Vertu Series VPM3000 Process Meters & Temperature Transmitters
Instruction Manual
12
Figure 11. Connector Labeling for VPM3112
Figure 12. Connector Labeling for VPM3220
Figure 13. Connector Labeling for VPM3121
Power Connections
Power connections are made to a two-terminal
connector labeled POWER on Figures 4-21. See
. The meter will
operate regardless of DC polarity connection. The +
and - symbols are only a suggested wiring convention.
Figure 14. Power Connections
Signal Connections
Signal connections are made to a five-terminal
connector labeled SIGNAL shown in Figures 4-21.
See page
. The COM
(common) terminal is the return for all types of input
signals.
Current and Voltage Connections
The following figures show examples for current and
voltage connections.
There are no switches or jumpers to set up for current
and voltage inputs. Setup and programming is
performed through the front panel buttons.
Figure 15. Transmitter Powered by Internal Supply
(Optional)
Figure 16. Transmitter Powered by External Supply
or Self-Powered
The current input is protected against current
overload by a resettable fuse. The display may or
may not show a fault condition depending on the
nature of the overload.
The fuse limits the current to a safe level when it
detects a fault condition, and automatically resets
itself when the fault condition is removed.
Figure 17. Voltage Input Connections
The meter is capable of accepting any voltage from
-10 VDC to +10 VDC.
1
2
AC or DC
POWER
Required External Fuse:
5 A max, Slow Blow
POWER CONNECTOR
+
-
