Arjohuntleigh Maxi Sky 2, Maintenance And Repair Manual

Page: 127 / 140

8 - 14
PM
code Description
What to do/What to check
L
Up/Down motor does not
rotate or the encoder does not
read the motor speed.
Associated to Malfunction
1: Up/Down motor encoder
fault
1. Check if the encoder J11 is connected.
2. Check if the encoder wire and the contact are correct at J11.
3. Press Up or Down and check if the strap moves and if a malfunction is
displayed.
4. Connect an external Up/Down motor (don’t forget to connect the encoder) and
test if the Up and the Down action work. If it works with the external motor,
replace the motor; refer to “REMOVING THE UP/DOWN MOTOR”, page
6-52 and “INSTALLING THE UP/DOWN MOTOR”, page 6-54.
M
Up/Down Motor is not
functional.
Associated to:
Malfunction 3: Up/Down
motor drive fault (Malfunction
from the motor driver caused
by a short circuit of the motor
or the driver is not powered)
Malfunction 4: Holding
system not functional (wiring
of the motor is broken)
Malfunction 5: Motor Up/
Down wiring fault (The wiring
path of the Up/Down motor is
opened)
Malfunction 7: Overcurrent
on Up action
Malfunction 8: Overcurrent
on Down action
1. If malfunction 8 is displayed, verify that the Up/Down action are not inverted.
If so, check limit kit (lower limit). If not, continue the following troubleshooting.
2. Try to reproduce the malfunction with the Up/Down motor.
3. Check if the 15A motor fuse is blown up (near the emergency stop). Replace
it and test again.
4. Power off the MS-2. Disconnect the power connector J1. Check the conductivity
of the Up/Down motor (Blue wire pin 11 and Red wire pin 12). If the Up/Down
motor is short (lower than 2 ohms) or open, replace it and test again.
5. Connect an external Up/Down motor (don’t forget to connect the encoder)
and test if the Up and the Down action work. If it works with the external
motor, replace the motor; refer to section “REMOVING THE UP/DOWN
MOTOR”, page 6-52 and “INSTALLING THE UP/DOWN MOTOR”,
page 6-54.
6. If the malfunction appears again, replace the main board; refer to section
“REMOVING THE MAIN BOARD”, page 6-33 and “INSTALLING THE
MAIN BOARD”, page 6-35.
7. When problem is solved, reset the preventive maintenance.
WHEN THE UP/DOWN MOTOR IS REPLACED, DON’T FOR-
GET TO INSTALL THE MOTOR MAGNET IN THE SAME POSITION.
A 180 DEGREES TURN OF THE MAGNET WILL CAUSE THE
MOTOR TO TURN IN THE WRONG WAY
NOTE
N
Left/Right Motor is not
functional.
Associated to Malfunction
9: Overcurrent on Left/Right
action
1. Try to reproduce the malfunction with the Left/Right motor.
2. Check if the 15A motor fuse is blown (near the emergency stop). Replace it and test
again.
3. Power off the MS-2. Disconnect the power connector J1. Check the conductivity of
the Left/Right motor (Blue wire pin 3 and the Red wire pin 6). If the Left/Right motor
is short (lower than 2 ohms), replace it and test again; refer to section “REMOVING
THE LEFT/RIGHT MOTOR”, page 6-41 and “INSTALLING THE LEFT/RIGHT
MOTOR”, page 6-42.
4. Connect an external Left/Right motor and test if the Left and the Right actions work. If
the external motor works, replace the motor.
5. If the malfunction appears again, replace the main board; refer to section “REMOVING
THE MAIN BOARD”, page 6-33 and “INSTALLING THE MAIN BOARD”, page
6-35.
6. When problem is solved, reset the preventive maintenance.
O
Sit/Reclined Motor is not
functional.
Associated to Malfunction
10: Overcurrent on Sit/
Reclined action
1. Try to reproduce the malfunction with the Sit/Reclined motor.
2. Check if the 15A motor fuse is blown (near the emergency stop). Replace it
and test again.
3. Power off the MS-2. Disconnect the power connector J1. Check the conductivity
of the Sit/Reclined motor (Black wire pin 4 and the Red wire pin 7). If the Sit/
Reclined motor is short, replace it and test again.
4. Connect another PDPS and test if the Sit/Reclined actions work. If it‘s not
working, replace the PDPS.
5. If the malfunction appears again, replace the main board.
6. When problem is solved, reset the preventive maintenance.
001-15697 rev
. 5