RHD250 to 4000 (Contrac) ELECTRICAL ROTARY ACTUATOR |  SEI/RHD250/4000-EN REV. A  3 
 
1  Safety 
General information and instructions 
 
 
These instructions are an important part of the product and 
must be retained for future reference. 
Installation, commissioning, and maintenance of the product 
may only be performed by trained specialist personnel who have 
been authorized by the plant operator accordingly. The specialist 
personnel must have read and understood the manual and must 
comply with its instructions. 
For additional information or if specific problems occur that are 
not discussed in these instructions, contact the manufacturer. 
The content of these instructions is neither part of nor an 
amendment to any previous or existing agreement, promise or 
legal relationship. 
Modifications and repairs to the product may only be performed 
if expressly permitted by these instructions. 
Information and symbols on the product must be observed. 
These may not be removed and must be fully legible at all times. 
The operating company must strictly observe the applicable 
national regulations relating to the installation, function testing, 
repair and maintenance of electrical products. 
 
 
 
 
Warnings 
 
 
The warnings in these instructions are structured as follows: 
 
The signal word ‘DANGER’ indicates an imminent danger. 
Failure to observe this information will result in death or 
 
The signal word ‘WARNING’ indicates an imminent danger. 
Failure to observe this information may result in death or 
 
The signal word ‘CAUTION’ indicates an imminent danger. 
Failure to observe this information may result in minor or 
 
The signal word 
‘NOTICE’
 indicates possible material damage. 
 
Note 
‘Note’ indicates useful or important information about the 
product.