Instrutech Hornet User Manual page 25

Instruction Manual
be displayed on the IGM401 screen showing the error. This is intended to prompt the user to determine
what the error condition is before the filament can be turned on again. Once the cause of the error has
been determined and resolved, the error must be cleared before the filament can be turned on again. The
CLR IG ERROR allows the user to clear the IG error using the front panel push buttons, regardless of whether
the IG CNTL mode below is set to Front Panel, Digital Input (DIGI) or RS485.
- OVER PRES 100 [Factory default = 5.00E-02 TORR]
This allows the user to set a pressure value at which the IG filament will automatically turn off
emission current is operating at 100 µA. No value higher than 5.00E-02 Torr, equivalent, can be set.
Note - The user does not have the choice to select a turn off point for the IG filament when the emission
current selected is 4 mA. The IG filament turn off is always set to 1 x 10
setting is 4 mA. When the 4 mA emission current setting is selected the pressure must be at 1 x 10
less before the IG filament can be turned on.
- IG CNTL [Factory default = DIGI/RS485]
This allows the user to choose the source of control for the IG. The IG can be controlled via digital inputs,
RS485 commands or front panel.
 DIGI/RS485
The DIGI/RS485 allows the application of either digital inputs or RS485 communication commands
to operate the IGM401. The default state of the DIGI/RS485 selection is digital input (DIGI). This
control mode requires grounding pin 1 of the 9-pin D-sub male (DE-9P) ANALOG connector to turn
the IG filament to ON and activate the sensor.
The user should verify the DIGI/RS485 is selected in the IG CNTL submenu of the SETUP UNIT menu.
When operating in the Digital Input (DIGI) mode, the IG filament can only be turned on by
continuously connecting circuit ground (pin 2) to pin 1 of the DE-9P ANALOG connector. Degas and
emission current selection can also be set using the digital inputs available on the DE-9P ANALOG
connector. Connect the ANALOG connector pins 2 and 8 together to change from an emission
current of 100 μA to 4 mA. See
Digital I/O connections. Connecting ANALOG connector contact pin 6 to pin 2 will assert DEGAS
when the IG filament is in the ON state. An external control device like a PLC may be used to set pin
1 to ground (circuit common) as long as the PLC circuit common (ground) is tied to the IGM401
ANALOG connector pin 2.
To change from DIGI to RS485 communication mode, use the 9-pin RS485 D-sub female (DE-9S)
connector to connect the DATA A (-) and DATA B (+) RS485 signal lines. The user should verify
DIGI/RS485 is selected in the IG CNTL submenu of the SETUP UNIT menu.
In order for the IGM401 to operate in the in the RS485 mode, the user must send a command to
turn the IG to OFF. If you have already turned the IG ON in the default DIGI mode and you send the
IG OFF command via RS485 to auto switch from DIGI to RS485 mode, the IG will turn OFF. If the
RS485 command to turn IG ON is sent, then the IG will stay in the ON state and the control mode
will be auto switched to RS485.
InstruTech, Inc.
section 3.3.2.1, ANALOG connector pin-out for details related to
IGM401 Hornet
when the
-3
Torr when the emission current
-3
Torr or
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