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42
AF24-SR US and AF24-MFT US + P-100… Electrical Check-out Procedure
STEP
Procedure
Expected Response
Gives Expected Response
Go To Step…
Does Not Give
Expected Response
Go To Step…
1.
Control signal is applied to actuator.
Actuator will move to its “Control
Signal” position.
Actuator operates properly
Step 7.
No response at all
Step 2.
Operation is reversed
Step 3.
Does not drive toward "Control
Signal Position"
Step 4.
2.
Check power wiring.
Correct any problems.
See Note 1.
Power supply rating should be
7
the
total power requirement of the
actuator(s). Minimum voltage of
19.2 VAC or 21.6 VDC.
Power wiring corrected, actuator
begins to drive
Step 1.
Power wiring corrected, actuator still
does not drive
Step 4.
3.
Turn reversing switch to the correct
position. Make sure the switch is
turned all the way left or right.
Actuator will move to its “Control
Signal” position.
Actuator operates properly
Step 7.
Does not drive toward “Control
Signal Position”
Step 4.
4.
Make sure the control signal positive
(+) is connected to Wire No. 3 and
control signal negative (-) is
connected to wire No. 1. Most
control problems are caused by
reversing these two wires. Verify
that the reversing switch is all the
way CCW or CW.
Drives to “Control Signal” position.
Actuator operates properly
Step 7.
Step 5.
5.
Check input signal with a digital volt
meter (DVM). Make sure the input
is within the range of the actuator.
For AF24-SR US this is 2 to 10 VDC
or 4 to 20 mA.
NOTE:
The input signal must be
above the 2 VDC or 4 mA to have
the actuator move.
Input voltage or current should be
±1% of what controller's adjustment
or programming
indicate.
Controller output (actuator input)
is correct. Input Polarity Correct
Step 6.
Reprogram, adjust repair or replace
controller as needed
Step 1.
7.
Check damper torque requirement.
Torque requirement is actuator’s
minimum torque.
Defective Actuator.
Replace Actuator -
See Note 2.
Recalculate actuator requirement and
correct installation.
8.
Actuator works properly. Test
controller by following controller
manufacturer's instructions.
NOTE 1
Check that the transformer(s) are sized properly.
s )FACOMMONTRANSFORMERISUSEDMAKESURETHATPOLARITYISOBSERVEDONTHESECONDARY4HISMEANSCONNECTALL.OWIRESTOONELEGOFTHE
transformer and all No. 2 wires to the other leg of the transformer.
s )FMULTIPLETRANSFORMERSAREUSEDWITHONECONTROLSIGNALMAKESUREALL.OWIRESARETIEDTOGETHERANDTIEDTOCONTROLSIGNALNEGATIVE
s #ONTROLLERSANDACTUATORSMUSTHAVESEPARATE6!#6$#POWERSOURCES
NOTE 2
If failure occurs within 5 years from original installation date, notify Belimo and give details of the application.
Startup and Checkout
Instructions For AF24-SR US and AF24-MFT US + P-100…
K20901 - 01/09 - Subject to change. © Belimo Air
controls (USA), Inc.
