7
Corresponding variant is chosen according to the electric motor power:
contactors
BR2 550
output up to 550 W
BR 2,2
output up to 2,2 kW
SSR
BR2 BK 550
output up to 550 W
BR BK 2,2
output up to 2,2 kW
Switching of electric motor, contactor unit
The actuators in variants Control are fitted with built-in reversing contactor combinations or SSR switches. First
variant is assembled from two contactors and second variant from contactless switches.
The combination also includes mechanical blocking that prevents both contactors from being closed at the same time.
This could, for instance, happen in case of wrong connection of jumpers on the terminal board. The blocking is not
dimensioned for long-term action. The over-current relays protects the electric motor against over-loading and is
dimensioned with respect to its output. According to the actuator version, the contactors are controlled by the regulator,
change-over switch of local control or external input. Control voltage is 230 V / 50 Hz as a standard; it is supplied via
contacts of position and/or moment micro-switches. Thus, these micro-switches need not be led out of the actuator.
Contactors have defined service life at least 1 million cycles.
To extend the service life we recommend using contactless reversing unit with a minimum service life of 3 million
cycles. The standard control voltage is 24V DC. It is used for output into 4 kW or 7.5 kW. The unit consists of
semiconductor elements - thyristors.
6. ELECTRIC PARAMETERS
External electric connection
a) Actuator terminal board
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.
b) Connector
According to the customer's requirements the
MODACT MONED, MOPED, MONEDJ actuators can be
fitted with the connector to provide for connection of control circuits. This connector uses screw terminals allowing
conductors with a maximum cross-section 4 mm
2
to be connected. ZPA Pečky, a.s. also supplies a counterpart for
the cable. In order to connect the cable to this counterpart it is necessary to use special crimping pliers.
Actuator internal wiring
The internal wiring diagrams of the
MODACT MONED, MOPED, MONEDJ 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 M
Ω
.
After a dump test, isolation resistance of control circuits is min. 2 M
Ω
. Isolation resistance of the electric motor
is min. 1.9 M
Ω
. 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 = 1 x 230 V
1 500 V, 50 Hz
Un = 3 x 230/400 V
1 800 V, 50 Hz
