244 Table Base Cover Limit Switches Test and Repair
The base cover limit switches prevent injury and/or equipment damage by disabling all table functions if any pressure is applied to the base cover.
The control box supplies approximately 5 VDC to the four base cover limit switches. During normal operating conditions, current flows thru all four normally-closed switches, then to the hand control inlet.
If pressure is applied to the spring-loaded base cover, one or more of the limit switches will be tripped. When any of the limit switches are tripped, there is no current supplied to the hand control, and no table functions will operate.
If a problem is suspected, Refer to: Power To The Table for troubleshooting.
There are four Base Cover Limit Switches. One limit switch located at each leveling foot.
To access a limit switch lift the base cover at the leveling foot.
Limit Switch Test
It is possible to perform this test without removing the switch.
1.Set meter to 200 Ω.
2.Tag and disconnect wires from switch terminals.
After testing the switch, the wires must be reconnected to the same switch terminals. Failure to comply will result in table malfunction.
3.Place meter probes on switch terminals as shown. Check switch tripped and untripped.
| With Switch Tripped | ||
|---|---|---|
| Meter Reading | Status | Required Action |
| OL |
|
Limit switch OK |
| Less than 5 Ω |
|
Replace switch |
| With Switch Untripped | ||
|---|---|---|
| Meter Reading | Status | Required Action |
| OL |
|
Replace switch |
| Less than 5 Ω |
|
Limit switch OK |
