7 Maintenance, Care and Repairs
Linear actuators MC250 • MC253 • MC500 • MC503
30 Version 2.1 - March 2011 Operating Manual
6.2 LED display
The LEDs in the viewing window (47) indicate operating states or faults.
10.2 Operating faults checklist on page 32
7 Maintenance, Care and Repairs
The linear actuator is low-maintenance. No routine or periodic maintenance is
required.
8 Spare parts
Check the data on the linear actuator rating plate when ordering optional extras
or spare parts. The data on the rating plate is decisive for linear actuator technical
data and mains power supply requirements.
Green LED Operating status / fault
duration
Normal operation, standby
The LED illuminates continuously, actuator awaits drive
command.
Standard Operation
Actuator carries out drive command.
Short - long rhythm
Open-circuit detection
In operating modes 2 … 10 V DC or 4 … 20 mA, the input
signal has dropped below 1 V or below 2 mA.
2.4.4 Open-circuit detection on page 9
Long - long rhythm
Lock detection (only in Continuous mode)
The linear actuator is mechanically locked.
2.4.2 Lock detection on page 8
Long - short rhythm
Continuous signal on terminals 2 and 3
An initialisation run starts in the event of simultaneous
control signal on terminals 2 and 3 (max. 4 attempts). The
linear actuator switches off automatically after 4 failed
attempts.
Table 7 Green LED display
Red LED Operating status / fault
OFF
Temperature within normal range
duration
Heating operation
Actuator heating on page 9
Flashes regularly
Actuator overheats
Overheating protection on page 8
Table 8 Red LED display
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