Woodward MRM4, Manual

Page: 26 / 460

Installation and Connection
Installation Diagram 7-Pushbutton Version
Even when the auxiliary voltage is switched-off, unsafe voltages might
remain at the device connections.
The installation diagram shown in this section is exclusively valid for
devices with 7 pushbuttons at the front side of the HMI.
(INFO-, C-, OK-Pushbutton and 4 Softkeys (Pushbuttons)).
B1 Housing Door Cut-out (7-Pushbutton Version)
The housing must be carefully earthed. Connect a ground cable (4 to 6 mm
2
/ AWG 12-10) / 1,7 Nm [15 In-lb]) to the housing, using the screw, which is
marked with the ground symbol (at the rear side of the device).
The power supply card needs a separate ground connection (2.5 mm
2
(AWG 14) at terminal X1 (0.56-0.79 Nm [5-7 In-lb]).
Be careful. Do not over-tighten the mountings nuts of the relay
(M4 metric 4 mm). Check the torque by means of a torque wrench (1,7 Nm
[15 In-lb]). Over-tightening the mounting nuts could due to personal injury
or damage the relay.
Page 26 EN MRM4 01/11