Vanguard MCCB-250 User Manual download pdf (Page 11)

REV 2 MCCB-250 USER’S MANUAL

2.3 Timer Stop Input and Control

After a test is started, the MCCB-250 timer can be

stopped and the current source turned off using one of

three modes: dry contact input, wet contact input, or

interruption of the MCCB-250 current output. The

[LEFT ARROW] key is used to select the desired

mode.

When the DRY CONTACT mode is selected, the MCCB-

250 will output a DC voltage to the

[TIMER STOP]

terminals to sense the state of the dry contacts. A change in this dry contact state will stop the

timer and turn off the current source.

In WET CONTACT mode, the MCCB-250 will sense an AC or DC voltage applied to the [TIMER

STOP]

terminals. The OFF state is a voltage from 0 to 10 V ac/dc. The ON state is a voltage

from 24 to 300 V ac/dc. A change in the voltage state will stop the timer and turn off the

current source.

In CURRENT mode, an interruption of the MCCB-250 current source output (CB contact opened)

will stop the timer and turn off the current source.

Both the DRY CONTACT and WET CONTACT modes require an external input to the MCCB-250

via the [TIMER STOP] terminals.

NOTE

The MCCB defaults to DRY CONTACT mode when it is first turned on.

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Vanguard MCCB-250 User Manual Page 11