IM-P323-32
CTLS Issue 5
7
SX80 and SX90 Quickstart Guide
Voltage rating
The maximum continuous voltage applied between any of the
following terminals must not exceed 240 Vac:
-
Relay output to logic, dc or sensor connections.
-
Any connection to ground.
Warning: The controller must not be wired to a three phase supply
with an unearthed star connection. Under fault conditions such a
supply could rise above 240 Vac with respect to ground and the
product would not be safe.
Conductive pollution
Electrically conductive pollution i.e. carbon dust, MUST be excluded
from the enclosure in which the controller is installed. To secure a
suitable atmosphere in conditions of conductive pollution, fit an air
filter to the air intake of the enclosure. Where condensation is likely,
include a thermostatically controlled heater in the enclosure.
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 is ground.
Do not rely on grounding through the framework of the machine.
Overtemperature protection
To prevent overheating of the process under fault conditions, a
separate overtemperature protection unit should be fitted which
will isolate the heating circuit. This must have an independent
temperature sensor.
Note: Alarm relays within the unit will not give protection under all
failure conditions.
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