October 2021
Service Manual
VCIOM-16909-EN Rev. 0
5
Section 2: Maintenance
Maintenance
Section 2: Maintenance
!
CAUTION
This CAUTION only applies for FQ actuators (Fail-Safe Actuators). Maintenance work on open
actuators may only be conducted if these are de-energized. Re-energizing during maintenance
is strictly prohibited. Work on the electrical system or equipment must be carried out only in
accordance with electrical regulations by a qualified electrician or by specially instructed personnel
under the control and supervision of a qualified electrician.
!
CAUTION
This CAUTION only applies for FQ actuators (Fail-Safe Actuators). When the actuator is de-energized,
the actuator will return to the fail-safe position. If this is not the case, inspect the shaft valve for a
mechanical jam condition. This condition might increase the torque requirement and increase
stroke time. To avoid this condition, it is recommended to perform routine checks of the fail-safe
function, check the operating time and smoothness of the running in fail-safe operation at least
every 3 months.
!
CAUTION
This CAUTION only applies for FQ actuators (Fail-Safe Actuators). The actuator has a pre-stressed coil
spring or disk spring assembly, when undoing the flange mounting bolts, the spring force against the
valve can cause the actuator to turn abruptly or become loose from the valve. Improper disassembly
may lead to both damage to the actuator as well as serious injuries! If maintenance work is needed
requiring the actuator to be disassembled, contact Emerson regarding detailed instructions and/or
special purpose tools for relaxing the spring assembly.
!
CAUTION
For explosionproof actuators, it is necessary before opening the cover to wait a certain time
after switching off, see explosion protection sticker (Figure 1). Following times are specified for
the actuators (it applies for all RTS actuators).
•
CM32: 5 min.
•
CM64: 10 min.
