2 Product Specification
Linear actuators MC250 • MC253 • MC500 • MC503
Operating Manual Version 2.1 - March 2011 9
Actuator heating If the temperature in the actuator drops below 15 °C, the motor is switched to
heating in the operating pauses. The actuator heating switches off automatically
at a constant temperature of approx. 22 °C. The actuator heating does not affect
the functions of the actuator.
Heating capacity:
• 12.5 W at temperatures from approx. 8 °C to approx.15 °C
• 18 W at temperatures below 8 °C
The heating prevents the build-up of water condensation in the actuator and at the
same time guarantees the smooth running of the gears even at temperatures up
to approx. - 10°C.
Heating operation and motor switch-off are displayed via the LED in the (47)
viewing window.
Table 8 Red LED display on page 30
2.4.4 Open-circuit detection
Open-circuit detection is only available in Continuous mode with an input signal
2 … 10 V DC and 4 … 20 mA.
If the input signal drops below 1 V or 2 mA in Continuous mode, the linear
actuator moves to the limit position set by coding switch S7.
Open-circuit detection is displayed via the green LED in the (47) viewing window.
Table 7 Green LED display on page 30
2.4.5 Set time
The time the spindle nut takes to travel a defined path, is called actuating time.
The actuating time is indicated in s/mm. The actuating time is set by coding switch
S5.
5.3 Set actuating time on page 23
2.4.6 Hysteresis
The differential of the input signal (Y) required after a reversal of the signal
direction so that the spindle nut is moved, is called hysteresis.
It is used to avoid permanent oscillation of the actuator motor around a specific
lift position in the event of slight input signal changes.
5.4 Set hysteresis on page 24
2.4.7 Manual mode and feedback signal
The lift can be manually changed in Manual mode without power supply.
• The electronic motor and control are switched off in Manual mode so that lift
movements by the control are not possible.
• As soon as the linear actuator is switched to Manual mode, the control
switches a signal to Terminal R, if the power supply is on.
6.1 Switching between Manual and Automatic modes on page 29
To Next Page
Loading...
Need help?
General
