INFICON T3000 Thermal Power Supply - Manual (Page 26)

instruments Thermal Power Supply T3000
Section 3 Page 3 - 5 Operating Instructions
Table 3.2-1 shows the function of each pin for connector J1 where control and monitor
signals interface with the unit.
Table 3.2-1 T3000 Connector J1 Pin Assignments
PIN NUMBER PIN FUNCTION
1 Open Boat Output High
2 +5 VDC Out
3 Signal Ground
4 Output Voltage Monitor 1VDC = 1.5VRMS
5 External Reset
6 No Connection
7 Current Set Point Control Voltage
8 No Connection
9 Over Temperature Output High
10 +5 VDC
11 Signal Ground
12 + 12 VDC Out
13 Output Load Power On When Low
14 Series / Parallel Select
15 Current Monitor 1VDC =100ARMS Parallel; 50ARMS
Series
Figure 3.2-1 shows the rudiments for controlling the T3000 output current via connections to J1.
Table 3.2-1 shows other signals that are useful in the stand-alone configuration if it is desired to
monitor output levels. For example, the DC voltage between pin 15 and ground (pins 3 and 11) is
proportional to output RMS current in the load. For the parallel output connection the scale factor is
1 VDC equals 100 ARMS, and for the series-connected output, 1VDC equals 50 ARMS in the load.
Similarly, the output voltage can be monitored at pin 4 where the scale factor is set to 1 VDC equals
1.5 VRMS across the output terminals. For example, to set the output current to 300 ARMS for a
parallel load connection, the ON/OFF switch is set to the shorted position and the control voltage
input on pin 7 is slowly adjusted until the pin 15 voltage is equal to 3 VDC, which corresponds to an
output current of 300 ARMS into the load.
Operation of the T3000 with the RS3000 controller is covered in Section 4 of this manual. Use with
a rate deposition controller, such as the STC200 or STC2000, is covered in manuals for those
products. Note that the auxiliary monitor signals are available on connector J1 when used with a
rate controller, but a custom cable would be required to split off the desired signals (see Figure 3.2-
1). For applications requiring rate control, it is recommended that an RS3000 be used in conjunction
with the rate deposition controller as it provides monitoring of set points, output power, temperature
and open load faults, and provides a compatible interface to the T3000.