6
1.4
OPERATION
Do not open the cover when an explosive atmosphere may be present.Never leave the cover open,
in order to avoid any risk of water inlet.
Respect the actuator duty cycle indicated on the identification plate. For example, for a 30% duty
and a 40s operating time, the minimum time between two operations is 93 s. In case of over-hea-
ting, the thermal protection will disrupt the motor power supply in order to limit the actuator body
temperature elevation.
1.5
MAINTENANCE
Regularly check that the actuator explosion-proof
body has not been degraded by a mechanical shock
or any other type of agression. The cable glands
are explosion-proof components and, as such, must
be kept intact.
Check that the glands and the cables aspect is normal and also that there is no risk of water
entering into the actuator (avoid placing the cable glands upwards i.e).
Do not bring any modification of any kind to the actuator.
The actuator mechanical parts are lubricated and do not necessitate any specific maintenance.
In the event of a dismounting/remounting operation, make sure that all moving parts are correctly
lubricated in order to prevent any electric spark. The oil for lubrification must have an auto-ignition
temperature ≥200°C. Please consult Bernard Controls.
Although a thermal protection is built in the motor, it is important to check that there is no risk of
bearings jamming.
Bearings change frequency: 10000h of operation.
Any repair on the explosion proof or the increased safety device requires a prior manufacturer
agreement and generally necessitates to return it to the manufacturer workshop in order to secure
the explosion proof and increased safety protection integrity. Dimensions of explosion proof joints
are specific. Consult BERNARD CONTROLS for information.
1.6
ELECTRICAL AND TEMPERATURE PARAMETERS
The power supply voltage and frequency are indicated on the identification tag and (or) on the electric
wiring diagram.
The minimum ambiant temperature is -20°C and the m40°C unless an other information
is mentioned on the identification tag.
1.7
SPECIAL OPERATION CONDITIONS INCLUDING UNCORRECT
PRACTICES
Duty cycle:
the motors are designed for an intermittent operation ; it means that they should
be stopped for a sufficient period of time after each operation in order to enable them to cool down
(see §1.4 operation). If the operating time is too high, the motor temperature will raise and will
eventually activate the thermal protection. This event must remain exceptional and everything must
be carried out to avoid switching the thermal protection during normal operation phases.
Covers opening:
remove the covers only if there is no explosive atmosphere. It is important
not to degrade the explosion proof protections (surfaces, cable glands, gaskets, ...).
CAUTION:
« WARNING– DO NOT OPEN WHEN
AN EXPLOSIVE ATMOSPHERE
MAY BE PRESENT »
