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Effective 8/2006
Page 19
I.L. 66A7534H04
5.3.2 Handheld Functional Test Kit
5.3.2.1 Description of Handheld Test Kit
A battery powered test kit is also available and capable of
testing trip elements for Digitrip 520V and 520MCV units,
including power up, Instantaneous Trip, Short Delay Trip,
and Ground (Earth) Fault Trip. These test selections are
chosen with the switch labeled
Select Test
located in the
upper right hand corner of the test kit
(See Figure 5.1).
The test currents are DC currents set at the factory and
are not adjustable.
The style number of this device is # 70C1056G52
(120VAC) or #70C1056G53 (230VAC).
5.3.2.2 Test Procedure
Complete procedural instructions for the Cutler Hammer
Mini Test Kit can be found in I.L. # 5721D13 which is
packaged with each test kit.
NOTE:
After completion of testing,
1. Disconnect secondary connector with jumper
2. Disconnect test input cable
3. Reposition all trip unit settings to “as found”
4. Reposition the LTM (Long Time Memory) jumper
5. Reinstall the test port cover on the Digitrip
6. Reinstall plexiglass cover to circuit breaker
5.3.2.4 Batteries
This Functional Test Kit contains a total of seven 9-Volt
batteries. A lithium ion cell is the preferred battery type for
Battery Voltage
(A) and is attached to the main pc board of
the test kit. This battery has a much longer life span to
accurately perform the selected tests. The remaining six
batteries are located on a separate board in the test kit
and serve to power up the Digitrip trip unit.
Battery status LED’s A and B function to represent
sufficient voltage from both the single lithium cell and the
six Alkaline batteries, respectively. If either LED does not
light or lights dimly, replace the appropriate battery or
batteries within the test kit case. To do this, open the back
of the case using a screwdriver and remove the battery or
batteries from their respective locations. For best results,
replace lithium battery (Battery A) with ULTRALIFE
®
U9VL
Battery. When replacing battery six-pack (Battery B),
replace all batteries at the same time using standard 9V
alkaline batteries.
5.4 Performance Testing of Digitrip 520V and 520MCV
Trip Units
5.4.1 General
The complete circuit breaker should be tested after sensor
wiring is completed. The AVO Multi-Amp
®
model MS-2 or
equivalent current source can be used to perform this test
(See Figure 5.2)
.
Figure 5.1 Functional Test Kit
5.4.2 Testing using MS-2 Multi AMP
®
Tester
5.4.2.1 Description of MS-2 Tester
The portable (33lb/15kg) AVO Multi AMP
®
tester, model
MS-2 can be used to check out Digitrip 520V. There are
two levels of testing that can be done. A primary or
secondary injection test can be done. The primary injection
test is good for verifying both CH Type-V current sensor
polarity and hookup through the circuit breaker’s secondary
5.3.2.3 Currents
Each test chosen by the
Select Test
switch on the test kit
supplies a fixed milliampere current value.
NOTE:
The
Long Delay Setting
will affect the per unit (Ir)
current value.