9
Fig. 7
Electronic load limiting device
START
0
0,5 s
TIH4X-G
A1 11 K
I
1
I
2
(N) (L) (L)
10A 5A
U
12 14 Y1 Y2 A2
12 14
11
10 % 100
40
60
80
START
Hysterese (= I
S
x 0,5)
U
Y1 Y2
I
S
R
5A 250V~ 1000VA
A1 A2 K
I
1
I
2 Y1 Y2 12 11 14
~
5 A
10 A
I
N
= 5 A, 10 A ~
GREIFZUG
U
I
N
Speicher
R
3.8
Safety devices
3.8.1Primary brake
Electromagnetic brake wich closes automatically
–
if the UP/DOWN-button is released
–
in case of power supply failure.
3.8.2 Emergency Stop
Pushing the red EMERGENCY STOP button in case
of emergency completely switches off the hoist con-
trol. To start after clearing the problem, turn the
EMERGENCY-STOP button clockwise until it re-
leases.
3.8.3 Phase control relay
On hoists with 3-phase motors, the integrated phase
control relay stops the operation, if the phases are
reversed. This prevents wrong coordination of the
UP/DOWN-buttons, which would prevent operation of
the load limiting device as well as the upper limit
switch.
Correction: turn the phase inverter of the plug by
180
(Fig. 6).
Fig. 6
Control for
1
2
Speed
Speed
UP
DOWN
EMERGENCY
STOP
Fig. 5
Reducing the switch-off threshold value
Setting to a lower threshold value e.g. as a result of a
lower carrying capacity of the suspended access
equipment, can only be carried out by a qualified
electrician or a hoist workshop (fig. 7):
A Pre-setting
A.1 Nominal curent
Turn upper regulator to the right as far as the
stop.
A.2 Start-bridging
Turn lower regulator to the right as far as the
stop.
3.8.4 Load limiting device
3.8.4.1 Electronic load limiting device
The load limiting device is set by the manufacturer in
such a manner that it switches off the lifting move-
ment at the latest when the load has reached 1.25
times the rated capacity of the hoist. A warning signal
(lamp or buzzer) must be provided for on the control
box which notifies the operator of the overload.
Possible causes for switching off:
–
overloading of the suspended access equipment,
possibly as a result of unfavourable load distribu-
tion,
or
–
the suspended access equipment being blocked
by an obstacle during upward travel.
Action following switching off:
Press DOWN button,
–
until the suspended access equipment is once
again on the ground and reduce the load to such
an extent that, or redistribute it until there is no
longer any overload
or
–
until the suspended access equipment is free
from the obstacle which must be removed before
travel is continued.
Function of the load limiting device
The electronic load limiting device reacts to the cur-
rent consumption of the motor. The overload is
detected during lifting.
B. Setting
(Example for Tirak X 500 P)
B.1 Setting the overload
Attach overload = rated load + 25 %
(e. g. 625 kg)
During the lifting of the overload turn the upper
regulator to the left until the hoist stops.
Lower overload until the rope is slack.
Again lift overload – the hoist must stop as soon
as it comes under load.
Phase inverter
in CE-plug
