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ControlMaster CM30, CM50 and CMF310
Universal process controllers,
1
/
4
,
1
/
2
DIN and fieldmount
4 Installation
IM/CM/ED–EN Rev. X
15
4.6 Electrical Connections
Warning.
The controller is not fitted with a switch therefore a disconnecting device such as a switch or
circuit breaker conforming to local safety standards must be fitted to the final installation.
The switch must be mounted in close proximity to the controller within easy reach of the operator
and must be marked clearly as the disconnection device for the controller.
Remove all power from supply, relay and any powered control circuits and high common mode
voltages before accessing or making any connections.
Use cable appropriate for the load currents. The CM30 and CM50 terminals accept cables from
18 to 14 AWG (0.8 to 2.5mm
2
). The CMF160 terminals accept cables from 26 to 14 AWG (0.14
to 2.5mm
2
)
Always route signal leads and power cables separately, preferably in earthed (grounded) metal
conduit.
It is strongly recommended that screened cable is used for signal inputs and relay connections.
For I/P lead lengths > 30 m (98 ft.) screened cables must be used.
Instruments conform to Mains Power Input Overvoltage Category 2, Pollution Degree 2
(EN601010–1). (The CM30 and CM50 are protected through double insulation –
Insulation Class II.) CMF310 Insulation Class 1.
Analog / digital inputs and outputs, transmitter power supply and DC power supply are SELV
(Safety Extra Low Voltage) circuits.
All connections to secondary circuits must have basic insulation.
After installation, there must be no access to live parts, for example terminals.
Terminals for external circuits are for use with equipment with no accessible live parts only.
If the controller is used in a manner not specified by the Company, the protection provided by the
equipment may be impaired.
All equipment connected to the controller's terminals must comply with local safety standards
(IEC 60950, EN601010–1).
CM30, CM50, CMF310 Controllers – USA and Canada Only
The supplied cable glands are provided for the connection of signal input and ethernet
communication wiring ONLY.
The supplied cable glands and use of cable / flexible cord for connection of the mains power
source to the mains input and relay contact output terminals is not permitted in the USA or
Canada.
For connection to mains (the mains input and relay contact outputs), use only suitably rated field
wiring insulated copper conductors rated min. 300 V, 14 AWG, 90C. Route wires through suitably
rated flexible conduits and fittings.
Warning.
Note.
The CM30 and CM50 terminal screws must be tightened to a torque of 0.1 Nm (0.9 lbf/in.).
The CMF310 terminal screws must be tightened to a torque of 0.5 to 0.6 Nm (4.42 to 5.31 lbf/in.).