Laird Controls North America Inc. MK90 ユーザーズマニュアル
R
02/2000 CATTRON
®
Section 1, Page 21
Operating Procedure – dual pressure keypad controller.
Note that all dual pressure function keys are clearly marked with double arrows on the face of the
pushbutton.
pushbutton.
Your Dual Pressure (DP) function key pushbuttons have been pre-assigned through i-Key
programming for two-step operation. In other words, a second output is tied to the second level of
button depression. Other than the outputs of dual pressure pushbuttons, functional operation of the
keypad controller is the same as the single pressure controller described above.
programming for two-step operation. In other words, a second output is tied to the second level of
button depression. Other than the outputs of dual pressure pushbuttons, functional operation of the
keypad controller is the same as the single pressure controller described above.
Operating principle (dual pressure keypad controllers).
Typically, Dual Pressure (DP) controllers send one of two output commands to the receiver/decoder
from a single button. DP buttons are paired to opposite directions of the same output, (i.e., forward
and reverse). These two buttons will control direction and speed relays. The first level of depression on
each button will command the desired direction and first step of movement (two directions = two
relays). The third relay is operated by either button’s second level of depression to the second speed
output of the controlled equipment. This could be a single relay, or two separate relays assigned for the
second speed step or for the VFD accelerate output (for the button in use).
from a single button. DP buttons are paired to opposite directions of the same output, (i.e., forward
and reverse). These two buttons will control direction and speed relays. The first level of depression on
each button will command the desired direction and first step of movement (two directions = two
relays). The third relay is operated by either button’s second level of depression to the second speed
output of the controlled equipment. This could be a single relay, or two separate relays assigned for the
second speed step or for the VFD accelerate output (for the button in use).
If the DP button is depressed to its first level, first speed is achieved and maintained as long as the
button remains at that level of depression. If the button is depressed to its second level, second speed is
achieved. If the operator releases pressure and allows the button to return to the first level, first speed is
again achieved.
button remains at that level of depression. If the button is depressed to its second level, second speed is
achieved. If the operator releases pressure and allows the button to return to the first level, first speed is
again achieved.
Moving directly from ‘OFF’ to the second level of depression can command second speed if sufficient
pressure is applied. For example, one of two DP buttons labeled ‘FORWARD’ and ‘REVERSE’ is
used at the first pressure level to command the direction and first speed of the equipment. The second
pressure level of the button in use will command a second speed.
pressure is applied. For example, one of two DP buttons labeled ‘FORWARD’ and ‘REVERSE’ is
used at the first pressure level to command the direction and first speed of the equipment. The second
pressure level of the button in use will command a second speed.
END OF SECTION