 1 wiring methods.
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Power Isolation
- The installation must include a power isolating switch or circuit breaker. This device
should be in close proximity to the controller, within easy reach of the operator and marked as the
disconnecting device for the instrument.
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Earth leakage current
- Due to RFI Filtering there is an earth leakage current of less than 0.5mA. This
may affect the design of an installation of multiple controllers protected by Residual Current Device,
(RCD) or Ground Fault Detector, (GFD) type circuit breakers.
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Over current protection
- To protect the internal PCB tracking within the controller against excess
currents, the AC power supply to the controller and power outputs must be wired through a fuse or
circuit breaker specified in the technical specification.
•
Voltage rating
- The maximum continuous voltage applied between any of the following terminals must
not exceed 264VAC:
• line or neutral to any other connection
• relay or triac output to logic, DC or sensor connections
• any connection to ground
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