Model 3380-C

Model 3380-C Two-Hand Machine Control Anti-Tiedown Monitor

Nolatron’s anti-tiedown controls are used in conjunction with two start switches to help protect machinery operators. The 3380 series helps to comply with OSHA, which requires a machine operator to have both hands on the start switches in order to start a machine cycle. This minimizes the possibility of the operator starting the machine while one hand is in the work area.

Both start switches must be activated within a fixed time interval to energize the output. This prevents an operator from “tying down” one of the switches while continuing to operate the machine.

The 3380 uses redundant positive guided output contacts which are cross-checked before every machine cycle. A single component failure will cause the control to shut down in a safe mode.

Features:

Double force guided output relays – Each relay is checked for proper status prior to beginning a machine cycle.

Pin for pin compatability with Model 3370 – Model 3380-C can be used to replace the 3370 control with no modification to wiring. This allows easy upgrading of existing machinery.

Control reliable – Model 3380-C is designed to meet the OSHA classification of “control reliability” as defined in section 1910.217(13).

NORMALLY CLOSED CONTACT – When both start switches are pressed within .5 seconds, the pin 5 contacts close and the pin 4 normally closed contact opens. When one or both switches are released or the reset switch is opened, the pin 5 contacts open and the pin 4 contact closes. The Hold switch shown above can also be used in conjunction with the normally closed contact. Note: The normally closed contact on pin 4 is not monitored, and should not be used to drive a load that needs “control reliable” protection.

Operation:

MOMENTARY OUTPUT: In order for a machine cycle to begin, both start switches must be pressed within .5 sec. (this time is internally adjustable). The output will remain energized as long as the start switches are depressed.  The optional Reset switch can be opened to end the machine cycle regardless of whether the start switches are depressed. In some applications the Reset switch is used as a means to provide a “single stroke” of the machine. Both start switches must be released before another machine cycle can be started. If either start switch is “tied down”, the cycle cannot be repeated.

MAINTAINED OUTPUT: In order for a machine cycle to begin, both start switches must be pressed within .5 sec. (this time is internally adjustable). The output will remain energized as long as the start switches are depressed.  Closing the optional Hold switch will allow the load to remain energized after the start switches are released. The Hold switch must not be closed until the pinch point is passed. The Hold switch should stay closed for the rest of the machine cycle. The Reset switch can be opened to end the machine cycle regardless of whether the Hold switch is closed or the start switches are depressed. Both start switches must be released before another machine cycle can be started. If either start switch is “tied down”, the cycle cannot be repeated.

Specifications:

Nolatron 3380 Brochure

Nolatron 3380-C Application Notes