Atec Megger-Multi-Amp-MS-2 - Manual (Page 2)

MS-2
Circuit Breaker and Overload Relay Test Set
The test set is capable of testing the time-delay characteristics of
devices rated up to 125 A using a test current of three times their
rating (375 A). Additionally, to perform an instantaneous trip test,
it will provide 750 A through a typical, 125 A, molded-case circuit
breaker connected with the test leads provided with the test set.
Overload Capability: To increase use of the test set, it is
designed so that the current ratings may be exceeded for short
durations. Because the magnitude of the output current is
determined by the impedance of the load circuit, the voltage
rating must be sufficient to push the desired current through the
device under test and the connecting test leads.
Percent Rated Maximum Minimum
Current Time On Time Off
100 (1x) 30 min 30 min
200 (2x) 3 min 8 min
300 (3x) 30 s 4 min
400 (4x) 7 s 2 min
Output Initiate Circuit: The test set uses a solid-state output
initiating circuit. To increase reliability and eliminate contact
maintenance, this circuit uses a triac instead of a contactor to
initiate the output.
The initiating circuit provides momentary and maintained modes
to control output duration. The momentary mode is used
whenever the output is to be on for a short duration, such as
when performing instantaneous trip tests, or to avoid damage or
overheating of the device under test while setting the test current.
In the maintained mode, the output remains energized until
manually turned off or, when performing timing tests, until the
device under test operates — which both stops the timer and
de-energizes the output.
INSTRUMENTATION
Ammeter
Operating Modes (switch-selected)
Memory
Normal
Display
3
1 /2 digit, extra-bright LED display with 0.3 in. (7.62mm) numerals
Ranges (switch-selected)
0 to 1.999/19.99/199.9/750 A
ContinousAccuracy (overall ammeter system)
±1% of reading, ±1 digit on three high ranges
Regulating: ±1% of range, ±1 digit on low range
Timer
Display
5-digit, extra-bright, LED display with 0.3 in. (7.62mm) numerals
Ranges (switch-selected)
0 to 99.999 s
0 to 999.99 s
0 to 99999 cycles
Accuracy
±0.005% of reading, ±1 digit
Timer Control Circuit
This circuit automatically starts the timer when the output is
energized and automatically stops the timer and de-energizes the
output when the device under test operates. This circuit
accommodates the following test conditions by simple switch
selection of the appropriate mode:
Current Actuated: Used to test a device that has no auxiliary
contacts to monitor, such as a single-pole circuit breaker. The
timer stops when the output current is interrupted.
Normally Closed: Used to test a device with normally closed
contacts. The timer stops and the output is de-energized when the
contacts open.
Normally Open: Used to test a device with normally open
contacts. The timer stops and the output is de-energized when the
contacts close.
Enclosure
The test set is housed in a high strength, molded, suitcase-type
enclosure with carrying handle and removable cover. Storage
space is provided for test leads.
Dimensions
9.9 H x 14 W x 11 D in.
(25 H x 35 W x 28 D cm)
Weight
33 lb (15 kg)
Item (Qty) Cat. No.
Model MS-2
115 volt input MS-2-115
230 volt input MS-2-230
Included Accessories
Timer control circuit leads, 5 ft (1.5 m) [2] 1282
Test and maintenance record cards
Green [50] 2239
Buff [50] 2238
ORDERING INFORMATION
Item (Qty) Cat. No.
No. 4 high-current leads, 5 ft (1.5 m) [2] 2265
Fuses
5 A, 250 V, MDA [5] 952
0.125 A, 250 V, MDL [5] 981
10 A, 250 V, MDA [5] 984
0.0625 A, 250 V, MDL [5] 987
Instruction manual [1] 8470
UK
Archcliffe Road Dover
CT17 9EN England
T +44 (0) 1304 502101
F +44 (0) 1304 207342
UNITED STATES
4271 Bronze Way
Dallas TX75237-1088 USA
T 800 723 2861 (USA only)
T +1 214 330 3203
F +1 214 337 3038
OTHER TECHNICAL SALES OFFICES
Valley Forge USA, Toronto CANADA,
Mumbai INDIA, Trappes FRANCE,
Sydney AUSTRALIA, Madrid SPAIN
and the Kingdom of BAHRAIN.
Registered to ISO 9001:2000 Reg no. Q 09290
Registered to ISO 14001 Reg no. EMS 61597
MS2_DS_en_V10
www.megger.com
Megger is a registered trademark