3
General description, function
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3
General description, function
3.1
Description
The SLE22 is an electronic control device for hoists. The device can be used to control
pole-changing or frequency-controlled drives. It comprises a safety-oriented overload cut-
off for hoists in conjunction with a load sensor (see point 3.2.) It is a configurable system
that performs the safety function only after parameterizing and saving the safety-relevant
parameter overload cut-off point, reliably disconnecting the hoist motion.
In addition the device performs other control functions which are not safety-relevant
•
Mechanical operating hours counter
•
Temperature control for hoist and travel motors
•
Display of system status via signal relay
•
Control of hoist motions by motor management
3.2
Load sensor
NOTICE
The SLE22 processes load sensor currents from 0 - 25.5 mA. Two independent load
sensors or a dual-channel sensor are to be connected.
The load sensor is an integral part of the prototype test of the device and is thus a safety-
relevant component. For this reason only load sensors approved by the manufacturer
must be used. If a load sensor is defective, the same type must always be ordered and
installed. The load sensors are specified by the manufacturer corresponding to the
individual hoist and load and assigned in-house. During replacement, note Chapter 4.4,
Replacement of devices and sensors.
Warranty and approval of the device expire if an unapproved sensor is installed!
WARNING
If a load sensor with two internally independent channels is used, it must be of two-
channel design. A single fault must not cause both sensor cells to fail. See Technical data
for further requirements.
3.3
Frontal view
Hex switch: LEDs
S1:
Motor management selector switch
S4:
Rough adjustment of cut-off point
S2:
Fine adjustment of cut-off point
S3
: DIP switch for activating test rig, operating
relays and motor management functions
S5:
Enter switch: e.g. crane test
View without lid
DANGER
Alterations to the setting of the stored cut-off point may only be performed by a
qualified person!
Unauthorised alterations cause the warranty to expire!
DIP switch