Specifications

SED2 VFD Startup, Operation, and Maintenance Manual
82 Siemens Building Technologies, Inc.
Troubleshooting the Operator Panel
If the display shows P – – – – or it is a blank screen, make certain
connection pins are not bent on the I/O module (Figure 41) and that
connection openings on the back of the operator panel are free from
obstructions (Figure 42).
NOTE: For Frame Size D through F, verify ribbon cable connector is
not loose or damaged. Verify functionality of the operator
panel by plugging it directly into the control module.
VERIFY THAT
CONNECTION
PINS ARE
NOT BENT
VERIFY THAT
INDICATING
LIGHTS ARE
ILLUMINATING
Figure 41. Connection Pins on I/O
Module.
VERIFY THAT
CONNECTION
OPENINGS ARE
FREE FROM
OBSTRUCTIONS
Figure 42. Connection Openings on
Back Side of Operator Panel.