Before changing any adjustments, or removing any operating section of a valve, be sure that the electrical controller is supplying the proper information, in the correct sequence, to the valve solenoids (coils).
For a normal Up run, both U1 & U2 solenoids must be energized.
For an Anti-Creep or slow up run, only the U2 solenoid must be energized.
When the elevator is making a normal Up run, and is approaching a floor for which it has been programmed to stop, the U1 solenoid must be de-energized, by some means, at a certain distance below the floor, allowing the valve enough time to respond to the signal so as to smoothly effect a transition from high speed to low speed and to be at a stabilized leveling speed for a distance of 3 - 4 inches before the car reaches the floor. The U2 solenoid must remain energized until the approximate floor level is reached and the motor must be allowed to run for 1 to 1 1/2 seconds after U2 is de-energized so as to obtain the desired soft stop
For a normal Down run, both D1 and D2 solenoids must be energized to obtain full down speed. For a slow or leveling speed Down run, only the D2 solenoid must be energized.
When the elevator is making a normal Down run, and is approaching a floor for which it has been programmed to stop, the D1 solenoid must be de-energized, by some means, at a certain distance above the floor, allowing the valve enough time to respond to the signal so as to smoothly effect a transition from high speed to low speed and to be stabilized leveling speed for a distance of 3-4 inches before the car reaches the floor. The D2 solenoid must remain energized until the approximate floor level is reached.
In the following instructions, the terms CW and CCW are abbreviations for clockwise and counterclockwise. CW means turn to the right. CCW means turn to the left.
Caution
Be absolutely certain that the pressure has been shut off from the valve section of the system before removing or disassembling any part of the valve. Either lower the elevator car down to the pit supports and/or close the main line gate valves and tank valves. Disconnect the main electrical power switch. Always open the manual lowering valve before you close the tank shut-off.
IMPORTANT: After a valve is adjusted according to instructions, if the transition and/or leveling zones are either too long or too short, DO NOT readjust the valve! Move the appropriate switches or vanes/cams.