Electro Cam PL-1746 Series - Manual (Page 89)

4-44 PLS Functions
Speed Compensation
Backplane
PL-1746 Function Name SLC 500 Mapping Read/ Valid Range for Data
File Index Write
Address Number Capability
Leading Edge M0:S.384- 896- R/W -999.9 to 999.9
Channels 0-31, M0:S.415 958
1word/channel
Trailing Edge
M0:S.448- 1024- R/W -999.9 to 999.9
Channels 0-31, M0:S.479 1086
1word/channel
Screen MAIN SCREEN to FUNCTION MENU SPEED COMP
CH: 1
TE: 20.0
Leading edge compensation (10 msec shown)
Trailing edge compensation (20 msec shown)
Output Channel
To change output channels, move the cursor to the channel number and enter a new
one. You may also INC or DEC the channel number.
To change speed comp values, use the numeric keys or INC and DEC. To enter tenths
of msec, use the decimal point. When entering whole ms values, the decimal point is
not needed: “12 ENT” will result in a value of 12.0.
To program negative speed comp, press the +/- key after entering a number but before
pressing ENT. You may also decrement a value below zero.
Note: Speed compensation requires time to respond to accelerations, and large
scale factors increase that response time.
Description Speed Compensation advances or retards selected outputs a specified amount of time
at any machine speed.
Some devices such as pneumatic cylinders and glue guns require a fixed amount of
time to perform their function. As a machine speeds up, these devices need to be
actuated earlier in the cycle in order to complete their action at the required time. Speed
compensation automatically advances the pulses of specified output channel(s) as the
machine speeds up, maintaining proper synchronization at all speeds. See Chapter 5
for a detailed discussion of speed compensation.
Speed compensation is programmed by entering the response time of the output de-
vice in milliseconds (.001sec). The output will always turn on this number of ms before
the programmed ON position is reached, and turn off this number of ms before the
programmed OFF position is reached. As speed increases, the number of degrees of
advance will automatically increase to maintain the number of ms of advance.
Negative Speed Comp
Negative values of speed compensation cause an output channel to lag its programmed
machine position by the specified number of msec. See Chapter 5 for details on apply-
ing negative speed compensation.
Also see Speed Comp Mode.