Linak Desk Frame 1 Assembly Manual page 22

Desk is uneven
Appendix
What is the Control Box Thinking?
There are many clever procedures, checks and measurements performed in the control box. Here is a brief description of
what the control box is trying to accomplish while it is activating an application:
• Safe activation of the application
o Parallel, even movement of all desk legs in the application is critical.
» The control box does not directly know the position of each desk leg. Instead, the position of each leg
» Motor cable disconnections are also detected as errors.
o If PIEZO technology is present in the desk leg, the control box monitors for PIEZO "collision" signals from
each channel. When a PIEZO signal is sensed, movement is immediately stopped and, if there is room, the
system is ran in the opposite direction a small distance.
o Anytime the control sees an incomplete signal, or more than one signal (multiple keys pressed, multiple
desk switches activated at the same time), an error is determined and no movement is allowed at that
moment. This is to prevent an action of movement that is not intended by the user.
• Protection from equipment damage
o Internal temperature of the control box is monitored.
o Maximum current draw for each motor channel, as well as the system as a whole, is measured. When the
current exceeds an allowable limit, an error is presented.
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5. Also, be aware if the control box has a special configuration: If the desk is programmed
with a lower stroke limit, so as to avoid a collision with something like a file cabinet, it is
possible that it also has a custom, longer Forced Initialization Time. This is the time
required to hold Down before initialization begins. Sometimes this is 10 seconds or longer.
6. If you have a standard control box without a special configuration (i.e. "Plug & Play"),
try to initialize each leg in Channel 1 by itself, with nothing else plugged into the motor
channels on the control box. Also, swap the motor cables so that a different motor cable
is used to initialize Channel 1 by itself. The problem could be a faulty desk leg or a faulty
motor cable.
1. Desk is uneven (P4)
is constantly calculated via Hall pulses from each motor. The legs on a single reference are not
allowed to be more than +/- 5 Hall pulses out of sync. For a standard DL, this amounts to +/- 0.55 mm.