625 Table Base Up / Down Function Troubleshooting
This illustration shows only the components that affect the Base Up/Down function. A detailed description of current flow during this function also appears below.
Base Down Limit Switch
•Base Down will not operate if switch is tripped.
Base Up Limit Switch
•Base Up will not operate if switch is tripped.
230 VAC models only
Line voltage (230 VAC) is supplied thru two fuses (located by the IEC inlet) to a transformer that reduces the line voltage to 115 VAC before it reaches the PC Board.
If an over current condition* is detected the PC board will beep and all power functions will be disabled. Release the function button, remove load, then retry function.
*Weight limit exceeded, mechanical binding, etc.
Power to Foot / Hand Control
115VAC is supplied thru the two primary fuses, F1 and F2, to the transformer on the PC board. F3 fuse protects the transformer.
The transformer reduces the line voltage and supplies 14VAC to the foot/hand control.
Base Up Operation
If the Base Up limit switch is tripped (open), the Base Up function will not operate.
When the Base Up function is activated, current (14 VAC) flows thru the up function foot switch (N.O.), then back to the PC board. Circuitry on the PC Board energizes the base motor. F4 fuse protects the base motor.
When the base function is energized, current flows to the actuator motor. When current flows to the actuator, the actuator motor runs and raises the table.
Actuator motor runs until:
1.Foot/Hand control button is released.
2.Base Up limit switch is tripped.
3.Fuse(s) opens (blows) - Primary, Base Motor, Transformer fuse.
4.Over-current condition is detected.
Base Down Operation
If the Base Down limit switch is tripped (open), the Base Down function will not operate.
When the Base Down function is activated, current (14 VAC) flows thru the down function foot switch (N.O.), then back to the PC board. Circuitry on the PC Board energizes the base motor. F4 fuse protects the base motor.
When the base function is energized, current flows to the actuator motor. When current flows to the actuator, the actuator motor runs and lowers the table.
Actuator motor runs until:
1.Foot/Hand control button is released.
2.Base Down limit switch is tripped.
3.Fuse(s) opens (blows) - Primary, Base Motor, Transformer fuse.
4.Over-current condition is detected.
