Troubleshooting, Mhgrvii controller technical guide 11 – Orion System MHGRV II User Manual
Page 11
MHGRVII Controller
Technical Guide
11
Temperature to Resistance/Voltage Chart
Temp
(
°F)
Temp
(
°C)
Resistance (Ohms)
Voltage @
Input (VDC)
-10
-23.3
93333
4.620
-5
-20.6
80531
4.550
0
-17.8
69822
4.474
5
-15.0
60552
4.390
10
-12.2
52500
4.297
15
-9.4
45902
4.200
20
-6.7
40147
4.095
25
-3.9
35165
3.982
30
-1.1
30805
3.862
35
1.6
27140
3.737
40
4.4
23874
3.605
45
7.2
21094
3.470
50
10.0
18655
3.330
52
11.1
17799
3.275
54
12.2
16956
3.217
56
13.3
16164
3.160
58
14.4
15385
3.100
60
15.6
14681
3.042
62
16.7
14014
2.985
64
17.8
13382
2.927
66
18.9
12758
2.867
68
20.0
12191
2.810
69
20.6
11906
2.780
70
21.1
11652
2.752
71
21.7
11379
2.722
72
22.2
11136
2.695
73
22.7
10878
2.665
74
23.3
10625
2.635
75
23.9
10398
2.607
76
24.4
10158
2.577
78
25.6
9711
2.520
80
27.8
9302
2.465
82
27.8
8893
2.407
84
28.9
8514
2.352
86
30.0
8153
2.297
88
31.1
7805
2.242
90
32.2
7472
2.187
95
35.0
6716
2.055
Troubleshooting
Temperature to Resistance/Voltage Chart
Temp
(
°F)
Temp
(
°C)
Resistance (Ohms)
Voltage @
Input (VDC)
100
37.8
6047
1.927
105
40.6
5453
1.805
110
43.3
4923
1.687
115
46.1
4449
1.575
120
48.9
4030
1.469
125
51.7
3656
1.369
130
54.4
3317
1.274
135
57.2
3015
1.185
140
60.0
2743
1.101
145
62.8
2502
1.024
150
65.6
2288
0.952
Table 2, cont.: Temperature Sensor - Voltage &
Resistance for Type III Sensors
Thermistor Sensor Testing Instructions
1.) Use the resistance column to check the thermistor sensor while
disconnected from the controllers (not powered).
2.) Use the voltage column to check sensors while connected to pow-
ered controllers. Read voltage with meter set on DC volts. Place the “-”
(minus) lead on GND terminal and the “+” (plus) lead on the sensor
input terminal being investigated.
If the voltage is above 5.08 VDC, the sensor or wiring is “open.” If the
voltage is less than 0.05 VDC, the sensor or wiring is shorted.
Table 2: Temperature Sensor - Voltage &
Resistance for Type III Sensors