412LXR Series Product Manual
Chapter 3 - How to Use the 412LXR
25
Side and Inverted Mounting Concerns
Side Mounting
•
Cable transport modules are NOT to be used on side mounted positioners with travels greater than
600 mm due to cable drag.
Inverted Mounting
•
Cable transport modules are NOT to be used on inverted mounted positioners with travels greater
than 450 mm due to cable drag. Contact factory for special bracketry.
Setting Travel Limit Sensors
The LXR is supplied with over-travel limit sensors. Set the position of the sensors before applying power.
The limit sensors are set at the factory for maximum travel. These factory settings only allow for 3mm
(0.12”) before the carriage contacts the deceleration bumper. In slow speed applications this may be
adequate, however as the top speed of the application increases the required deceleration distance
increases. To determine the safe Deceleration Distance the Maximum Speed and the Maximum
Obtainable Deceleration Rate must be known or calculated. The maximum speed should be known
from your application requirements. Velocity limits should be set in your program or in your amplifier to
cause a fault if the speed exceeds this value. The maximum deceleration is a factor of load and available
peak force of the table. Using F = ma, calculate maximum acceleration and then required deceleration
distance. See the following example for calculating maximum deceleration for an application with a
payload = 25kg on a 412LXR-D15 (12 pole motor), with a maximum speed of 1.5 m/s.
Payload mass = 25 kg, Carriage mass = 12.3 kg
Total mass = 37.3 kg
Maximum Speed = 1.5 m/sec
Available peak force at 1.5 m/sec = 800N (See Chapter 2, Force / Speed Curve)
Thus: F = ma
a = F/m
a = 800N / 37.3kg
21.4 m/sec
2
or 2.1g’s
The Maximum Obtainable Deceleration Rate for this application is 21.4 m/sec
2
.
Now, calculate the Deceleration Distance for linear deceleration:
First… find the Deceleration time:
Ta = Max Velocity / Deceleration Rate
Ta = 1.5m/sec / 21.4 m/sec
2
0.070 seconds
Second… find the Deceleration Distance:
Distance = ((Max Velocity) * (Ta)) / 2
Distance = ((1.5 m/sec) * (0.070)) / 2
0.053 meters or 53 mm
This means that both the positive and negative limit switch targets must be moved inward by 53 mm.
The limit deceleration rate should be set to 21.4 meters/sec
2
.
53 mm
53 mm
