Figure 2-6 Analog Input Wiring Connections - Honeywell VPR100 User Manual

Analog Input Connections
See Table 1-1 Specifications for acceptable voltage and current signal inputs. Connect current and voltage
inputs to the appropriately labeled terminals as in Figure 2-5.
CAUTION
Safety isolation exceeding the safe working level of 30 V RMS (42.4 V peak) is not provided between analog
inputs. If the working voltage of any analog input exceeds this level, use suitable wire gauge and insulation on
all analog inputs, and use proper safety precautions when handling all analog input wiring.
ATTENTION
1. For current inputs, shunt resistors are not provided.
2. When required, current shunts are mounted on these terminals, see Figure 2-5. Use Part No. 311285 for
4-20 mA input conversion to 1-5 V.
3. Thermocouples may be grounded or ungrounded, since each point is isolated using solid state relays.
4. Connect RTD input leads to the proper terminals for the RTD input card. Note that an RTD has three
leads. The A, B, and C leads must be equal length and gage, i.e., the same resistance.
5. In the same instrument, avoid the following input ground connections.
•
Both a thermocouple input tied to ground and an RTD input tied to ground. The thermocouple
measurement would be incorrect.
•
A thermocouple at a common mode voltage and an RTD tied to ground. The common mode voltage
would be connected to the ground.
•
A thermocouple at a common mode voltage and an RTD which is ungrounded. The common mode
voltage would be placed on the RTD.
A+
C-
B
mV or volts
ATTENTION
For these expanded input ranges
0 to 10V
0 to 20V
-10V to +10V
-20V to +20V
you must
1) change jumper settings on the AI circuit board
2) program the selected AI accordingly.
See section 9.2 Changing Analog Input Ranges.
12/00
A+
mV or volt
source
C-
B
Thermocouple

Figure 2-6 Analog Input Wiring Connections

VPR & VRX – User Manual
Installation
A+
C-
B
RTD
A+
4-20mA
250
source
ohm
C-
B
4-20 mA
25