ThyssenKrupp Access Citia BOS, Installation And Service Manual

 19 

Caution!

The control board is sensitive to static charge.  To avoid damage, 
touch a metal surface on the lift to discharge yourself of static 
charge.  Never touch the chips on the control board.

Always disconnect the 115 VAC power and disconnect 
the fuse when working on the lift.

First Power Up

To turn the controller board on after connecting the fuse, press 
the unit controls Up or Down pendant switch. The seat must be 
in the locked position and no obstructions can be in the way of 
the footrest.
Once the controller board has been turned on, it will stay on as 
long as the battery charger remains connected.

Remote Control (Transmitter) Frequencies

The standard wireless remote controls (transmitters) use infrared 
signals. One button on the transmitter is UP and other button 
is DOWN. There are two infrared sensors (receivers) located on 
the chassis access cover.  

A combination of 4 different transmitter frequencies allow for 
more than one lift in a single home.  The two transmitters must 
be set to the same frequency

(for each lift)

.  For example 1 to 

1, 2 to 2, etc.

To change a frequency:

Ensure the infrared receivers (in chassis cover) are connected 
to the control board.  Use the seat control to move the lift away 
from the end of the track.  Take the back off of the transmitters 
and set the red jumpers (in each transmitter) to the same code.  
Change the corresponding code in the control board J1 (see 
chart). Press and hold the yellow "learn" button on the control 
board, then press and hold one of the up/down buttons on one 
of the transmitters. 

The controller board should beep and the 

lift start to move after you release the transmitter button when 
the frequency has been successfully changed.

Note that if the lift is on an upper or lower limit switch, the fre-
quency may not be able to be changed.

To access the controller board the footrest support and shroud 
must be removed. The footrest plug can be temporarily jumpered 
out while changing frequencies.

D. 

CONTROL BOARD DIAGNOSTICS

C. 

CONTROL BOARD OPERATION NOTES

Quick Flash Red/Yellow - Short Circuit

Short circuit is an unrecoverable fault and may only be reset by 
disconnecting and reapplying the battery.  Short circuit may be 
caused by an excessive overload on the motor or failure of the 
MOSFET power devices.

Quick Flash Red - I

2

T

The motor has been overloaded for too long and the lift has timed 
out.  If the motor reaches 160% of full load for 6.0 seconds the 
unit will time-out.  To recover from this mode, the lift must be 
put into stop mode. The unit will sound 2 rapid beeps.

Steady Red - Current Limit

Motor is loaded more than 120% of its rating.  The motor will 
continue to run in current limit for a preset time, however, the 
speed will be reduced. The unit will sound 2 rapid beeps.

Note: Higher currents will allow for less run time.

Slow Flash Red - Emergency Stop

Either the fi nal limit switch has been tripped, the swivel seat 
switch is not in the operating position, or there is an obstruction 
in the footrest path.  If the fi nal limit switch has been reached the 
stair lift must be manually moved using an 8mm socket.

Quick Flash Yellow - Charging

Battery is charging. Charging begins approximately 2 minutes 
after lift reaches upper or lower limit.

Slow Flash Yellow - Under voltage

Battery voltage is below 11 VDC.

Steady Yellow - Caution Low Battery

Battery voltage is between 11 VDC and 21 VDC.

Slow Flash Green on GRN LED - Stop Mode

Battery voltage is above 21 VDC and the lift is stopped.

Steady Green on PWR LED - Run Mode

Battery voltage is above 21 VDC and the lift is running. A green 
test lead by the fuse allows the battery voltage to be measured 
without removal of the shroud

The control board contains LED's that indicate various functions 
or faults.  A slow fl ash is 1 second on and 1 second off, a quick 
fl ash is .25 seconds on and .25 seconds off.