Woodward highprotec MRI4, User Manual

Page: 28 / 727

Installation and Connection
The housing must be carefully grounded. Connect a ground cable (protective
earth, 4 to 6 mm
2
[AWG 11‒9], tightening torque 1.7 Nm [15 lb⋅in]) to the
housing, using the screw that is marked with the ground symbol (at the rear
side of the device).
Moreover, the power supply card needs a separate ground connection
(functional earth, min. 2.5 mm
2
[≤ AWG 13], tightening torque 0,56 ‒ 0,79 Nm
[5‒7 lb⋅in]). See the “Terminal Marking” diagram in Section “DI-4 X – Power
Supply and Digital Inputs” to check for the correct terminal.
All grounding connections (i. e. protective and functional earth) must be low-
inductance, i. e. as short as possible, and national standards – if applicable –
must be followed.
28 MRI4 DOK-HB-MRI4-2E