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DECS-150 Troubleshooting
27 • Troubleshooting
The following troubleshooting procedures assume the excitation system components are properly
matched, fully operational, and correctly connected. If you do not obtain the results that you expect from
the DECS-150, first check the programmable settings for the appropriate function.
Communications
BESTCOMSPlus Metering Incorrect
If power factor, var, or watt readings are significantly different from the expected readings for a known
load, verify that the B-phase current sensing input of the DECS-150 is connected to a CT on phase B and
not phases A or C.
No Communication
If communication with the DECS-150 cannot be initiated, check the connections at the communication
ports.
No Communication Through the USB Port
A failure to establish communication through the USB port may be caused by a failure of the automatic
installation of the DECS-150 USB driver in Windows
®
. This condition is indicated by a Driver Software
Installation error message. To install the DECS-150 USB driver manually, perform the following steps.
Step 1: Open the Windows Device Manager. Under Other Devices, right-click on DECS-150 (or Unknown
Device) and select Properties.
Step 2: In the Properties window, select the Driver tab and click the Update Driver button.
Step 3: Select "Browse my computer for driver software" and then navigate to:
C:\Program Files\Basler Electric\USB Device Drivers\USBIO
Install the USB driver software. Successful installation will be indicated by a confirmation message.
General Operation
Machine Voltage Does Not Build
Step 1: Verify that all wiring is properly connected. Refer to the Typical Connections section.
If wiring is improperly connected or loose, reconnect wiring properly.
If wiring connections are correct, proceed to Step 2.
Step 2: Verify that the machine is spinning at rated speed.
If the machine is not up to rated speed, increase machine speed to the rated value.
If the machine is spinning at rated speed, proceed to Step 3.
Step 3: For PMG power, check for correct input power to the DECS-150. Refer to the Specifications
section for input power requirements.
If voltage is not present, refer to the machine manual for repair procedures (PMG system only).
If voltage is present, proceed to Step 4.
Step 3a: If the DECS-150 is being shunt powered (non-PMG) mode, verify that the residual voltage
applied to the power input is at least 6 Vac.
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