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Vanguard MCCB-250 User Manual

Page 8

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MCCB-250 USER’S MANUAL

REV 2

5

Table 2. Functional Descriptions of MCCB-250 Controls and Indicators

Item

Number

Panel Markings

Functional Description

1

COM

Current source common terminal.

2

250A

250A current source terminal.

3

120A

120A current source terminal.

4

25A

25A current source terminal.

5

5A

5A current source terminal

6

RS-232C

RS-232C (serial) interface port for factory firmware programming and
diagnostics.

7

90-120 Vac

50-60 Hz, 20A

or

200-240 Vac

50-60 Hz, 20A

Input power connector.

8

None Circuit

Breaker/Power

Switch.

9

GROUND

MCCB-250 ground stud. Connect ground stud to substation ground using
provided cable.

10

CURRENT
CONTROL

Current control knob.

11

HIGH

CURRENT

PRESENT

High current presence indicator LED.

12

None

Back-lit LCD screen (20 characters by 4 lines), viewable in bright sunlight and
low-light levels.

13

Up and Down

Arrows

The up and down arrows are used to control the current source output and
timer. Three modes are available:
ON+TMR : Turn on current source and timer
OFF: Turn off current source and timer
MONT: Turn on current source momentarily

14

CONTRAST

LCD screen contrast control.

15 & 16

EXT CURRENT

(0-10A)

External current input connectors.

17

DRY CONTACT

WET CONTACT

CURRENT

Timer and current source stop input selection with LED indicator.

18 & 19

TIMER STOP

Timer “STOP” input connectors.