Rice Lake 320IS Plus Intrinsically Safe Digital Weight Indicator - Installation Manual - Manual (Page 18)

12 320IS Plus Installation Manual
Before connecting the AC power to the power supply:
1. Determine the length of AC power cord necessary to reach from the AC power panel to the power supply
where it is mounted.
2. Cut the AC power cord to that length. If you are mounting the I.S. power supply in a hazardous area, all
AC power must be routed through approved conduit, where necessary make allowances in length of the
conduit.
3. Install the AC power cord but do not hook up to the AC power.
Do not, under any circumstances, connect or disconnect the DC wire from the indicator while the AC
power is applied to the power supply. This will cause the power supply fuse to blow.
4. Determine the length of the DC power cord necessary to reach from the AC power supply to the 320IS
Plus indicator and add 7" to that length.
5. Cut the DC power cord to that length.
2.4.1 Braided Power Cable Connection with Ferrite Core
Use the following procedure for connecting braided power cable with the ferrite core:
1. If using the ferrite core, carefully remove 7" of the outer blue insulation and 6.5" of braid from the cable.
If not using the ferrite core, go to Section 2.4.2.
2. Remove the reducing gland and metal sleeve from the center cord grip of the indicator. Place them on a
work surface.
3. Remove the cap and reducing gland from the 320IS Plus parts kit.
The cap and reducing gland from the parts kit have larger holes. DO NOT confuse these parts with the
parts removed from the cord grip of the indicator.
4. Take the metal sleeve (from step 2) and insert it into the reducing gland taken from the parts kit.
5. Place the domed cap and reducing gland that were removed from the 320IS cord grip, into the parts kit
(to be used as spares).
6. Thread the DC cable through the domed cap, then through the reducing gland/metal sleeve combination.
7. Lower the reducing gland assembly so that the end of the metal sleeve is at the edge of the insulation and
fold the braid over the metal sleeve (Figure 2-2). Trim the braid if necessary.
8. Trim the white wire back to match the end of the braid.
9. Tin the green and brown wire ends.
10. Thread the cable through the cord grip stem.
Chassis ground is made through the braid compressed between the metal sleeve and the cord grip stem.
11. Lower the domed cap onto the cord grip stem and tighten until a small swelling of the rubber of the
reducing gland appears between the domed cap and cable (see Figure 2-3).
Figure 2-3. Proper Cord Grip Compression
WARNING
Note