TRACE
MATE
Chapter 5
TESTING
5.2
Table 5.2 Resistance versus Temperature in °C
(DIN 43760 RTD)
°C
R (ohms)
°C
R (ohms)
°C
R (ohms)
-40
84.27
80
130.89
200
175.84
-30
88.22
90
134.70
210
179.51
-20
92.16
100
138.50
220
183.17
-10
96.09
110
142.29
230
186.82
0
100.00
120
146.06
240
190.46
10
103.90
130
149.82
250
194.08
20
107.79
140
153.58
260
197.69
30
111.67
150
157.32
270
201.30
40
115.64
160
161.04
280
204.88
50
119.39
170
164.76
290
208.46
60
123.24
180
168.47
300
212.03
70
127.07
190
172.16
Ground Fault Testing
It is possible to simulate a ground fault by creating a
situation where the current from the two heater terminals
1 and 2 is not equal. As shown in figure 5.2, this is done
by connecting a resistor across terminals 1 and 4.
Follow these steps to test the ground fault circuit:
1. Turn on incoming power. Set the gound fault trip
alarm setpoint to 30mA ( default ).
2. Turn off incoming power.
3. Connect a resistor between terminals 1 and 4.
This allows ground fault current I
G
to flow,
which will be seen by the ground fault sensor as
a ground fault. Size the resistor according to the
Heater Voltage
110
240
208 AC Volts
Resistance
2700
6200
5100
Ohms
Wattage
5
10
10
Watts
Voltage Rating
250
500
500 DC Volts
table to ensure sufficient ground fault current of
30mA ± 25%.
4. Apply power. The ground fault indicator should
come on after a short delay. It should not be
possible to turn on the heater even if the actual
temperature is below the setpoint. The
TraceMate acts a ground fault circuit breaker.
5. Turn off incoming power.
6. Remove the ground fault resistor between
terminals 1 and 4.
7. Re-apply power. All alarm indicators should be
off.
Repairs
In the event of a hardware failure, system operation can
be restored quickly by following this procedure:
1. Turn off incoming heater and alarm power.
2. Ensure that all wires are correctly marked for the
corresponding terminals.
3. Disconnect all wires to the terminals.
4. Remove any screws holding the TraceMate
controller and return it to the factory for repair.
5. Install a replacement TraceMate controller.
6. Reconnect the wires, apply power and follow
the testing procedure for a new control.
Figure 5.2 Ground Fault Simulation
