American Dryer Corp MLS-460 manual Temperature Sensing, Another Emergency Stop E-Stop Button

•“EMERGENCY STOP” (E-Stop) SWITCH --- PB6

If the “EMERGENCY STOP” (E-Stop) switch (pendant) does not respond:

c.PROBABLE CAUSES;

1)ANOTHER “EMERGENCY STOP” (E-Stop) BUTTON

2)A DISCONNECT PLUG

3)FAULTY SWITCH

4)WIRING BACK TO TB1

d.POSSIBLE SOLUTIONS;

1)Verify that ALL other “EMERGENCY STOP” (E-Stop) buttons are not pushed in, and retest.

2)Verify that ALL of the Pendant’s disconnect plugs are indeed connected. The disconnect plugs are for removal of the Pendant arm for shipping.

3)With the control voltage off, open pendant assembly and check switch using an OHM meter, replace if defective.

4)Locate terminals 14 and 15 on TB1 on the bottom of the electrical enclosure. Open their associated disconnects and place an OHM meter across these terminals. Push the “EMERGENCY STOP” (E-Stop) button in. Does the OHM meter respond?

•If “YES,” wiring from the pendant to TB1 is correct, check wiring on the main electrical panel, then retest.

•If “NO,” wiring from the TB1 is incorrect. Check wiring using the appropriate wiring diagrams listed above, and retest.

E.TEMPERATURE SENSING

INTRODUCTION

There is one (1) temperature sensing and controlling device in the MLS-460 located in the intake exhaust. The temperature sensing devices are RTD’s (Resistive Temperature Devices), whose resistance changes with temperature information from each RTD is forwarded to a respective 4 to 20 milliampere (4 to 20 mA) transmitter located on the Main Electrical Enclosure Panel. The converted signal is then connected to the PLC’s analog input module for further processing.

The following information will provide a means to respond to “Temperature Sensing” malfunctions, and verify ALL its electrical signals. Refer to the following diagrams placement and wiring information.

•MLS-460 ANNUNCIATOR, PENDANT, and UPPER RTD’S WIRING DIAGRAM

•MLS-460 MAIN PANEL WIRING DIAGRAM

•MLS-460 SYSTEM BLOCK DIAGRAM

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