TSI Instruments FHC50, Operation And Service Manual

Page: 72 / 107

Part Two
64
Troubleshooting Chart
Symptom Possible Cause Corrective Action
Menu soft key
not displayed. DISPL
SOFTKEYS set
to OFF. Press left and right quick-
keys and right-most soft key
simultaneously to gain
access to menu system. Set
DISPL SOFTKEYS item in
CONFIGURE menu to ON.
Need to display
model number
and firmware
revision --
Select SELF TEST item in
DIAGNOSTICS menu or
display hello screen by
simultaneously pressing the
three right-most soft keys
while in the running screen.
Controller is not
controlling. Incorrect wiring. Verify correct wiring (see Wiring diagram ; Appendix C).
DIM must be wired exactly as shown.
Damper/Valve
moving opposite
direction. If damper is full open when it should be closed or full
closed when it should be open, go into
CONTROL menu
CONTROL SIG menu item. Change DIRECT to
REVERSE or REVERSE to DIRECT to change control
output direction.
No control output
signal. Go into DIAGNOSTICS menu , CONTROL OUT item. A
number between 0% OPEN and 100% OPEN will be
displayed. Pressing the

key increases the number.
Pressing the

key decreases the number. Measure the
DC voltage between pins 1 and 2 (4-pin connector) on the
controller. Change the
CONTROL OUT value about 40%.
The voltage output should change approximately 4 volts.
Change the
CONTROL OUT value to 50% OPEN . The
voltage should read approximately 5 VDC.
If no change occurs, disconnect control wires on pins 1
and 2 (4-pin connector) and repeat test. If DIM still fails to
change voltage output, DIM is probably defective. If
voltage changed DIM is working, and either wiring or
actuator (VFD) needs to be examined.