The data and the products illustrated in this brochure may be modi ed without
notice. Under no circumstances can their description have a contractual value.
Page 5
The PLTA limit switch is an electromechanical device for low voltage control circuits (EN 60947-1, EN 60947-5-1) for use as
electric equipment on machines (EN 60204-1) in compliance with the essential requisites of the Low Voltage Directive 73/23/
EEC and the Machine Directive 89/392/EEC.
The limit switch is designed for use in industrial environments with even very severe climatic conditions (working temperatures
from -25°C to +70°C and is suitable for use in tropical environments). The equipment is not suitable for use in environments
with a potentially explosive atmosphere, in the presence of corrosive agents or high percentage of sodium chloride (saline mist).
Contact with oil, acids and solvents may damage the equipment. The limit switches is not suitable for use in environments
with a potentially explosive atmosphere.
The PLTA limit switch must be fastened through the holes on the side of the case (13); in particular the top holes are slots to
facilitate fastening and adjustment of the limit switch, which must be suitably position to ensure correct impact on the drive rods
(02). To prevent malfunctions or problems; examine the technical documentation to view the recommended impact points.
Turn the closing screws (24) and loosen the closure of the rod holder (01, 05, 23), then you can move the rods to adjust
them; afterwards, tighten the closing screws (24) with a force of 100cN m to ensure secure fastening of the rod holder. We
recommend adjusting the impact point of the rods (02) by adjusting the fastening of the entire limit switch and not simply
moving the rods.
The switches (19) of the PLTA are designed for the auxiliary control of contacts or electromagnetic charges in general (utilization
category AC-15 in accordance with EN 60947-5-1). The switches (19) have contacts with positive mechanical opening operation
(EN 60947-5-1). Do not connect more than one phase for the switches (19). Never oil or grease the switches (19).
To facilitate wiring the switches (19) the limit switches can be removed from the case (13); after wiring, the switches (19)
must be replaced correctly in the case (13), then assemble the cover (21) and tighten the screws (03) with a minimum force
of 100cN m.
Installation of the limit switches should be done by competent, trained personnel. The electric wiring must be done in a
workmanlike manner by quali ed personnel in compliance with the regulations in force.
Before performing installation and maintenance of the limit switches, disconnect the machine from the power mains.
Operations for installation and correct wiring of limit switch
- fasten the limit switch securely to prevent malfunctions during use of the device; to fasten it, use the holes on the
sides of the case (13); fasten the limit switch so that the drive rods (02) function correctly, by examining the technical
documentation to identify the recommended point of impact; adjust the (02), by turning the closing screws (24) on the
relative rod holder elements (01, 05, 23). Afterwards, tighten the screws (24) with a force of 100cN m
- introduce the multi-pole wire in the limit switch through the wire clamp (14)
strip the multi-pole cable for a length suf cient to wire it to the switches (19)
- wire the switches (19) as shown in the wiring diagrams on each (19); tighten the wires into the terminals of the switches
with a torque of 0.8 Nm (insertability of wires into the switch terminals equal to 2x1.5mm2 – 1x2.5 mm2)
- after wiring tighten the wire in the wire clamp (14)
- close the limit switch with its cover (21) with the closing screws (03); applying a force of at least 100cN m
Operations of routine maintenance
- check the correct tightening of the closing screws (03) on the cover (21)
- check the conditions of the wires on the switches (19) (if necessary, tighten the screws on the terminals)
- tighten the multi-pole wire in the wire clamp (14)
- check the conditions of the complete limit switch (01, 02, 05, 13, 21, 23)
- check the fastening of the limit switch
Any change to parts of the limit switch will invalidate the rating plate data and identi cation of the device, and render the
warranty null and void. In case of replacement of any part, use only original replacements.
MEYLE is not liable for damages caused by improper use of the device and installation which is not made correctly.
Use and Maintenance Instructions
Meyer Industrie-Electronic GmbH – MEYLE
Internet: www.meyle.de
Tel.: +49 54 81-93 85-0
Fax: +49 54 81-93 85-12
Carl-Bosch-Straße 8
49525 Lengerich/Germany
