Bration, Field calibration, Calibration – Watlow Electric Ramping and Profiling Microprocessor-Based Control SERIES 1500 User Manual
Page 78
bration
Technical Reference
78
WATLOW Series 1500 User's Manual
Field Calibration, Appendix
Calibration
1.
Document DIP Switch settings and values in Guarded Access, pages 54 & 56.
2.
Set Series 1500 DIP Switches 3 & 6 ON, all others OFF.
3.
Set mV Source as follows.
Type
Setting
J
-0.885 mV, (0
°
F)
K
-0.692 mV, (0
°
F)
R
+2.282 mV, (550
°
F)
4.
Connect DVM, (-) minus to Signal Conditioner connector terminal 1 and (+) plus
to test point TP-10 on the Signal Conditioner Board.
5.
Power up Series 1500 Control. Will power up in deg. F. Press "CLEAR" to stop
flashing. Allow atleast 15 minutes for the control to stabilize.
6.
With mV Source set as follows, adjust "SPAN POT" for 5.000VDC on DVM.
Type
Setting
J
-0.885 mV, (0
°
F)
K
-0.692 mV, (0
°
F)
R
+2.282 mV, (550
°
F)
7.
Connect DVM, (+) plus to TP100 (TP99 for CH-2) and adjust "Zero Adjust Pot"
for the following DVM reading at TP-100 (TP99 for CH-2). Then verify that Actual
reads as follows.
Type
DVM Reading
Actual Reading
J
0.0VDC
±
0.003
0
°
F
±
3
K
0.0VDC
±
0.003
0
°
F
±
3
R
0.8594VDC
±
0.003
550
°
F
±
3
8.
Set mV Source as follows, and adjust "F.S. POT" for the corresponding DVM
reading. Actual should read the value shown.
Type
mV Source
DVM Reading
Actual Reading
J
39.40mV, (1300
°
F)
2.031VDC
±
0.003
1300
°
F
±
3
K
52.93mV, (2400
°
F)
3.750VDC
±
0.003
2400
°
F
±
3
R
20.28mV, (3100
°
F)
4.884VDC
±
0.003
3100
°
F
±
3
9.
Set mV Source as follows. DVM and Actual readings should be as shown.
Type
mV Source
DVM Reading
Actual Reading
J
17.19mV, (600
°
F)
0.9375VDC
±
0.005
600
°
F
±
5
K
26.97mV, (1200
°
F)
1.875VDC
±
0.009
1200
°
F
±
6
R
10.27mV, (1800
°
F)
2.812VDC
±
0.005
1800
°
F
±
5
The following
procedure applies
to all three T/C
types, although
the Input/Output
values may differ
between types.
Use the values
corresponding to
NOTE:
Field Calibration