Solenoid interlock 


Application:
AZM range solenoid interlocks, operating in combination with control elements of a machine, e.g. fail-safe standstill monitors or fail-safe delay timers, ensure that sliding, hinged and removable guarding devices, such as grids , hoods or doors, cannot be opened until hazardous conditions (e.g. running-down movements) have come to an end.

These solenoid interlocks are also used for cases in which the opening of a guarding device represents a non-permissible intrusion in a production process.

In combination with AES and AZR range safety monitoring modules (see chapter 10), the AZM range solenoid interlocks achieve Control Category 3 or 4 to EN 954-1, subject to suitable circuit arrangements. Examples of circuits for solenoid interlocks are shown in the Schmersal Control Circuit and Applications Handbook.

Design and mode of operation:
On the AZM range solenoid interlocks, the switching element with interlock is not physically connected to the actuator but functionally brought together or seperated on switching. When the guard device is opened in the uninterlocked condition, the actuator is seperated from the base unit. In the process, NC contacts are positively opened and NO contacts closed.

Interlocking is carried out by means of a blocking bolt / latching bolt. This latching bolt blocks the actuator so that it cannot be withdrawn from the interlock. The machine control circuit is only enabled when the actuator has been fed into the interlock and the latching bolt is in the blocking position. This is ensured by contact monitoring of the latching bolt.

There are two modes of interlocking. In the case of "Power to unlock", the latching bolt is held in the interlock by spring pressure. When the de-interlocking coil is energised, the interlock is removed and the NC contacts opened. The guarding device can be opened. For "Power to lock1)", the mode of operation is reversed.

The AZM 161, 170, 190 and 415 solenoid interlocks are fitted with protection against incorrect locking. Depending on the type of unit, an intergral failsafe standstill monitor, an intergral fail-safe delay timer and individual coding of the actuator are possible.

The solenoid interlocks can be fitted in any desired mounting position. Protection class of the solenoid interlocks is IP 54, IP 65 or IP 67.

1) In accordance with the policy of the German Technical Assessors, these interlock may only be used after a thorough evaluation of the accident risk, since the guarding device can immediately be opened on failure of the electrical power supply.

Ranges

AZM 161 - thermoplastic enclosure - holding force 2000 N

Thermoplastic enclosure
Manual / Emergency release
Long life
Double insulated 
High holding force 2000 N
30 N latching force
Screw terminals
Power to unlock or power to lock
3 cable entires
Actuating play 5.5 mm in direction of actuation

AZM 170 with connector

Thermoplastic enclosure
Compact design
Manual release from side
Long life
Double insulated
High holding force 1000 N
30 N latching force
Power to unlock or power to lock
A- and B-coding of the connectors




AZM 415 for double doors

Metal enclosure
Up to 3 switch inserts per enclosure
Robust design
Long life
High holding force 2500 N per door
Ball latch for each door, individually adjustable up to 500 N
Manual release available
Power to unlock or power to lock
2 cable entires
Spring-loaded actuators


AZM 415 - metal enclosure - holding force 3500 N

Metal enclosure
Two switches in one enclosure
Problem-free opening of stressed doors by means
of bell-crank system
Robust design
Long life
High holding force 3500 N
Adjustable ball latch to 500 N
Various manual and emergency releases available
Power to unlock or power to lock
2 cable entires
Left-hand version available
Spring-loaded actuators
EEx version available


AZM 415 with additional actuator

Metal enclosure
Two swithces with separate actuators
Suitable for Control Category 4
Problem-free opening of stressed doors by
means of bell-crank system
Robust design
Long life
High holding force 3500 N
Adjustable ball latch to 500 N
Power to unlock or power to lock
2 cable entires
The condition of the guard device can be scanned
Spring-loaded actuators
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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Schmersal Soleniod Locking Safety Switches