Analog Input Calibration; Connect Calibration Equipment; Table 7-1: Ai Calibration Points; Table 7-2: Typical Calibration Point Values - ABB RMC-100 User Manual

WARNING – Bodily injury. Remove power from the RMC to disconnect and reconnect
!
external devices and calibration equipment. Failure to remove power can cause bodily injury or
equipment damage. Review warnings in Potential safety hazards. Plan the calibration
procedures carefully if you must perform several calibrations. You might be required to remove
and reapply power to the RMC several times.
7.1

Analog input calibration

The calibration for analog input (analog input, AI) can be a 3-point or 5-point calibration.
below lists the points for each type of calibration.

Table 7-1: AI calibration points

Type of calibration
3-point
5-point
Typical external devices include 4-20 mA or 1-5 V transmitters. Use the values in
signal (voltage or current) values for calibration points for these types of devices.

Table 7-2: Typical calibration point values

Available calibration
points
Low
25%
50%
75%
100%
IMPORTANT NOTE: To properly calibrate the AI, determine the measurement range and signal
type of the external device.
7.1.1

Connect calibration equipment

A calibrator simulates the external device attached to the controller AI during analog input calibration.
The calibrator applies the signal (voltage or current) values that would otherwise come from the
external device.
NOTICE – Equipment damage. Verify that the voltage or current values from the
calibrator do not exceed the acceptable analog input ranges. Verify that the signal is the
same type as the AI configuration. Do not turn the calibrator on until the AI is configured for
the correct input signal type.
NOTICE – Tainted results. The wire length from the external device to the AI affects the
calibration. Use only wires with the correct length from the RMC to the external device to
connect the calibrator. Or place the calibrator at the location where the external device is
installed.
To prepare and connect the calibration equipment:
1. Power off the RMC.
2. Disconnect the wires from the external device.
3. Turn on the calibrator and set it to the same signal type (voltage or current) as the AI
configuration.
4. Turn the calibrator off.
5. Connect the calibrator to the external device's wire ends. Observe the polarity and connect to
the correct wire: positive probe to the signal wire, and negative probe to the negative or
ground wire.
6. Connect or apply power to the RMC when the calibrator is connected.
Figure 7-1 shows the setup of equipment to calibrate an AI with voltage or current.
Points
Low, 50%, and 100%
Low, 25%, 50%, 75% and 100%
Current (in mA) for 4-20 mA range
4
8
12
16
20
Table 7-1
Table 7-2
Voltage (in volts) for 1-5 V range
1
2
3
4
5
21 05 55 2MN A E | RM C-1 00 | 1 2 7
for the