Rice Lake Load Cells - Wiring for Hazardous Environments - Manual (Page 7)

4 Load Cell Wiring for Hazardous Environments
3. MTL BARRIERS ARE MANUF
ACTURED IN ENGLAND;
REP
. IN USA : MTL INC., 8576 WELLINGTON ROAD, MANASSAS, V
A. 22110.
MORE THAN 250 VOL
TS RMS.
2. ELECTRICAL EQUIPMENT CONNECTED TO BARRIER INPUTS SHOULD NOT USE OR GENERA
TE
1. DRAWING REVISIONS MUST BE APPROVED BY F
ACTOR
Y MUTUAL PRIOR TO RELEASE.
NOTE:
4. R. ST
AHL BARRIERS ARE MANUF
ACTURED A
T
150A NEW BOSTON ST
., WOBURN, MA. 01801.
6. RICE LAKE WEIGHING SYSTEMS MANUF
ACTURES JUNCTION BOXES AND BARRIER BOXES.
JUNCTION BOXES : EL604ST
A, EL604STR, EL604ET
A, EL210, EL211A, AND JB808.
BARRIER BOXES : BBX-XX SERIES.
REP
. IN USA : PEPPERL & FUCHS INC., 1600 ENTERPRISE P
ARKW
A
Y, TWINSBURG, OHIO. 44087.
5. PEPPERL & FUCHS BARRIERS ARE MANUF
ACTURED IN GERMANY
.
IN THE NON-HAZARDOUS AREA. GROUNDING PRACTICES SHOULD CONFORM TO NEC AR
TICLE 250.
7. THE BARRIER MUST BE GROUNDED VIA TWO INDEPENDENT CONNECTIONS TO A GROUND ELECTRODE
THE RESIST
ANCE FROM THE BARRIER TO THE GROUND ELECTRODE MUST NOT EXCEED ONE OHM.
8. MAINS POWERED EQUIPMENT CONNECTED TO THE NON-HAZARDOUS AREA TERMINALS
MUST BE ISOLA
TED FROM THE MAINS SUPPL
Y BY A DOUBLE WOUND TRANSFORMER, UNLESS
THE APPLICABLE ELECTRICAL CODE PERMITS MUL
TIPLE GROUNDING OF THE NEUTRAL LEAD.
9. WIRING CONNECTED TO HAZARDOUS AREA TERMINALS MUST BE SEPERA
TED
FROM NON-INTRINSICALL
Y SAFE WIRING.
CABLE USED ARE NOT KNOWN, V
ALUES OF 60 PICOF
ARAD PER FOOT AND .2 MICROHENERIES PER FOOT MA
Y
FOR THE P
A
R
TICULAR BARRIER MUST NOT BE EXCEEDED. IF THE CAP
ACIT
ANCE AND INDUCT
ANCE OF THE
10. ALL WIRING HAS DISTRIBUTED INDUCT
ANCE AND CAP
ACIT
ANCE. THE MAXIMUM PERMITTED CABLE P
ARAMETERS
BY USED AS CONSER
V
A
TIVE CRITERIA FOR DETERMINA
TION OF CABLE AFFECTS.
SHALL NOT BE RUN IN THE SAME CABLE, UNLESS A
T
LEAST .25 mm THICKNESS INSULA
TION
CABLE. DIFFERENT INTRINSICALL
Y SAFE CIRCUIT OF THE SAME INTRINSICALL
Y SAFE SYSTEM
11. DIFFERENT INTRINSICALL
Y SAFE SYSTEMS SHALL NOT BE RUN IN THE SAME MUL
TICONDUCTOR
IS USED ON EACH CONDUCTOR, OR UNLESS NO HAZARD RESUL
TS FROM INTERCONNECTION.
IF IN DOUBT
, CONT
ACT THE LOCAL INSPECTION AUTHORITY
.
GAS, V
APOR, OR DUST
. REFER TO NFP
A 325 FOR IGNITION LISTINGS.
AT
A TEMPERA
TURE IN EXCESS OF THE IGNITION TEMPERA
TURE OF THE SPECIFIC
12. HAZARDOUS AREA EQUIPMENT SHALL NOT HA
VE EXPOSED ANY SURF
ACE THA
T OPERA
TES
DO NOT INCLUDE THE CAP
ACIT
ANCE AND INDUCT
ANCE OF THE CABLE
WITH OTHER FM ENTITY CER
TIFIED BARRIERS OR INTERF
ACES. THE ENTITY P
ARAMETERS SHOWN
13. THESE LOAD CELLS SHALL BE USED IN CONJUNCTION WITH DEVICES LISTED ON T
ABLE I OR
Vmax. = 27 V
Imax. = 400 mA
Ci = 0.0 micr
ofarads
Li = 0.0 micr
oheneries
THE POLARITY OF THE NON-HAZARDOUS APP
ARA
TUS AND SELECTED BARRIERS.
14. POLARITY OF THE HAZARDOUS AREA TERMINALS ARE DETERMINED BY
SINGLE OR DUAL (AC) OR (DC) BARRIERS WITH THE SAME POLARITY MA
Y BE MIXED
APPLICA
TIONS (AC) MA
Y BE UTILIZED IN DC APPLICA
TIONS IN LIEU OF POLARIZED BARRIERS.
16. ALL BARRIERS MUST BE OF THE SAME POLARITY
. BARRIERS UTILIZED FOR NON-POLAR
IF BARRIER POLARITIES ARE IN COMPLIANCE WITH ITEM "C".
15. LOAD CELL POLARITIES FOR EXCIT
A
TION AND SIGNAL MA
Y BE REVERSED
UNUSED SENSE WIRES OR CONNECT THE SENSING LEADS TO THE EXCIT
A
TION LEAD
18. APPLICA
TIONS NOT REQUIRING EXCIT
A TION SENSING, SHALL EITHER TERMINA
TE AND INSULA
TE
OF THE SAME POLARITY
.
OR SUBSTITUTED. FOR SPECIFIC BARRIER TYPES REFER TO SHEET 2.
17. LOAD CELL MODEL NUMBERS COVERED BY THIS DRAWING:
RL1010 RL1040 RL1250 RL1140 RLETO
RL30000D RLHBB RL1521A RL1260 RL1042
RLHTO RL75058A
SCALE
TREA
TMENT
ANGLE 3 PLC 2 PLC
TOL.
DECIMAL
DRAWING TOLERANCES
TITLE
SHEET OF
DWG NO
THIS DRAWING AND ALL INFORMA
TION CONT
AINED HEREIN IS AND REMAINS
THE PROPER
TY OF RICE LAKE WEIGHING SYSTEMS INC. AND IS CONFIDENTIAL.
IT IS SUBMITTED AND MA
Y BE USED ONL
Y IN CONNECTION WITH RICE LAKE
WEIGHING SYSTEMS' PROPOSAL AND/OR ITS CUSTOMERS' ORDERS. IT SHALL NOT BE DISCLOSED TO OTHERS OR COPIED WITHOUT RICE LAKE WEIGHING SYSTEMS' SPECIFIC WRITTEN CONSENT AND SHALL BE IMMEDIA
TEL
Y RETURNED UPON REQUEST
.
REVISION
REVISIONS
REV
REFERENCE
INIT
DA
TE
ALL THREADS TO BE CLASS 2
UNLESS OTHER
WISE SPECIFIED
ALL DIMENSIONS APPLICABLE AFTER TREA
TMENT
UNLESS OTHER
WISE SPECIFIED
DO NOT SCALE
DRAWING
SURF
ACE
FINISH
MA
TERIAL
THIRD ANGLE PROJECTION
UNITS TO BE INCHES
FOR RL
WS
USE ONL
Y
RICE LAKE WEIGHING SYSTEMS
MFG.ENG.
DR.BY
APPROVED DES.ENG. APPROVED
CKD.
WIRING DIAGRAM,
LOAD CELLS IN HAZARDOUS AREAS
66090
1:1.5
19
--- --- ---
---
--- ---
NEW
PJM 10/5/00 PJM 10/5/00
DFH 10/5/00
0