Siemens 3PCI Series, Operation Manual

Page: 19 / 54

3PCI SCR Power Controller Series Manual Operation
Version 1.2 (19000325)
s
3-3
3.5. Auto/Manual Control with a Controller and Remote Potentiometer
Following the instructions detailed in the previous section (Section 3.4: Remote Manual Control (Only) with a
Potentiometer), select and install the remote potentiometer. Install the AUTO/MAN switch in the same
general location as the remote manual potentiometer.
With the power to the 3PCI turned off, connect the switch, potentiometer, and controller as shown in
Figure 3-3. Note that the full CW position of the potentiometer is the full-power output position.
Place the AUTO/MAN switch to AUTO and calibrate the system as outlined in Section 3.3: Temperature
Controller on page 3-2.
1 (- input) (common)
7 (+ input)
2 (man pot)
4 (common)
8 (+10 VDC)
-
+
Controller
↓
CW
Man
Pot
Auto/Manual
TB1
Figure 3-3. Auto/Manual Control with Controller and Remote Potentiometer
3.6. On/Off Control
Two methods of on/off control are provided:
1. Output enabled by contact closure
2. Output disabled by contact closure.
3.6.1. Output Enabled by Contact Closure
With the power to the 3PCI turned off, connect the system as shown in Figure 3-4. Calibrate the system
as outlined in Section 3.3: Temperature Controller on page 3-2. Note that zero power demand is
accomplished by opening the contacts with the controller, and maximum power demand is present when the
contacts are closed.
8 (+10 Vdc)
2 (+ Input)
TB1
Controller
K
Figure 3-4. On/Off Control with Output Enabled by Contact Closure
3.6.2. Output Disabled by Contact Closure
With the power to the 3PCI turned off, connect the system as shown in Figure 3-5.