If a switch will not turn on at all (and fuses are OK) then perhaps disconnect a WORKING
switch (they are all identical) from its DIN socket on the CP15 front panel and connect the
suspicious switch instead and check again. IF the switch now works, then the CP15 internal
circuitry for the original switch socket may be defective, otherwise the switch itself is
defective.
17.11 Checking the Pressure Switches
The hydraulics incorporates two pressure sensitive switches, P1 and P2, placed as indicated
on the previous hydraulics figure. They are monitored by LEDs next to the P1 and P2 sockets
on the Compact 15 front panel.
P1 is the main switch, connected to the hyd. pump output pressure. The P1 switch contact is
normally closed and must OPEN at EXCESS pressure, turning OFF the P1 LED. This is used
to detect that LOWER PLATE, DROP, LOWER CATCH or RAISE PLATE mode has been
completed. But, as the hyd. pressure during catch lowering MAY raise to a level close to and
sometimes exceeding the excess pressure (especially under cold conditions), an additional
switch P2 (with a normally open contact) has been applied for sensing of the (rather low)
pressure of the RETURN oil from the raise weight cylinder DURING catch lowering, a
pressure that disappears (P2 LED turns OFF), when the catch has reached its bottom position.
To check P1/P2 functioning, use the following procedures:
17.11.1 P1 check:
1) First check that the P1 LED is ON (motor not running). If so, go to step 2. If not, first
check fuses (see 16.3). If still not, then short-circuit the two P1 terminals, which must
cause P1 to turn on. If still not, then check the P1 cable to the P1 socket on the Compact
15 front panel.
2) Press LC button for 2 seconds or so (the catch should be low, the plate may be in any
height) and check that the P1 LED turns off all the time WHILE pressing, and that it
turns on again within 1 second after LC button release. Repeat several times to make
sure.
To Next Page
Loading...