Woodworking industry

Dynamic braking resistors for drive controls

Dynamic braking resistors increase the braking capability of a variable frequency drive. In many cases, feeding energy back into the grid is not economical. Instead, the extra energy is converted into heat using a chopper and a dynamic braking resistor. Frizlen steel grid resistors are very robust construction and therefore insensitive to vibrations. Protection degrees of Frizlen steel grid resistors variates from IP00 up to IP67.

Safety light curtains for wood processing applications

Reer’s safety light curtains can be used to prevent access to the danger area. Reer has the EOS and Vision family of safety light curtains for applications in category 2 /PL c and EOS, Admiral and Janus families for category 4 /PL e applications. The safety light curtains are avaible for finger, hand, body detection and access control. In addition to standard versions, heated water tight (IP 67), food industry (IP 69K) and ATEX versions of the safety light curtains are also avaible. Certificates: CE, TÜV, cULus, RoHS, S-Mark.

Safe sensorless standstill monitoring

The sensorless safety related standstill monitor LH 5946 of the SAFEMASTER S family recognizes direction-independent the standstill of motors without making use of additional external sensors like encoder or proximity switch. The Standstill Detection is directly achieved by monitoring the voltage at the motor connection terminals.

Particularly when it comes to access protection, where regular intervention during production process is necessary, the sensorless standstill monitor LH 5946 can make use of its strengths. When there is no dangerous movement from the motor anymore the safety gate can be released within a very short time at detected standstill. Due to a variable adjustment of the response value and reaction time on the device, an individual adaption is possible.

Safe guard locking with guard lock monitoring for maintenance doors and hatches

CTP is simple PL e-level safety switch. Vibration resistance and degree of protection up to IP 69K make the CTP suited for challenging environmental conditions. The safety switch is easy to connect to the safety relay or -logic via OSSD outputs. The comprehensive range of bolt systems offers maximum flexibility during integration and mounting.

Reliable safe position detection for maintenance doors and hatches

CES is PL e-safety level non-contact safety switch. It is RFID coded and it can be used for monitoring sawline gates and doors. With wide range of operating temperature (-40 … +65 °C) CES-C02 is suitable solution for challenging outdoor applications due to its frost resistance.

Special version of Admiral Long Range – decreased sensitivity to small objects

Dual Beam -safety light curtains for access control are shielded with double beam. Each beam consists of two parallel beams which both have to be interrupted in order to activate the safety function. Due to the dual beam system the light curtain is not interrupted by small objects, birds or sawdust. The maximum operating range is up to 80 m, which makes it suitable for the use in saw mills and other wood working applications. For the outdoor use the curtain is available with heated IP 67 WTH case.

Starting dangerous machine movements is not possible when CKS key is withdrawn

With one CES read head and RFID coded key, it is possible to make electronic safety lock for maintenance. The safe key detection can prevent the starting of hazardous movements if the key is not inserted. This safety component allows dangerous machine movements to be undertaken as long as a valid key is inserted. A stop command is triggered if the key is removed during the dangerous machine function. In addition to use as a lockout bar, the CKS system is ideally suited as an electronic key transfer system or for assigning access rights to stop a production process.

Multifunctional safe guard locking with guard lock monitoring and controls for maintenance doors

Optional buttons and indicators can be integrated directly into the MGB. Handle module and the optional escape release enable effortless use of the safety lock. Vibration resistance and degree of protection up to IP 65 make the switch suitable for sawmill industry.

Modular and flexible safety switch for maintenance doors

MGB2 is flexible PL e-safety level interlocking or guard locking system for the protection of sawline safety doors. MGB2 Modular offers space for two submodules, each with up to three different controls. Handle module and the optional escape release enable effortless use of the safety lock. MGB2 Modular can be fitted to doors hinged on the right and left, as well as to sliding doors. Vibration resistance and degree of protection up to IP 65 make the switch suitable for sawmill industry.

Monitoring of insulation resistance of ungrounded voltage systems to earth

In the sawmill industry there is a lot of flammable material or explosive dust in the operating environment, continuous monitoring of the insulation level of the electrical networks is critical.

Insulation monitor offers a convincing solution for insulation monitoring of non-earthed power supplies. It can avoid the risk of fire and accidents due to slowly evolving insulation faults. Faults are detected even during operation and costly plant standstills are prevented. Two limits can be set for the insulation monitor; alarm and shut down.

Detection of insulation faults in grounded voltage systems

Detection of insulation faults in grounded voltage systems. The residual current relay is used to maintain electrical plants before faults occur. Decrease in insulation can be detected and indicated early without interruption of operation.

Soft start, soft stop, reversing and protecting of 3 phase asynchronous motors.

The smart motor starter UG 9410 can be used for soft start, soft stop, reversing and protecting 3 phase asynchronous motors. By measuring the line current a thermal model is used to calculate the motor temperature, and in the case of overtemperature the motor is disconnected. In addition also a thermo switch can be used. The reversing is done via relays. The relays are switched without current flow, this provides long service life.

For safe control and monitoring of motor movements

Devices used in the sawmill industry are often dangerous to users, so stopping their movements in a controlled and fast manner is a priority for safety. Dold motor brake relays provide the stopping times required by safety standards for dangerous movements such as a saw blade. There are several models available, depending on the size of motor. The current value required for the DC brake is roughly twice the motors rated current. Too high braking current only heats the motor unnecessarily, which can lead to dangerous situations. Thanks to semiconductor technology, the components are durable and do not require separate maintenance.

Motor soft start without mechanical wear

Soft starters allow the starting current to be steplessly limited and increased during start-up. In this case, a steady increase in the speed is achieved, which is important, for example, in belt conveyors. The softstarter can replace traditional star-delta starters that use traditional contactors. Because the soft starters are based on semiconductor technology, they do not contain wear parts in the same way as traditional contactors. This extends the life and safety of the starter devices. Frequency converters are also used to control the speed of the motors. Considering the motor size and installation, there are applications where the use of the soft starter is more cost-effective and easier to implement. In the soft starter, adjustments are made on the front panel pots and no programming skills are required.

Safe sensorless standstill monitoring

The sensorless safety related standstill monitor LH 5946 of the SAFEMASTER S family recognizes direction-independent the standstill of motors without making use of additional external sensors like encoder or proximity switch. The Standstill Detection is directly achieved by monitoring the voltage at the motor connection terminals.

Particularly when it comes to access protection, where regular intervention during production process is necessary, the sensorless standstill monitor LH 5946 can make use of its strengths. When there is no dangerous movement from the motor anymore the safety gate can be released within a very short time at detected standstill. Due to a variable adjustment of the response value and reaction time on the device, an individual adaption is possible.