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NOTE: The minimum amount of time for the Module to detect a STOP condition is 15 milliseconds. This

"recovery time" (OFF state) is required for the internal integrity tests to complete, allowing a reliable

reset to occur. A lockout may occur if the Module is cycled too quickly. To clear the lockout, the inputs

must be re-cycled, meeting the minimum recovery time requirements.

Safety Mat Device Checkout - Prior to Module Connection

Before connecting the safety mat to the Module, verify the installation does not exceed the maximum resistance

specification. Check the mat with an ohmmeter to verify that none of the following values are exceeded.
1. Check the leadwire resistance.

a) Keeping track of which wire goes to which terminal, disconnect all 4 wires from the terminal blocks.
b) Measure and record the resistance between the wires going to terminals S11 and S12: ________ (=Ra)
c) Measure and record the resistance between the wires going to terminals S21 and S22: ________ (=Rb)
d) Review the values for Ra and Rb.

If both Ra and Rb

are

Then

Less than 50 ohms

The lead resistance is acceptable for all supply voltages; check the mat resistance next. If it

is 50 ohms or more for either, continue below.

Less than 500 ohms The lead resistance is acceptable for an AC supply and for a DC supply >20 V. If resistance is

acceptable for your supply, check the mat resistance next. If resistance is not acceptable,

lower the lead resistance by shortening the leadwires or by increasing the wire diameter.

Recheck Ra and Rb.

2. Check the mat resistance.

a) Step on the mat in various locations while taking the measurements listed below.
b) Measure and record the highest observed resistance between S11 and S21: ________ (=Rc)
c) Measure and record the highest observed resistance between S21 and S22: ________ (=Rd)
d) Review the values for Rc and Rd.

If both Rc and Rd are

Then

Less than 10 ohms

The mat and leadwire resistance is acceptable for all supply

voltages and the safety mat checkout is complete.

Less than 150 ohms AND you are using an

AC supply or DC supply greater than 20 V dc

The mat and leadwire resistance is acceptable and the safety mat

checkout is complete.

Any other value

If resistance is not acceptable, proceed to the next step.

3. Connect the ohmmeter to the wires to be connected to S11-S12 (Channel A), and note the resistance.
4. Connect the ohmmeter to the wires to be connected to S21-S22 (Channel B), and note the resistance.
5. Perform the following calculation: Rm = (Rc + Rd - Ra - Rb)/2.

If Rm is:

Then

Less than 10 ohms

The mat resistance is acceptable for all supply voltages; the safety mat

checkout is complete.

Less than 150 ohms AND you are using

an AC supply or DC supply greater than

20 V dc

The mat resistance is acceptable and the safety mat checkout is

complete.

Any other value

The resistance in the mat is too high for safe operation. Replace the

safety mat. Repeat the mat resistance checkout for the new mat.

WARNING: Safety Mat Resistance Values

Exceeding the maximum resistance between the monitoring channels (usually due to

degradation of the mat) can result in the increase of response time or complete loss of the

sensing function of the safety mat, when it is stepped on (shorted). This can result in serious

injury or death.

Exceeding the maximum resistance within a contact monitoring channel can result in the Module issuing

a stop command (opening the safety outputs) when no person is present.

To ensure proper operation, verify the quality and specifications of the mat being connected

to this Module, and perform periodic checks of the safety mat's resistance, as described in

the Safety Mat Initial Checkout.

MAX1524 and MAX2324 Safety Mat Monitoring Modules

P/N 122366 Rev. B

www.LARCO.com   TEL: 800-523-6996

7

Содержание 23365300

Страница 1: ...ge Outputs Output Rating MAX1524 12 to 24 V dc or 115 V ac 4 Normally Open Safety 1 Normally Closed Aux 2 Solid State Aux N O Safety Outputs 6 A N C Aux Outputs 5 A SS Aux Outputs 100 mA MAX2324 12 to 24 V dc or 230 V ac Important Read This Before Proceeding The user is responsible for satisfying all local state and national laws rules codes and regulations relating to the use of this product and ...

Страница 2: ... LED turns OFF and the Module can be reset if configured for Auto Reset the safety outputs will turn ON immediately The output relays energize automatically if the Module is wired for Auto Reset mode all sensors are clear all faults are removed or corrected and power is applied The Module requires a manual reset if it is wired for Manual Reset mode Application of Pressure Sensitive Mats and Floors...

Страница 3: ...usion The rationale assumes that the possibility of certain well defined failure s can be reduced via design installation or technical improbability to a point where the resulting fault s can be for the most part disregarded that is excluded in the evaluation Fault exclusion is a tool a designer can use during the development of the safety related part of the control system and the risk assessment...

Страница 4: ...tely repair or replace any damage for example cuts tears wear or punctures to the outer insulating jacket of the interconnect cable in the presence of fluids or to any part of the exterior of the sensor Ingress of material including dirt particles insects fluid moisture or turning chips which may be present near the mat can cause the sensor to corrode or to lose its sensitivity Routinely inspect a...

Страница 5: ...OSHA recommended hand speed constant K has been determined by various studies and although these studies indicate speeds of 1600 mm 63 in per second to more than 2540 mm 100 in per second they are not conclusive determinations The employer should consider all factors including the physical ability of the operator when determining the value of K to be used If an individual can cross completely over...

Страница 6: ...model MAX2324 at 7 VA The sensor circuit which monitors the conductive elements plates of the safety mat consists of two channels A and B that issue a stop command that is open the safety outputs when an individual steps onto the safety mat shorting the two channels together It is not possible to give exact wiring instructions for a Safety Module that interfaces to a multitude of machine control c...

Страница 7: ...tween S21 and S22 ________ Rd d Review the values for Rc and Rd If both Rc and Rd are Then Less than 10 ohms The mat and leadwire resistance is acceptable for all supply voltages and the safety mat checkout is complete Less than 150 ohms AND you are using an AC supply or DC supply greater than 20 V dc The mat and leadwire resistance is acceptable and the safety mat checkout is complete Any other v...

Страница 8: ...rea of dangerous motion may be observed by the switch operator during the reset procedure See Warning WARNING Reset Routine Required U S and international standards require that a reset routine be performed after clearing the cause of a stop condition for example arming an E stop button closing an interlocked guard etc Allowing the machine to restart without actuating the normal start command devi...

Страница 9: ... 24 115V MAX2324 for 12 24 230V B1 S11 S12 S22 S21 S34 S33 S32 S35 13 14 23 24 33 34 43 44 51 52 Y31 Y32 Y35 Y30 A2 S32 S31 A1 L1 Machine Control Circuits dc common V dc common V MSC Monitor Contacts or Jumper Mat 5A max K1E K2E S11 S12 S22 S21 Mat n Mat 1 Series Connection of Multiple Safety Mats The number of mats is limited by the total series resistance per input channel See section Safety Mat...

Страница 10: ...ation in order to isolate both the Safety Module and the user from the higher voltage levels of a Category III environment For Overvoltage Category III installations with applied voltages from 151 V to 250 V ac dc applied to the output contact s the Safety Module may be used under the conditions of a higher overvoltage category where appropriate overvoltage reduction is provided Appropriate method...

Страница 11: ...ower to the machine control elements and perform the following Periodic Checkout Procedure Safety Mat System Periodic Checkout Procedure Verify the functioning of the safety mat monitoring system periodically to ensure proper operation see also the machine manufacturer s recommendations WARNING Checkouts for Multiple Safety Devices If more than one safety mat is series connected to one Safety Mat ...

Страница 12: ...ON Repairs Contact ATEK Access Technologies for troubleshooting of this device Do not attempt any repairs to this device it contains no field replaceable parts or components If the device device part or device component is determined to be defective by Customer Care Team they will advise you of the RMA Return Merchandise Authorization procedure Important If instructed to return the device pack it ...

Страница 13: ...mum and maximum values of the contact s changes to Minimum Maximum Voltage 15 V ac dc N O Safety Contacts 13 14 23 24 33 34 43 44 250 V ac 24 V dc 6 A resistive B300 Q300 UL508 Current 250 mA ac dc N C Auxiliary Contact 51 52 250 V ac 24 V dc 5A resistive B300 Q300 UL508 Power 5 W 5 VA Minimum Maximum IEC60947 5 1 Voltage 15 V ac dc N O Safety Contacts AC 1 250 V ac 6 A DC 1 24 V dc 6 A AC 15 230 ...

Страница 14: ...tor indicates a fault condition see Troubleshooting Construction Polycarbonate housing Rated NEMA 1 IEC IP20 Mounting Mounts to standard 35 mm DIN rail track Safety Module must be installed inside an enclosure rated NEMA 3 IEC IP54 or better Vibration Resistance 10 to 60 Hz at 0 35 mm peak displacement per UL 991 60 to 150 Hz at 5 g max Operating Conditions Temperature 0 C to 50 C 32 F to 122 F su...

Страница 15: ...tly in Seller s quotation Goods are warranted for twelve 12 months from the date of shipment by Seller Products purchased by Seller from a third party for resale to Buyer Resale Products shall carry only the warranty extended by the original manufacturer Buyer agrees that Seller has no liability for Resale Products beyond making a reasonable commercial effort to arrange for procurement and shippin...

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