Koso REXA Electraulic Xpac, Installation And Operation Manual

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REXA
Electraulic Actuators & Drives
Xpac
Installation Manual -- Version 5.1 (5/08)
45
8 ERROR CODES
The PCP is able to provide various diagnostics for actuator malfunc-
tion. These ERROR CODES are two letters preceded by an E- on
the five digit display. Except for loss of feedback, E-Fb, the display
will alternate between the error codes and actual position. Anytime
an error is active, the alarm relay (Appendix C.4) will change state.
Please refer to the Trouble Shooting and Repair manual for correc-
tive action.
8.1 Loss of Feedback, E-Fb
The feedback circuit transmits the position of the actuator to the PCP.
This signal should be between 4 mA and 20 mA and will change
with actuator position. A signal below 4 mA will be interpreted as
a feedback problem. Motion of the unit will cease, the alarm relay
will trip and E-Fb will appear on the display.
Potential reasons for the error include: Loose wiring, triple power
supply, feedback board, PCP I/O.
8.2 Stall, E-St
If the actuator stops before reaching the target position, a stall condi-
tion, E-St, is indicated. Automatic corrective action consisting of five
motor restarts will occur. Continued failure to resume motion will
stop the unit, trip the alarm relay and alternate the display between
E-St and actual position. Actuator stall may be cleared by "Stall
Recovery"; that is, changing the incoming control signal to indicate
a position opposite the direction of the stall point.
Potential reasons for the error include: incorrect calibration, mechani-
cal restriction, insufficient output, heater.
8.3 No Control Signal, E-CS
If Fail Safe is active, [CtL:FS] = IP, PL or PH, and the control signal
falls below 2.5 mA, a control signal failure, E-CS, will be indicated.
The actuator will move to its programmed fail-safe position, the
alarm relay will trip and the display will alternate between E-CS and
actual position.
Potential reasons for the error include: loose wiring, loss of control
signal, triple power supply, PCP I/O.
E-Fb will automatically clear when
the feedback signal is within normal
range.
E-St will clear by "Stall Recovery",
cycling electric power, pressing the
PCP reset button (located in the upper
left corner) or entering the LOCAL or
SETUP modes.
E-CS will automatically clear when
the control signal is within normal
range.