Emerson OCX 8800 Instruction Manual page 38

OCX 8800
3-2
Verify Configuration
There are three switches on the microprocessor board which are user
configurable for the OCX 8800 (Figure 3-1). SW1 determines if the O
mA signal is internally or externally powered. SW2 determines if the COe 4-20
mA signal is internally or externally powered. SW3 sets the rail limits for the
O and COe 4-20 mA signals and configures the sample line heater control
2
circuit. All switches are accessible through holes in the electronics box.
Remove power from the OCX 8800 before changing defaults. If defaults are changed under
power, damage to the electronics may occur.
Verify that the following switch settings are correct for your OCX 8800
installation:
SW1 The two settings are internally or externally powering the O
mA signal. The factory setting is for the O
powered.
SW2 The two settings are internally or externally powering the COe 4-20
mA signal. The factory setting is for the COe 4-20 mA signal to be
internally powered.
SW3 The factory sets this switch as follows:
• Position 1 determines the O
high, 21.1 mA, or low, 3.5 mA. The factory setting is low, 3.5 mA.
• Position 2 determines the COe 4-20 mA signal rail limit. The settings
are high, 21.1 mA, or low, 3.5 mA. The factory setting is high, 21.1 mA.
• Positions 3 and 4 must be set as shown for proper software control of
the device heaters.
Instruction Manual
IM-106-880, Rev 1.0
4-20 mA signal to be internally
2
4-20 mA signal rail limit. The settings are
2
January 2007
4-20
2
4-20
2