ABB DDO01 Freelance 2000 programmable analog input and output unit
For trouble free operation, the earthing must be carried out carefully. Note the following:
• If the free (unscreened) length exceeds 0.1 m (4 in.) the individual pairs of power
and signal conductors must be twisted separately
• The external protective earth (PE) cable must be attached to one of the earthbar screw
clamps.
• All the cable screens have to be connected to the earth bar and the length of the screen
connection must be less than 50 mm (2 in.).
NOTE
The cable screens must be earthed at one end only.
• Since the signal earth of the measurement system is connected to the chassis earth of the
tension electronics, the input of a superior system connected to the control system must not
be earthed. The best ways of interconnecting the measurement system and a superior
system to achieve optimal function are shown in Figure 2-7 and Figure 2-8.
Mounting Cabinets Together
If cabinets are to be mounted to each other use the included screw/bolt kit. The four M8 screws,
with washers and nuts, in the angle hinges and six M6 screws at about Z1=500, Z2=1000,
Z3=1500 mm height from the floor, see Figure 2-9. Tighten the M8 screws to 20 Nm maximum
and the M6 screws to 10 Nm maximum.
Figure 2-9. Mounting Cabinets together - Screw Position
2.5.2 Mounting Cabinets to the Floor
When fixing the cabinet to the floor use four or six M12 screws where Figure 2-10 indicates,
one at each corner in the first left hand cabinet in a row of cabinets and screw the following
cabinets with two screws each at the right hand side. The bottom angle hinges features holes,
14 mm (0.6”) in diameter. These holes permit you to adjust the cabinet location after holes are
drilled in the floor. If drilling is necessary, make sure that no dust or other foreign matter enters
the equipment in the cabinet. Please notice the minimum distances from cabinet to walls and
ceiling. Use washers between the floor and the cabinet bottom to level the cabinet floor into a
horizontal position.

The overall dimensions of the cabinet are shown in a dimension diagram in
Appendix A.6 Drawings.
The following rules apply to locating and positioning of the cabinet:
• The distance between the top surface of the cabinet and the roof, soffit of a beam or
ventilation duct etc. must be at least 250 mm. If cables enter from above, this distance is
increased to 1000 mm.
• There must be a clearance of at least 40 mm between the rear of the cabinet and the wall,
and between the sides of the cabinet and the wall.
• To permit a frame with hinge, or a door to an outer encapsulation to open fully without
catching on the adjacent wall, the distance to the wall must be increased to 500 mm on the
hinge side (left) of the frame, or 300 mm on the hinge side (right) of the door.
• There must be at least 1 meter of free space in front of the cabinet. It must be possible to
open the door completely, in order not to restrict access for check-out and servicing
PFXC 141 are normally used for connection of Pressductor® load cells where the distance
between load cells and tension electronics is long. The cables fixed to the load cells and the
cable to the control unit are to be connected to the junction box.
The junction box PFXC 141 shall be mounted adjacent to the load cells and located in a
protected position easily accessible for service.
The dimensions of the junction box are shown in Figure 2-11.
Holes not used must be plugged.
For circuit diagram see Appendix A.5.3 Junction Box PFXC 141.