DHP-UM-026
Val Controls A/S
Limfjordsvej 3
DK-6715 Esbjerg N
Tel. +45 7547 0600
Fax +45 7547 0611
www.valcontrols.com
Revision: 2
5/7
If the difference is less 100:
1.
Verify that the position sensor is connected to the actuator
If the difference is less 1500:
1.
Increase signal span from the sensor: See sensor manual
The difference between the Open ADC value and the 50% ADC value shall be approximately equal
to the difference between the Close ADC value and 50% ADC value.
1.
Check the signal from the position sensor
2.3
Test the control loop / AI0
Send 4mA followed by a 20mA signal from DCS or a loop calibrator
Push Status
1.Live status and push down arrow down until SP-mA is shown.
From DCS or loop calibrator IHP24 Live menu - SP-mA
4mA
20mA
If signals are 0 mA
1.
Check wiring
If 4 mA and 20 mA signals are “off”
1.
Perform a signal calibration of AI0/Control loop: See IHP24 manual
2.4
Test the transmitter loop / AO0
Verify that the position signal transmitted from the IHP24 and the position signal received by DCS
or loop calibrator are identical
Push Status
1.Live status and push down arrow down until TM-mA is shown.
IHP24 Live menu - TM-mA
Readout from DCS or loop calibrator
If TM-mA is 3.5 mA
1.
Verify that there are no errors in the error log
If 0 mA is received by DCS or loop calibrator
1.
Check wiring
1.
Check if the sensor is active or passive. AO0 is for use of passive transmitters, i.e. output is
active: See IHP24 manual
