AVO CB-845X User manual

Part _ S/O 81892
Rev. 0
INSTRUCTION MANUAL
For
CIRCUIT BREAKER
TEST SET
MODEL CB-845X
It is essential that this instruction book be read thoroughly before putting the

Part _ S/O 81892
Rev. 0
equipment in service.
IMPORTANT
The information and data contained within this instruction manual are proprietary with AVO
MULTI-AMP Corporation. The equipment described herein may be protected by one or more
U.S. letters patent. AVO MULTI-AMP specifically reserves to itself all rights to such
proprietary information as well as all rights under any such patent, none of which is waived by
the submission of this instruction manual to anyone.
The recipient, if a Government agency, acknowledges that this instruction book and the
equipment described were procured with "Limited Rights" to technical data as described in
ASPR 9-203 (b).

Part _ S/O 81892
Rev. 0
Copyright AVO MULTI-AMP Corporation, 1993
TABLE OF CONTENTS
I. General Information Page
A. General Description 1
B. Common Test Applications 1
C. Specifications 1
D. Description of Features 3
E. Operational Safety 6
F. Input Circuit 6
G. Selection of Input Leads 7
H. Output Circuit 8
I. Selection of Output Leads 8
J. Overload Capacity 9
II. Test Procedures
A. Time Delay Test - Motor Overload Relays 10
B. Instantaneous Test - Motor Overload Relays 11
C. Time Delay Test - Molded Case Circuit Breakers 13
D. Instantaneous Test - Molded Case Circuit Breakers 14
E. Trip Test - Ground Fault Interrupters 15
III. Maintenance Procedures
A. Maintenance of Molded Case Circuit Breakers 17
B. Maintenance of Motor Overload Relays 18
IV. Model CB-845X Maintenance
A. General Maintenance Procedures 21

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B. SRO Instructions 22
C. CB-845X Parts List 23
D. Warranty Statement 25

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GENERAL DESCRIPTION
The Multi-Amp Model CB-845X Circuit Breaker Test Set is a self-contained unit which
provides a continuously adjustable high current output and incorporates a digital
ammeter, digital timer and control circuitry. The test set consists of two units housed in
interlocking, stackable, rugged, metal enclosures. Each unit has convenient carrying
handles for easy portability.
COMMON TEST APPLICATIONS
Multi-Amp Model CB-845X is specially designed to provide high current at sufficiently
high voltage for testing ground grids or high impedance circuit breakers.
The Model CB-845X is suitable for a wide variety of testing requirements including
molded case circuit breakers, thermal, magnetic or solid-state motor overload relays
and other overcurrent protective devices. Additional applications include ratioing
recurrent transformers and testing ground fault trip devices.
SPECIFICATIONS
Input (switch-selected): 208 and 240 volts, sin
g
le-phase, 60 hz. + 5%
Output Ran
g
e: The output is continuousl
y
ad
j
ustable throu
g
h 7
ranges to meet a wide variety of test circuit
impedances.
0-5.5 volts at 1000 amperes
0-11 volts at 500 amperes
0-22 volts at 250 amperes
0-44 volts at 125 amperes
0-88 volts at 62 amperes
0-176 volts at 31 amperes
0-350 volts at 15 amperes
Ammeter: A solid-state di
g
ital instrument with a 0.3" (7.62
mm) LED 3 1/2 digit display.
Ran
g
es (switch selected): 0-19.99/199.9/1999 amperes/10.00 kiloamperes
Accurac
y
(overall ammeter
system):
+ 1% of readin
g
+ 1 di
g
it for 0-199.9/1999 amperes-
/10.00 kiloamperes ranges.
+1% of range + 1 digit for 0-19.99 amperes range
Modes (switch-selected):
Memor
y
: Read-and-hold memor
y
feature retains current

2
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readin
g
after one complete c
y
cle.
Normal: Continuall
y
updates ammeter readin
g
as current
changes.
Timer: A solid-state cr
y
stal controlled di
g
ital timer with
0.3" (7.62 mm) LED 5 digit display.
Seconds Mode:
Ranges: 0-99.999 seconds
0-999.99 seconds
Accurac
y
: + .005% of readin
g
+ 1 di
g
it
C
y
cles Mode:
Ran
g
e: 0-99999 c
y
cles
Accurac
y
: + .005% of readin
g
+ 1 c
y
cle
Output Capacit
y
: Where the output volta
g
e is sufficient to "push"
higher than rated current through the impedance of
the load circuit, the test set may be overload for
short durations as shown below.
PERCENT
RATED CURRENT
MAXIMUM
TIME ON
MINIMUM
TIME OFF
100% 30 minutes 30 minutes
200% 75 seconds
6 minutes
300% 25 seconds
4 minutes
Protectio
n
: Overload and short circuit protection is
incorporated.
Housin
g
: Hi
g
h stren
g
th, metal enclosures with eas
y
-to-carr
y
handles.
Dimensions:

3
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Control Unit - Hei
g
ht: 11 1/4 inches
Width: 21 inches
Depth: 17 1/2 inches
Output Unit - Hei
g
ht: 11 1/4 inches
Width: 21 inches
Depth: 19 1/2 inches

4
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Wei
g
ht:
Control Unit: 89 1/4 pounds
Output Unit: 205 pounds
Complete Unit: 294 pounds
Test Leads: Two No.22 timer leads each 5 feet (1.5 m) lon
g
.
These leads are used to connect the binding posts on
the CB-845X labeled CONTACTS to the contacts of
the device under test which will open or close when
the device operates. Two No. 4 high current leads,
each 5 feet (1.5 m) long and two No. 4/0 high
current leads, each 4 feet (1.2 m) long.
Interconnect Cable: Standard cable supplied to interconnect the control
and output units is 4 feet (1.2 m) long. An optional
cable 10 feet (3m) in length is also available.
DESCRIPTION OF FEATURES
NOTE: For greatest accuracy, allow 15 minutes for instrumentation warm-up.
POWER ON/OFF
SWITCH:
Molded case circuit breaker resets after an overload
when placed in the OFF position. Displays will light
up when the switch is turned on.
INPUT VOLTAGE
SELECTOR SWITCH:
Selects volta
g
e settin
g
to match volta
g
e source.
WARNING: SELECT PROPER VOLTAGE BEFORE TURNING POWER SWITCH
ON.
MAIN FUSE: Protects power output circuit of unit a
g
ainst
overloads.
CONTROL FUSE: Protects instrumentation and control circuitr
y
against overloads.
NOTE: Replace fuses with the same size and type as those supplied with test set.

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OUTPUT CONTROL: Variable autotransformer provides continuous no
n
-
stepped output from a variety of current terminals.
Output system is controlled by a combination of
timer STOP MODE and OUTPUT MODE Switch
positions.
AMMETER: LED displa
y
shows the numeral one in the left-most
digit when the meter is over-ranged.
RANGE SWITCH: Decimal of displa
y
shifts one di
g
it to the ri
g
ht for
each increase in range selection. Decimal moves to
two digits from right on highest range.
DISPLAY MODES: Switch selectable for NORMAL or MEMORY.
MEMORY: Retains hi
g
hest readin
g
attained durin
g
current
output operation above 8% of full scale of range
selected. Reading is retained until the unit is
reintiated or RANGE Switch position is changed.
NORMAL: Updates readin
g
s continuall
y
as lon
g
as output is
energized. Reading is lost when output is de-
energized.
TIMER: Automaticall
y
resets each time the unit is initiated.
DISPLAY MODES: Switch selectable for c
y
cles or seconds.
CYCLES: Reads in whole c
y
cles.
SECONDS: Two switch selectable scales of either two or three
decimal places.
NOTE: Changing display mode or scale during operation will produce erroneous
readings.
STOP MODES: Switch selected for external contact position or
current actuate.
NORM. OPEN: With CONTACTS bindin
g
posts connected to
normally open external contacts, output will remain
energized and timer will continue to run until
contacts close.

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NORM. CLOSED: With CONTACTS bindin
g
posts connected to
normally closed external contacts, output will
remain energized and timer will continue to run
until contacts open.
CURRENT: Timer will initiate onl
y
when output circuit is
completed and threshold current of approximately
8% of full scale of ammeter range selected is
exceeded. Timer will continue to run until output
circuit opens, drops below threshold level, or is de-
energized.
NOTE: Current must be maintained above threshold level or timer error will
result.
CONTACT BINDING
POSTS:
Circuit controls output and timer in the normall
y
open/closed stop modes when connected to external
contacts.
WARNING: DO NOT CONNECT CONTACTS BINDING POSTS TO AN
ENERGIZED CIRCUIT.
OUTPUT MODE SWITCH: Initiates output circuit in con
j
unction with
appropriate timer STOP MODE position.
OFF: Unit remains powered up but the output is de-
energized and the timer will not run.
MOMENTARY: Momentar
y
"ON" position with sprin
g
return to
center OFF. Output will remain energized as long
as the switch is held in MOM. position and is de-
energized when released. Timer starts and stops in
the same manner.. Used for "jogging" output the
circuit.
MAINTAIN: Switch ener
g
ized output circuit when moved to
MAIN. position. Output will remain energized until
appropriate STOP MODE function occurs, switch is
moved to OFF or current drops below threshold
requirement of control circuitry.
OUTPUT INDICATING
LAMP:
Li
g
hts up whenever output circuit is ener
g
ized.