Servomech S.p.A.
02.20-25-28-30-40.E - Rev. 01 Date (M/Y) 05/19
16
If the push rod shifting directions are not compatible:
A) ACTUATOR WITH THREE-PHASE MOTOR: invert any wire pair (U1
V1, or U1
W1, or V1
W1) into the
terminal board;
B) ACTUATOR WITH SINGLE-PHASE MOTOR: change the contact (V1
W1);
C) ACTUATOR WITH DIRECT CURRENT MOTOR: invert contacts of the two motor supply cables.
In case of brake motor:
the brake is NORMALLY CLOSED (NEGATIVE action). When the power supply is switched off, the brake
is engaged. The brake opens only when power is supplied;
if the brake is wired directly to the connecting pins of the terminal box, it does not require any power
supply;
if the brake is wired separately, make sure that the correct voltage is used;
if the brake is equipped with hand release device, make sure that the brake is engaged before starting
the linear actuator.
6.8
Linear actuator installation
THE BALL SCREW LINEAR ACTUATOR (BSA SERIES) IS NOT SELF-LOCKING. BEFORE TO APPLY ANY
AXIAL LOAD ON THE PUSH ROD, LOCK THE INPUT SHAFT OR USE THE MOTOR BRAKE.
ALL MECHANICAL AND ELECTRICAL PROTECTION MUST BE INSTALLED AND ACTIVATED TO PREVENT
DAMAGE TO PERSONS OR PROPERTY.
•
Check that all plant fixing elements are well machined and cleaned, and that they fit the dimensions of
the actuators fixing elements they have to be fixed to.
•
If the length of the actuator have to be changed (push rod more retracted or extended) during
installation, power the motor with limited speed and torque values, in order to avoid possible damages
in case of a mechanical stop is reached.
•
In case of actuators without anti-rotation device (AR) and/or electrical limit switches device (FCE), it is
possible to manually screw/unscrew the push rod to change the length of the actuator.
•
In case of actuators with bellow protection (B): DO NOT TWIST THE BELLOW.
DO NOT SET THE LENGTH OF THE ACTUATOR OVER ITS EXTREME VALUES:
“Lc” = RETRACTED ACTUATOR
“La” = EXTENDED ACTUATOR
Figure 6.6 – “Lc” and “La” dimensions
Dimensions “Lc” and “La” are indicated in the technical catalogue of the product and on the check sheet
supplied with the actuator.