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VELTRON DPT-
plus
Air Monitor Corporation
116-010-91.P65 (09/18/09)
VELTRON DPT-
plus
- IO&M Manual
12
SECTION 4 – INSTALLATION
4.5 – POWER/SIGNAL CONNECTIONS (con't)
OUTPUT 2
. This output can represent temperature, process, or process D.P., and is provided as either internally
powered/non-isolated or externally powered/isolated. Review the Factory Information Set-Up Sheet (provided separately)
to determine how your unit is configured. Which of the following connection methods to use is determined by how the
unit is configured.
INTERNALLY POWER/NON-ISOLATED (Terminals 2(SIG COM) and 4(OUT-2))
. This 4-20mA output is sourced
(powered) by the VELTRON DPT-
plus
. Maximum load resistance is dependent on the power supply voltage, see
load graph (Figure 4.5).
EXTERNALLY POWERED/ISOLATED (Terminals 4(OUT-2) and 5 (ISO PWR INPUT))
. Power for this 4-20mA
output is via an external (customer provided) 12-32VDC supply. Maximum load resistance is dependent on the
power supply voltage, see load graph (Figure 4.6).
Note:
If it is desired to change from internally powered to externally powered (or vice versa), it is required that jumpers
J1 through J5 be changed in addition to the change in wiring at the terminal strip.
Jumpers J1 through J5 are located on the Analog Board (see Section 9 – Parts List for location).
Figure 4.7 below shows the details of Jumpers J1 through J5. For internally powered, all jumper connectors
must be placed over the two jumper pins labeled DIR. For externally powered, all jumper connectors must be
placed over the two jumper pins labeled ISO.
These jumpers affect both Output 1 and Output 2, such that both are set the same (i.e. both internally powered
or both externally powered).
Figure 4.7
Figure 4.7 depicts jumpers set for internally powered.