8
5) ACTUATOR OUTFIT
Anti-condensation heater
The actuators are fitted with an anti-condensation heater preventing condensation of water vapour. It is connected
to the AC mains of voltage 230 V.
Local control
Local control serves for controlling the actuator from the site of its installation. It includes two change-over switches:
one with positions “Remote control - Off - Local control”, the other “Open - Stop - Close”.
The former change-over switch can be built-in as two-pole or four-pole. The change-over switches are installed in
a terminal-board box and the control elements on the lid of this terminal-board box.
6) ELECTRIC PARAMETERS
External electric connection
The electric actuator is equipped with a terminal board for connection to external circuits. This terminal board uses
screw terminals allowing conductors with a maximum cross-section 4 mm
2
to be connected. Access to the terminal
board is obtained after removal of the terminal box cover. All control circuits of the electric actuator are brought out to
the terminal board. The terminal box is fitted with cable bushings for connecting the electric actuator. The electric motor
is fitted with an independent box with a terminal board and a bushing.
Actuator internal wiring
The internal wiring diagrams of the
MODACT MOED EEx
actuators with terminal designation are shown
in this Mounting and operating instructions.
Each actuator is provided with its internal wiring diagram on the inner side of the terminal box. The terminals are
marked on a self-adhesive label attached to a carrying strip under the terminal block.
Isolation resistance
Isolation resistance of electric control circuits against the frame and against each other is min. 20 Mohm. After
a dump test, isolation resistance of control circuits is min. 2 Mohm. Isolation resistance of the electric motor is min.
1.9 Mohm. See Technical specifications for more details.
Electric strength of electric circuits isolation
Circuits of anti-condensation heater
1 500 V, 50 Hz
Electric motor
Un = 3 x 230/400 V
1 800 V, 50 Hz
Deviations of basic parameters
Tripping torque
±12 % of max. value of range
Adjusting speed
- 10 % of max. value of range
+15 % of rated value
(idle run)
Protection
The actuators are fitted with one internal and one external protective terminals ensuring protection against electric
shock according to ČSN 33 2000-4-41. One protective terminal is also fitted to the electric motor. The protective
terminals are labelled with a mark according to ČSN EN 60417-1a2
(013760).
7) DESCRIPTION
The electric actuators are designed for direct attachment on the controlled device.
(valve etc.).
The actua-
tors are connected by means of a fl ange and a clutch according to ČSN 18 6314. The actuator fl anges also
comply with ISO 5210. The following clutches are available for transmission of the output shaft motion to the
valve:
Summary of Contents for MODACT MO EE 52 120
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