Installation/Assembly; Installation; Connection - Siemens SIWAREX JB Instruction Manual

2 Installation/Assembly

2.1 Installation

The SIWAREX JB junction box may only be installed and connected by qualified
personnel.

2.2 Connection

The connection of load cells with 4 or 6-wire technique to a weigh module must be
made according to the wiring diagrams in fig. 2-1 or fig. 2-2, page 8. Analogously,
several load cells are also connected in parallel.
The pinout of the terminals is shown in fig. 2-3, page 9. Four terminals are
connected in signal blocks with a plug-in bridge.
The cable shields in the EMC screw cable glands should cover a large area
(fig. 2-4, page 9). EMC cable glands and sealing plugs are delivered with the
junction box. They should be mounted according to the number of load cells.
Unused openings in the housing should be sealed with sealing plugs.
The pinout of the screw cable glands is shown in fig. 2-5, page 10.
When connecting load cells using 4 wires, two bridges are absolutely necessary:
IMPORTANT
If the two bridges EXC-/SENSE- and EXC+/SENSE+ are missing in load cells in
4-wire technology, this can be signaled by the weigh module as a wire break.
SIWAREX JB junction box in aluminum housing – Instruction Manual
A5E00400544B
Bridge 1: EXC- to SENSE-
Bridge 2: EXC+ to SENSE+
7