Koso REXA Electraulic Xpac, Installation And Operation Manual

Page: 46 / 164

Xpac
Installation Manual -- Version 5.1 (5/08)
38
REXA
Electraulic Actuators & Drives
7 START-UP CONSIDERATIONS
7.1 Wiring
The majority of problems encountered during initial start-up of REXA
actuators involve wiring or electrical power. Although the wiring is
simple and straight forward, the quantity of wires and color coding
require reasonable care when making the connections. Any miswiring
will keep the unit out of service or cause serious damage.
7.1.1 Module Cable
(B or C)
or Motor Cable
(½D or D)
If motor phase wires are crossed or they are intermittent (loose con-
nection), an E-dr Error will occur.
1. Verify that wiring is correct using section 5.1.
2. Visually inspect both ends of the cable for cut wires, short circuits,
or loose connections.
3. Make sure clamped connections are made to the bare wire and
not the insulation.
4. Using a digital multimeter, check the continuity of the motor phase
wires from the connector to the stepper motor driver circuit board.
Should any of these connections be open or intermittent, the cable
connecting the driver to the mother board is seated improperly.
7.1.2 Feedback Cable
Mis-wiring of the feedback cable will cause the position display to
remain constant during actuator motion or an E-Fb error to occur.
1. Verify that wiring is correct and secure using section 5.2.
2. Insure the feedback power (+15 VDC) is present at the feedback
circuit board by the illuminated LED.
3. Make sure clamped connections are made to the bare wire and
not the insulation.
4. Place an ammeter in series with the feedback wires. If the signal
changes while moving the actuator, then the feedback is working
properly.
7.1.3 Electrical Power
Failure to maintain specified voltages at the actuator may cause unit
stall or complete shutdown. Keep in mind demands on your power
buss. Are there intermittent power drains which will pull down the
line? Have power cables been properly sized for the current and
length of run? Review Section 5.3.1 for power requirements on the
B, C and 2C Power Modules and Appendix X for power requirements
on the D and 2D Power Modules.
!IMPORTANT!
During assembly, Loctite 767 com-
pound—or its equivalent—must be
used on threads of all NPT plug
and conduit connections to ensure
a watertight seal.
*Note:
Refer to page 47 for
Addendum: Cylinder End Stops
.