Troubleshooting; No Keypad Display - Display Contrast Adjustment - Baldor 22H series Installation & Operating Manual

Section 5

Troubleshooting

No Keypad Display - Display Contrast Adjustment

Action
Apply Power
Press DISP key
Press SHIFT key 2 times Accesses display contrast
Press Y or
key
Press ENTER key
MN722
Baldor Series 22H Controls require very little maintenance and should provide years of
trouble free operation when installed and applied correctly. Occasional visual inspection
should be considered to insure tight wiring connections and to avoid the build up of any
dust, dirt, or foreign debris which can reduce heat dissipation. The control should be
mounted in a location that protects the internal circuits and external wiring from moisture
or liquid contaminants.
When a fault condition occurs, motor operation stops and the fault is displayed on the
Keypad Display. If a REGEN FLT is displayed, this indicates a fault in the converter
section of the control. To determine the specific converter section fault, the keypad must
be moved to the Converting Control Board keypad connector. The fault log can be
examined and the specific faults will help to further isolate the failure. A list of possible
Converting Control Board Fault Messages is given in Table 5-1. Other fault messages
that pertain to the Power Output Control Board are given in Table 5-2.
When a fault has been identified, all input power must be removed from the control to
avoid the possibility of electrical shock. The servicing of this equipment should be
handled by a qualified electrical service technician experienced in the area of high power
electronics.
It is important to familiarize yourself with the following information before attempting any
troubleshooting or service of the control. Most troubleshooting can be performed using
only a digital voltmeter having an input impedance exceeding 1 megOhm. In some
cases, an oscilloscope with 5 MHZ minimum bandwidth may be useful. Before consulting
the factory, check that all power and control wiring is correct and installed per the
recommendations given in this manual.
If there is no visible display, use the following procedure to adjust the contrast of the
display.
Description
No visible display.
Puts control in Display mode.
adjustment.
Adjusts display contrast
(intensity).
Saves display contrast
adjustment level and exits to
display mode.
Display
Display mode with nothing visible.
Comments
Troubleshooting 5-1