REV 2
MCCB-250 USER’S MANUAL
8
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
[
]
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.
