TSI Instruments FHC50 User Manual

Technical Section
63
Troubleshooting Chart
Symptom
Possible Cause
Corrective Action
Display is blank.
Fuse is blown.
Measure voltage at pins 1 and 2 on DIM 4-pin connector.
The voltage should nominally be:
24 to 40 VDC when using TSI electric actuators.
24 to 30 VAC when using motor speed drives.
If correct voltage is measured, internal DIM fuse is
probably blown. Unplug 4-pin connector from DIM for 2
minutes. The internal fuse will automatically reset. Plug
unit back in and check display. If display is still blank,
check all wiring, etc.
If approximately 5 volts is measured, the fuse in the
electric actuator is blown. Disconnect power to the
electric actuator for two minutes to reset fuse.
Disconnecting power requires either shutting off circuit
breaker or disconnecting the wires on pins 1 and 2 on the
electric actuator.
If zero volts are measured, see No power to DIM.
Verify circuit breaker is on.
Verify transformer primary measures 110 VAC.
Verify transformer secondary measures 24 to 30 VAC.
If using DC power output from TSI electric actuator:
Verify electric actuator is receiving 24 to 30 VAC between
pins 1 and 2.
Verify 18 to 40 VDC is found between pins 3 and 4 of the
electric actuator.
No power to DIM.
Verify circuit breaker is on.
Verify transformer primary measures 110 VAC.
Verify transformer secondary measures 24 to 30 VAC.
Verify 24 to 40 VDC is found between pins 3 and 4 of the
electric actuator.
Verify DIM voltage on pins 1 and 2 is 24 to 30 VAC for
VFD systems, or 32 to 40 VDC on electric actuators.
DIM is defective.
If proper voltage is found between pins 1 and 2 of the
DIM, all wiring has been checked, fuses have been reset,
and screen is still blank, the DIM is probably defective.
Replace DIM.

TSI Instruments FHC50 Specifications

General

Brand	TSI Instruments
Model	FHC50
Category	Controller
Language	English