TELEPHONE:
650-969-8811
TOLL-FREE (US/Canada):
800-446-8811
FAX:
650-965-0764
EMAIL:
WEB:
16
of
38
If a channel enters the Cool-down Mode, a BEEP will be emitted followed by the code CD1 to
indicate the first of five OFF/ON states. During these cycles, high voltage operation is
automatically disabled for five minutes (i.e. OFF period) and enabled for 10 minutes (i.e. ON
period). If the ion pump current is not reduced during the ON period, the unit will commence
the next OFF/ON cycle. The control unit will emit X number of BEEPs
–
if the speaker is not
disabled
–
and output the code CDX onto the corresponding CURRENT display, where X is the
cycle number, to indicate the start of the corresponding OFF/ON cycle. If current is significantly
reduced at any time during an ON period, the channel will exit the Cool-down Mode and
resume normal operation. However, if current is not reduced by the end of the OFF period of
the fifth cycle, the channel will automatically enter the Shutdown Mode and output the code
SD5 onto the respective CURRENT display.
Shutdown Mode
A channel will enter the Shutdown Mode if current output is not successfully reduced during
the cool-down cycles. The channel will also enter the Shutdown Mode if high voltage output is
shorted to ground or power output remains relatively high. This can occur either through a
malfunction of the ion pump or ion pump cable. When a channel enters a shutdown state, high
voltage operation is disabled, a five-second BEEP is emitted
–
if the speaker has not been
disabled
–
and the code SD will be output onto the respective CURRENT display. To recover
from a shutdown, high voltage operation may only be restarted via the respective
HIGH VOLTAGE ON/OFF
button.
User cannot recuperate from a shutdown state via remote operation
Set Point Operation
The Terranova® 752A can be utilized for process control functions through the use of two
independent, programmable set points and corresponding relays
–
i.e. CHANNEL 1 SET POINT
and CHANNEL 2 SET POINT. Set point pressure values may be adjusted either through the front
panel or serial communication; relay output is accessible through both the MISCELLANEOUS I/O
or AUXILIARY I/O ports for CHANNEL 1 and AUXILIARY I/O port for CHANNEL 2. See
Table 5
and
Table 6
for relay pin configuration.
The relay will activate once the pressure reading is less than or equal to the SET POINT value for
each respective channel. The SET POINT LED for the respective channel will become illuminated
once the relay is active. The relay will deactivate once the pressure reading is greater than or
equal to 20% of the respective SET POINT value. The relay deactivation pressure value can be
determined by the following
S
+ 0.2*
S
