Motor control unit DCM31
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n) Electricity stop / obstruction detection
- The control unit learns the maximum motor current for each direction of travel and
each motor.
- If this value plus the adjustable allowance value [M.A7]..[M.b0] is exceeded after
the teaching run, a stop, release or reversing is executed depending on the [M.b3]
setting and the direction of travel.
- Higher force values [M.A7]..[M.b0] result in the switching off reacting with less
sensitivity (more force).
- Important: If the setting is too insensitive there is a risk of injuries due to late or
lack of switching off!
- An electricity stop is displayed by the error code {Er.27} or {Er.28}.
- During the motor startup the electricity stop is inactive for the adjustable time set
via [M.A6] (startup current faded out).
- It is only necessary to change the allowance value if the gate stops via electricity
stop, although the travel was not disrupted by an obstruction, or does not stop
despite an obstruction.
- The force values are corrected slightly with each uninterrupted travel from limit
switch to limit switch. This achieves adaptation to aging of the system, and summer
/ winter use.
- During the teaching runs the electricity stop is inactive.
- The motor voltage in smooth travel and along the travel path [M.A1]..[M.A4] affects
the force values for the electricity stop. If the motor voltage is changed the closing
forces must be checked and if necessary corrected.
- [M.b3] may only be set to 00, if safety and compliance with the closing forces is
ensured by external equipment!
- The function of the electricity stop [M.b3] can be adjusted to “without limit switch”
[M.C6] = 02 for the type of limit switch, but always has the function stop in open
and close (as end position detection).
o) Force values
- [M.A7]..[M.b0] can be used to change the control unit’s force values, separately for
each motor, in the open and close direction.
- During operation without limit switch [M.C6] = 02, the force values equal the current
values at which the control unit switches off and are interpreted as the end position.
- During operation with limit switches the typical motor currents are teaching during
the teaching runs. The force values that can be set in [M.A7]..[M.b0] are allowance
values. If the teaching current is exceeded by more than the allowance value, the
control unit interprets it as an obstruction.
p) Closing edge safety device (SE)
- An 8K2 safety strip or an opto-electronic terminal strip (OSE) can be connected to
the SE input. [M.b6] must be set accordingly.
- The status of the SE input is represented by the LED behind the terminals
[Kl.23]+[Kl.24].
- In the event of a short circuit or interruption the SE input is actuated.
- A motor start while SE input is actuated is only possible if the closing edge safety
device does not have any effect in the relevant direction of travel [M.b6].
- While a motor is running a command at the SE input causes a stop, release or
reversing, depending on the direction of travel and setting [M.b6].
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