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Page 10
Pre-installation Settings
Mode of Operation
The Terranova® 752A has three different modes of operation available: Mode 0, Mode 1, and
Mode 2. The selected mode of operation applies to both channels. In all three modes, high
voltage operation may be manually controlled via the
HIGH VOLTAGE ON/OFF
button or through
serial communication.
Mode 0: Standard Operation
High voltage operation and parameter input is conducted via the front panel or through serial
communication. High voltage output is dependent on the safety interlock circuit (see
on page 20) of the channel. High voltage operation will be interrupted if the
respective safety interlock circuit is open or a ground fault is detected. Default mode of operation.
Mode 1: Secondary Interlock
High voltage operation and parameter input is conducted via the front panel or through serial
communication. However, high voltage output is dependent on a secondary interlock in addition
to the safety interlock circuit (see
on page 20) of the channel. The secondary
interlock is based on the voltage level of a +5 V TTL circuit. A user-installed switch can also be used
to operate the secondary interlock.
To commence and maintain high voltage output, the respective safety interlock circuit must
remain closed and a LOW-level TTL signal must be continuously applied (or the installed switch
must remain closed). High voltage operation will be interrupted if the respective safety interlock
circuit is open, a ground fault is detected, or when a HIGH-level TTL signal is applied (or the
installed switch is opened) to the respective channel. The TTL signal is input (or switch is installed)
between PIN 8 / PIN 3 of the MISCELLANEOUS port (PIN 13 / PIN 15 on the AUXILIARY port) for
CHANNEL 1 and PIN 10 / PIN 15 of the AUXILIARY port for CHANNEL 2. See
and
on page 7 for pin configuration.
If user attempts to start high voltage operation with
the second interlock circuit open, error code ER6
will be output onto the respective CURRENT display.
NOTE
Since 1976
