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C. Turn the "output adjust" knob completely counterclockwise
D. Energize the converter as outlined in
Section 3.3.1
.
E. Switch the "control on-off" to the "on" position
F. Adjust the "output adjust" knob to the desired current level. The converter will hold the desired
current level constant for varying load conditions.
NOTE
: The converter will hold the desired current level for an operating range
from 10% to 100% of the converter's full rated output voltage.
3.3.5 Conversion to Current Mode of Control
The conversion from voltage mode to current mode of control is easily accomplished.
1. Open front panel of converter (see
Section 2.1
) and locate the upper terminal strip mounted on
the control panel
2. Locate Terminals No. 21 and No. 20 on the terminal strip. See
Figure 17
.
3. Remove wire No. 21 from Terminal No.21 and wire No.20 from terminal No.20.
4. Connect wire No. 21 to Terminal No. 20 and wire No. 20 to Terminal No. 21. See
Figure 18
.
5. Reverse steps 3 and 4 for conversion back to voltage mode of control.
3.3.6 Turn-Off Procedure
The MACC may be shut off by two methods:
1. For operation without interrupting the starter or contactor, switch the "control on-off" switch to
the "off" position. This stops the firing pulses to the line SCR’s and shuts off the converter. This
switch allows complete control of the converter from the control panel without having to de-
energize the starter or contactor.
2. Depress the "stop" button. This will interrupt the magnetic coil of the starter, or contactor, and
remove the converter from the line.
Figure 17
Wiring Connection for Current
Mode of Operation
Figure 18
Wiring Connection for Voltage
Mode of Operation
Summary of Contents for MACC
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