EElleeccttrriiccaal l ssyysstteemm 1100..1133
CChhaassssiiss AATTLLEET T SSEERRVVIICCE E MMAANNUUAALL
1010.3.3.4.4 CaCastster er whwheeeel l rorottatatioion ln locock, k, UFUFSS
The new caster weel rotation lock is valid from The new caster weel rotation lock is valid from version 5, 2002w33–version 5, 2002w33–
FunctionalityFunctionality
The castor wheel will be locked from rotation when the left foot switch is used forThe castor wheel will be locked from rotation when the left foot switch is used for
emergency braking, when panic braking with the brake pedal emergency braking, when panic braking with the brake pedal or if the emergencyor if the emergency
stop switch is used. The caster wheel rotation lock will stop switch is used. The caster wheel rotation lock will also be applied for differentalso be applied for different
kinds of errors that normally activate the electric brake on top of the traction motor.kinds of errors that normally activate the electric brake on top of the traction motor.
Service and fault findingService and fault finding
Current transducersCurrent transducers
To increase the safety, two To increase the safety, two current transducers are used for monitoring the currentcurrent transducers are used for monitoring the current
to the motor brake and the caster wheel rotation lock.to the motor brake and the caster wheel rotation lock.
If there is a loss of If there is a loss of current when it would be normal with a current when it would be normal with a current flow, or if therecurrent flow, or if there
is a short circuit iis a short circuit in any of the brake circuits, an error n any of the brake circuits, an error will be detected and stored inwill be detected and stored in
the error log.the error log.
If an error is If an error is detected and the truck is commanded to drive detected and the truck is commanded to drive in normal (fork/reversedin normal (fork/reversed
fork) direction, the truck will not fork) direction, the truck will not stop but the caster wheel lock will be applied. Ifstop but the caster wheel lock will be applied. If
an error is detected and the truck is commanded to drive in a an error is detected and the truck is commanded to drive in a sideway direction thesideway direction the
truck stops.truck stops.
If If the truck was stopped because of a momentary fault, reset is the truck was stopped because of a momentary fault, reset is done with OFF/ONdone with OFF/ON
from the keypad. If from the keypad. If the truck was stopped because a permanent fault, that it the truck was stopped because a permanent fault, that it can onlycan only
be moved again if the be moved again if the load wheel is turned to normal (fload wheel is turned to normal (fork/reversed fork) directionork/reversed fork) direction
and the caster and the caster wheel rotation lock is emergency hand released.wheel rotation lock is emergency hand released.
The ATC2 reading of the current transducers can be seen in the menu "HydraulicThe ATC2 reading of the current transducers can be seen in the menu "Hydraulic
inputs". When in Service menu, no current is flowing through the brake coils and ainputs". When in Service menu, no current is flowing through the brake coils and a
fixed value between 2,5V and 2,8V should be read for both transducers iffixed value between 2,5V and 2,8V should be read for both transducers if
everything is OK. The text string in the display shows "B2.5W2.5", where B =everything is OK. The text string in the display shows "B2.5W2.5", where B =
Traction motor brake and W = Wheel rotation lock.Traction motor brake and W = Wheel rotation lock.
If there is no If there is no connection to the ATC2 and the input is open, then approximately 4,8Vconnection to the ATC2 and the input is open, then approximately 4,8V
will be read. A will be read. A broken ground line will also give approximately 4,8V and a broken ground line will also give approximately 4,8V and a brokenbroken
+5V line around 1,5V. Values lower than 2V and higher than 4V are under no+5V line around 1,5V. Values lower than 2V and higher than 4V are under no
circumstances allowed and an error logging will circumstances allowed and an error logging will occur.occur.
Emergency hand release of caster wheel lockEmergency hand release of caster wheel lock
In the top of the wheel cover for In the top of the wheel cover for the caster wheel are there two holes with 30 the caster wheel are there two holes with 30 mmmm
diameter. Under the wheel cover is the brake for the castor wheel lock situated.diameter. Under the wheel cover is the brake for the castor wheel lock situated.
There are two M5 holes in the brThere are two M5 holes in the brake. If two M5x45 screws are screwed all the wayake. If two M5x45 screws are screwed all the way
down in those holes will the caster wheel lock will down in those holes will the caster wheel lock will be emergency hand releasebe emergency hand released.d.
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