voltage/current spikes introduced in the magnet system with could
produce undesirable results.
k. Reconnect the power leads to the vapor cooled current leads.
2.
Mode A
(normal mode) operation:
a. Place the Computer-Manual switch in the MANUAL position.
b. Place to Up-Pause-Down switch in the DOWN position.
c. Adjust the Voltage Limit to 10, Ramp Rate and Current Limit as desired.
d. Use the charging voltage and inductance in the specification sheet to calculate the rate
from the equation V = L dI/dt.
e. Energize the programmer and the power supply.
CAUTION:
Always energize the programmer first, then the
power supply upon system startup and always deenergize the
programmer last on system shutdown to allow the programmer to
always have control of the system. Not doing so could result in
voltage/current spikes introduced in the magnet system with could
produce undesirable results.
f. Enable the quench detection circuit (if desired).
g. Ramp the magnet up or down by using the Up-Pause-Down switch.
h. The various switches (Ramp Rate Range, Ramp Rate, Current Limit, and
Up/Down/Pause ) can be changed at any time. Care should be exercised not to set the
current limit or ramp rate to higher values than can be tolerated by the magnet.
i. To change the current setting (and field) place the ramp up-down switch in the
PAUSE position. Set the rate range switch and rate dial to the charge rate desired and
the current limit to the desired point. Placing the ramp switch to the UP position will
cause the current to ramp up at the desired rate. The current can be stopped, and held
at any time by placing the ramp switch to PAUSE, or can be ramped down at the
chosen rate by flipping the switch to the DOWN position. The desired rate is
maintained provided the charge and discharge voltages demanded by the
superconducting coil (V = L dI/dt) are within the capabilities of the power supply -
diode system. If the ramp switch is left in the UP position the current will ramp up to
the current limit where it will be locked in to a stable current mode.
3.
Mode B
(computer mode) operation:
a. Connect a cable from your computer interface to the Computer Control connector on
the back of the programmer. The pin connections to the programmer are shown in
Figure 6.
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