Ampcontrol Pty Ltd
– ABN 28 000 915 542
GG2 DISPLAY USER MANUAL
GG2B023 Version 3
– JUNE/19
Uncontrolled Copy - Refer to Ampcontrol Website for Latest Version
Page 55 of 82
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The GENERAL screen may be used to configure the following:
Table 12: iMAC - Protocol Configuration - General
Field Name
Value
VOLTAGE
(WARN)
Specifies the power supply warning voltage. Once the supply
voltage to the display drops below this value, the supply voltage
warning bit is set. Validity: 0-24V.
VOLTAGE
(ALARM)
Specifies the iMAC address for analogue (4-20mA output)
information. Once the supply voltage to the display drops below
this value, the supply voltage alarm bit is set. Validity: 0-24V.
ANALOG EXC
TRG
Specifies the setting for the analogue exception trigger. The
setting is the percentage difference between successive
analogue sample values that will cause an exception scan,
measurements are taken at 1Hz. Validity: 0-99.0.
4-20mA
The GG2 Display can drive a 4-20mA loop current. The operation of the 4-20mA loop is independent of
the other communications (iMAC and Modbus).
6.4.5.1 Behaviour
The 4-20mA output is being monitored by the GG2 Display to ensure that; the desired output is being
driven and that the full range of outputs should be able to be driven. In cases of excessive loop
impedance, a device fault will occur. The estimated 4-20mA loop impedance can be seen on the
“SYSTEM INFO” screens (Section 6.6.2).
6.4.5.2 Connection
The 4-20mA output should be connected from the 4-20mA out pin through the measurement device back
to the ground pin of the system interface connector.
6.4.5.3 Settings
Activation of the 4-20mA output is done from the
“4-20mA SETTINGS” screen, refer to Section 6.1.2.
Table 13: 4-20mA Settings
Field Name
Value
ACTIVATION
Options: TRUE or FALSE. Specifies if the 4-20mA loop is
powered
WARMUP/FAULT
Options: HIGH or LOW. Specifies whether the warmup/fault
range is high or low. i.e.
LOW: warmup = 3mA, fault = 2mA.
HIGH: warmup 21mA, fault = 22mA.
6.4.5.4 Calibration
Before the start of calibration, if the GG2 Display has spent considerable time at low or elevated
temperatures, please allow the device to stabilise to room temperature in powered-up operational (no
fault) state for 24 hours before beginning calibration.
If the GG2 Display has not experienced exposure to temperature extremes the apparatus should be left
