UM/MC3

10

Safety Precautions

Before installing and using the Safety Mat System, carefully read the instruction manual attached to the product.

!WARNING

Serious injury may occur due to breakdown of safety

outputs. Do not connect loads beyond the rated value

to the safety outputs.

Serious injury may occur due to loss of required

safety functions. Do not use the Safety Mat with logics

that the operation of the mat might turn ON the

guarded equipment. Use the Safety Mat with logics by

which safety outputs turn OFF in a hazardous state.

Serious injury may occur due to loss of required

safety functions. Wire the Safety Mat properly so that

supply voltages or voltages for loads do NOT touch

the safety inputs accidentally or unintentionally.

Serious injury may occur due to loss of required

safety functions. Do not use a Safety Mat to detect

children as it does not support child detection.

To use a Safety Mat for the purpose of entry detection,

secure the following safety distance until a person

reaches a hazardous area by walking on the mat.

Otherwise, the machine may not stop before the

person reaches the hazardous area, causing injury.

Calculation of the Minimum Safety Distance

The EN999 standards provide the following formula to calculate the

minimum safety distance for floor-installed Safety Mats:

S = (1,600 x T) + 1,200 mm

In this equation, S is the minimum safety distance (unit: mm), the

term 1,600 represents a standard approach speed of 1,600 mm/s,

T is the overall stop time required for the machinery to stop, and the

term 1,200 mm represents the length of a step and the length of an

arm.

The overall stop time is comprised of two components:

T = t1 + t2

t1 : Maximum response time from the activation of the detection

device to the point that the control device's output goes OFF

(30 ms for these Safety Mats).

t2 : Response time of the machinery, i.e., the time required to stop

the machine or remove the risk after receiving the output

signal from the Safety Mat System.

The worst case scenario for the response time of the machinery

(t2) must be used in the formula. The actual response time

depends on various factors such as the machinery being used, the

operating mode, the product being processed, and the point in the

control cycle at which the stop signal is received. If there are other

factors that may affect the response time, such as brake wear,

these factors must be taken into account as well.

Example Calculation

In this example, the Safety Mats are used with machinery that has a

measured worst-case response time of 0.485 s.

T = t1 + t2

= 30 ms + 485 ms

= 515 ms = 0.515 s

S = (1,600 x 0.515) + 1,200 mm

= 824 + 1,200 mm = 2,024 mm

Consequently, the Safety Mat must be installed at a minimum

distance of 2,024 mm from the danger source.

Note: 1. Read the Instruction Sheet included with the Safety Mat

System thoroughly for details on designing and installing

the Safety Mat System to provide the minimum safety

distance mentioned above.

2. The Safety Mat's Ramp Trim and Molded Corner are not

considered part of the Safety Mat's detecting area. Do not

include the Ramp Trim and Molded Corner in the safety

distance.

• Turn OFF the power supply before wiring. Also, do not touch any

terminals (current-carrying parts) while the power is ON. Doing so

may result in electric shock.

• Do not perform wiring when there is a risk of lightning. Doing so

may result in electric shock.

• Apply properly specified voltages to the Safety Mat inputs.

Applying inappropriate voltages cause the Safety Mat to fail to

perform its specified function, which leads to the loss of safety

functions or damages to the Safety Mat.

• Use a power supply of the specified voltage. Do not use power

supplies with large ripples or power supplies that intermittently

generate incorrect voltages.

• Do not use the Safety Mat for a load that exceeds the Safety Mat's

switching capacity (contact voltage, contact current) or other

contact ratings. Doing so will reduce the specified performance,

causing insulation failure, contact welding, and contact failure, and

the Safety Mat may be damaged or burnt.

• The durability of the Safety Mat depends greatly on the switching

conditions. Confirm operation under the actual conditions in which

the Safety Mat will be used. Make sure the number of switching

operations is within the permissible range. If a Safety Mat is used

after performance has deteriorated, it may result in insulation

failure between circuits and burning of the Safety Mat itself.

• Do not use the Safety Mat where flammable gases or explosive

gases may be present. Doing so may cause combustion or

explosion due to Relay heating or arcing during switching.

• Do not drop or disassemble the Safety Mat. Doing so may reduce

the product characteristics and may result in damage, electric

shock, or burning.

• To prevent short-circuit or ground failure of the load, connect

protection elements such as fuses. Not doing so may damage or

burn the load.

• When installing trims, be careful not to get injured by the edge of

the trim, etc.

Precautions for Safe Use