
Clearance at output part type no. 52 325, 52 326, 52 328 max. 1,5°
type no. 52 327, 52 329 max. 2,5°
Protection
The electric actuators are fitted with external and internal protecting terminal for securing protection against
dangerous shock voltage.
The protecting terminals are marked according to ČSN IEC 417 (34 5555).
The actuator must be properly secured against both overload and short circuit.
7. ELECTRONIC OUTFIT
Electro-mechanical control board is replaced with the electronic system DMS2 or DMS2 ED. Both systems scan
position of the output shaft and torque of the electric actuator by contact-free magnetic sensors. Long service life is
guaranteed for the contact-free sensors that do not get mechanically worn.
The sensor of the output shaft position is absolute and does not require any backup power supply in case supply
voltage is disconnected during operation of the electric actuator. Both systems can be set and monitored by a computer
with controlling program (set parameter can be backed up on a computer) or manually without a computer (for the
electronics DMS2, parameters can be manually set and it can be checked without computer only if the system is
equipped with a display and local control). They contain diagnostic functions - error messages on the display, memory
of recent failures and number of occurrences of respective failures.
The more simple system DMS2 ED substitutes the electro-mechanical board and/or provides for controlling
the electric actuator by input analog signal as in the version Control.
The system DMS2 enables the electric actuator to be used for two-position and three-position regulation or to be
connected to the industrial bus bar Profibus.
7.1 DMS2 ED
Basic outfit:
Control unit
main part of the system DMS2.ED - includes microcomputer, position sensor, 3 signal lamps LED,
4 push-buttons for simple setting and checking the actuator, connectors for connecting the torque
sensor, source board, and interface RS 232 (connection of computer for setting and diagnostics).
Torque unit
Source unit
electronic power supply, user's terminal board (connection of power supply and control signals), 2
torque relays, 2 position relays, 2 signalling relays, 1 relay for signalling errors (READY), switch of
resistance anti-condensation heater, connectors for connecting electronic brake, resistance heater
of analog module, and connector for interconnection with the control unit.
Optional outfit:
Analog module
output of feed-back signal 4 – 20 mA, in version CONTROL input of control signal 0/4 – 20 mA
Position indicator LED display
Local control
Contactors
Phase failure monitoring
module
This module is connected to all three power phases. If any outage occurs phase, the module
stops the actuator. Outwardly, this stop will appear as an impulse thermal protection.
Parameters:
Scanning of position contact-less, magnetic
Scanning of torque contact-less, magnetic
Working stroke see Tables 1, 2
Torque blocking 0 – 20 s at reversing in limit positions
Input signal 0(4) – 20 mA with switched on regulator function
Local/Remote control, Local open/close
Output signal 7 x relay 250 V AC, 3 A (MO, MZ, PO, PZ, SO, SZ, READY)
Position signal 4 – 20 mA max. 500 Ω, active/passive, galvanic-isolated,
LED display
Power supply of electronic 230 V AC, 50 Hz, 4 W, over-voltage category II
7