260
System Manual – MOVIDRIVE® compact Drive Inverters
4
Limit switches
Project Planning
4.22
Limit switches
Limit switch
processing
Limit switch processing makes sure that the travel range of a drive is observed. To do
this, it is possible to program the binary inputs to the functions "/LIM. SWITCH CW" and
"/LIM. SWITCH CCW." The limit switches are connected to these binary inputs. The limit
switches must be '0' active and continuously actuated in the limit switch area (= move-
ment up to limit switch).
"0" active means:
•
Limit switch not contacted (= not activated)
→
24 V signal
•
Limit switch contacted (= actuated)
→
0 V signal
•
The limit switches must supply a "1" signal continuously in the travel range.
Limit switch
contacted
("0" signal)
•
The drive is stopped with the emergency ramp t14/t24.
•
When brake function is activated, the brake is applied.
•
In IPOS
plus®
operating modes, contacting a limit switch generates a fault message.
A reset is then required in order to move clear of the limit switch (
→
IPOS
plus®
man-
ual).
Moving drive
clear from limit
switch
•
The inverter must be enabled at the binary inputs.
•
Hold control must be inactive.
•
The inverter receives a setpoint value from the setpoint source that guides it in the
right direction.
•
When the setpoint stop function is activated: Setpoint > Start setpoint
Behavior of the
drive when
moving clear
•
Once a limit switch is hit, the drive can be moved clear of the limit switch in the other
direction.
•
When the brake function is activated, the brake is first released and then the drive is
moved clear ('0'
→
'1' signal). The limit switches must supply a '1' signal continuously
in the travel range.
If the drive leaves the limit switch range without having been moved clear of the switch
automatically, for example when the drive is moved manually, the drive can still be
moved afterwards in the standard operating mode.
Limit switch
monitoring
•
The inverter checks whether
– limit switches are missing
– there is a break in the wire or
– the limit switches are connected incorrectly.
If this is the case, the inverter triggers an emergency stop and displays fault F27,
"Limit switches missing."
Summary of Contents for MOVIDRIVE compact MCH41A
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