14108242 Installation, operation and maintenance manual – Squirrel cage motor – WGM20 Line l 23
4.5.5
Temperature and ohmic resistance of the PT100 thermoresistance
Table 4.6 shows the temperature as a function of the ohmic resistance measured across PT100 RTDs.
Table 4.6: Temperature X Resistance (Pt100)
º C
0
1
2
3
4
5
6
7
8
9
0
100.00
100.39
100.78
101.17
101.56
101.95
102.34
102.73
103.12
103.51
10
103.90
104.29
104.68
105.07
105.46
105.95
106.24
106.63
107.02
107.40
20
107.79
108.18
108.57
108.96
109.35
109.73
110.12
110.51
110.90
111.28
30
111.67
112.06
112.45
112.83
113.22
113.61
113.99
114.38
114.77
115.15
40
115.54
115.93
116.31
116.70
117.08
117.47
117.85
118.24
118.62
119.01
50
119.40
119.78
120.16
120.55
120.93
121.32
121.70
122.09
122.47
122.86
60
123.24
123.62
124.01
124.39
124.77
125.16
125.54
125.92
126.31
126.69
70
127.07
127.45
127.84
128.22
128.60
128.98
129.37
129.75
130.13
130.51
80
130.89
131.27
131.66
132.04
132.42
132.80
133.18
133.56
133.94
134.32
90
134.70
135.08
135.46
135.84
136.22
136.60
136.98
137.36
137.74
138.12
100
138.50
138.88
139.26
139.64
140.02
140.39
140.77
141.15
141.53
141.91
110
142.29
142.66
143.04
143.42
143.80
144.17
144.55
144.93
145.31
145.68
120
146.06
146.44
146.81
147.19
147.57
147.94
148.32
148.70
149.07
149.45
130
149.82
150.20
150.57
150.95
151.33
151.70
152.08
152.45
152.83
153.20
140
153.58
153.95
154.32
154.70
155.07
155.45
155.82
156.19
156.57
156.94
150
157.31
157.69
158.06
158.43
158.81
159.18
159.55
159.93
160.30
160.67
4.5.6
Space heater
The motor is equipped with a space heater to prevent
internal water condensation during long periods out of
operation, it must be assured that the space heater is
energized shortly after turning the motor off, and that it is
de-energized before the motor is put into operation.
The values of the space heater supply voltage and power
are informed in the connection diagram and in the specific
plate affixed to the motor.
4.5.7
Water leak sensor
The motor is supplied with a water leak optical sensor,
installed internally, which uses the detection system by
diffraction.
The optical sensor is connected to the activation relay
installed inside of the accessories terminal box and serves
to detect any water leaks from the cooling system into the
motor.
The details of this accessory are shown in CONNECTION
DIAGRAM supplied with the motor.
NOTE
The water leak sensor is installed in the
lowest part of the motor.
4.5.8
Water temperature sensor
The temperature sensors installed at the water inlet and
outlet (if any) are used to monitor the water temperature.
The water inlet temperature is indicated in item 4.6.1.3
and on a specific plate of the cooling system fixed to the
motor frame.
Formula:
Ω
- 100 =
°
C
0.386
