Operating Instructions

SED2 VFD Startup, Operation, and Maintenance Manual
88 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.