3
WIRING CONNECTIONS
All conductors should meet
voltage and current ratings for
each terminal. Also, cabling
should conform to appropriate
standards of good installation,
local codes and regulations. It
is recommended that power
supplied to the unit be
protected by a fuse or circuit
breaker. When wiring the unit,
use the numbers on the label
to identify the position
number with the proper
function. Strip the wire,
leaving approximately 1/4" (6
mm) of bare wire exposed
(stranded wire should be
tinned with solder). Insert the
wire into the terminal, and
tighten the screw until the
wire is clamped tightly.
INPUT AND POWER/OUTPUT CONNECTIONS
INPUT
When connecting the RTD or resistance device, be certain that the
connections are clean and tight. Attach the device to terminals #8 and #9. Install
a copper sense lead of the same gauge as those used to connect the device.
Attach one end of the wire at the probe where the lead connected to terminal #8
is attached and the other end to terminal #7. This configuration will provide
complete lead wire compensation. If a sense wire is not utilized, then Terminal
#7 should be shorted to terminal #8. To avoid errors due to lead wire resistance,
field calibration should be performed with a series resistance equal to the total
lead resistance in the system. Always refer to the probe manufacturer’s
recommendations for mounting, temperature range, shielding, etc.
OUTPUT
Connect the output signal wires to the desired output terminals. For voltage
output, use terminals #4 and #6; for current output, use terminals #1 and #3
observing proper polarity. Only one output may be used at a time. The unit is
factory set for a 4 to 20 mA output. The voltage output will track the current
output linearly within ±2.5% deviation of range endpoints.
To select 0 to 20 mA, output you must open the case and cut the wire jumper.
The jumper is located to the left side of the board as shown in the drawing.
POWER
Connect DC power to terminals #10 and #12 observing proper polarity. Be
certain DC power is within the 9 to 32 VDC specifications.
POWER LED
The IRMA has a green LED located on the front to indicate that power is
applied to the unit.
DIP SWITCH SETTING DESCRIPTIONS
Range switch settings (ON = 1 OFF = 0)
FACTORY SETTINGS
The unit is shipped from the factory calibrated for a 4 to 20 mA output using
a type 385 RTD in range 0. The IRMA should be Field calibrated by the
operator for the application environment it will be used in. If the unit is not
recalibrated by the operator, the following table lists the temperature ranges for
each RTD type.
TROUBLESHOOTING
For further technical assistance, contact technical support at the appropriate
company numbers listed.
Remove this
side of the
unit case.
WIRE JUMPER
ERROR
POWER
VDC+
10
RTD(S)
7
V+
4
I+
1
VDC-
RTD(+)
12
11
9
8
6
5
V-
3
2
I-
POWER SUPPLY
9 to 32 VDC
VOLTAGE METER
OR
CURRENT METER
MONITORING INSTRUMENT
RTD(-)
8
7
9
RTD
S
-
+
-
RTD
+
7
S
8
9
RTD
7
S
8
+
9
-
3-WIRE RTD
4-WIRE RTD
N.C.
2-WIRE RTD
SWITCH
LABEL
DESCRIPTION
1
OUTPUT CAL
Output Calibration
2
FIELD CAL
Field Calibration
3
BASIC CAL
Basic Calibration
4
385/392
RTD Type
5
OPEN SEN UP/DN
Open Sensor Detection -
Upscale (ON) / Downscale (OFF)
6
RTD/OHMS
Select Input Type -
Ohms (ON) / RTD (OFF)
7
8
RANGE
Sensor Range - 2 switch
combination setting
DIP SWITCH
RANGE
7
8
0
0
0
1
0
1
2
1
0
3
1
1
TYPE
385
RANGE
0
NOMINAL FACTORY FIELD CALIBRATION
TEMPERATURE RANGE
150°C to 606°C
392
0
150°C to 595°C