Owner manual

90 Rev. 5
Operation
External Rampdown : External Rampdown while not in Persistent Mode
Note
The external rampdown signal MUST be cleared before pressing
ENTER will yield a response. Further operator control is inhibited
until the external rampdown signal is cleared.
6. Once the external signal has been cleared,
ENTER can be pressed.
User control will be re-established and the operator can continue
manual operation of the system. The following will be displayed
after pressing
ENTER:
3.16.2 External Rampdown while not in Persistent Mode
When external rampdown is initiated with the magnet not in
PERSISTENT mode, the persistent switch is either off or not installed so
there is no need for persistent switch heating. The power supply is already
at (and in control of) the magnet current, so the Model 430 Programmer
executes an ordinary rampdown:
1. The rampdown begins immediately at the ZEROING CURRENT
mode described on page 89 (step 4 of section 3.16.1, “External
Rampdown while in Persistent Mode”):
2. The sequence continues as described for the magnet in persistent
mode (section 3.16.1, steps 5 through 6).
Note
After rampdown, the external rampdown signal MUST be cleared
before continuing. Further operator control is inhibited until the
external rampdown signal is cleared.
3.17 Summary of Operational Limits and Default Settings
Table 3-7 provides a summary of the operational limits and the default
setting for all Model 430 Programmer parameters. If the user attempts to
enter a value outside of the limits, the Model 430 Programmer will beep
once and revert to the previous setting.
+0.00 A - Mode: Zero Current
+0.00 Vs PSwitch Heater: ON
+48.85 A  Mode: Zeroing Current
+1.89 Vs PSwitch Heater: ON