I.L. 32-693 A
Page 3
Effective September 1998
SECTION 1: INTRODUCTION
1.1 GENERAL INFORMATION
The Trip Unit Test Kit is used to test and verify the pickup
levels and time delay settings of a breaker’s Trip Unit. The
original Test Kits were developed to test the Amptector
Trip Units of the DS Breaker. With the introduction of
microprocessor based Trip Units (Digitrip, Optim, etc),
modifications to the original Test Kits (-G01 and –G02)
were required to accommodate lower power requirements
of the microprocessor. These modifications, in combina-
tion with various Test Kit Adapters, allow maintenance
personnel to utilize the Test Kit they already own when
testing the newer generations of Trip Units.
The Test Kit Adapter (Style # 8779C02G04) for the Mag-
num DS Digitrip Trip Units, converts the 11-pin banana plug
on the Test Kit, to a 14-pin plug. This 14-pin plug, plugs
into the Trip Unit Test Port, located on the face of the Trip
Unit. (see Figure 4)
SECTION 2: TEST KIT / BREAKER INFORMATION
2.1 TEST KIT / ADAPTER INFORMATION
2.1.1 TEST KIT CONTROLS (SEE FIGURE 1)
The following are the identifications and fuctions of the
Test Kit controls. Any time these are referred to in the
following portions of this publicaiton they will be in italics
and underlined as shown in the following definitions of the
functions.
POWER ON/OFF – Turns on power to the Test Kit.
STOP – This switch manually cuts off the test current to
the Trip Unit.
LONG DELAY PICKUP - This light is not functional for
Magnum DS trip units.
TEST – Starts the test.
RESET– Resets the Test Kit after a test.
CALIB – Used in conjunction with CURRENT ADJUST
allowing for setting a pre-determined current level prior to
a test.
INST Operative / Read Amps – For testing the Instanta-
neous function on Amptector Trip Units. (Not functional
with Magnum DS trip units.)
SHORT DELAY Operative / Read Amps – For testing the
Short Delay function.
GROUND TEST – For testing the Ground Fault function.
EXT. AM – Allows for connection of an external ammeter
to read current levels. Jumper must be installed when not
using external ammeter.
CIRCUIT SELECTOR - Permits checking of all Trip Unit
phase input circuits. Since all feed into a common pickup
and timing circuit, it is only necessary to use one phase to
test all the solid state circuitry functions. It is only neces-
sary to use one circuit function (e.g., long delay pickup) to
verify that each phase (A, B, and C) performs similarly.
TIMER ON/OFF – The timer is used to calculate and display
the time-delay functions of the Trip Unit.
RESET (Timer) - Resets the timer after a test.
HI / LO AMPS – Selects the “level” of current to be in-
jected. (LO AMPS is typically for checking Long Delay
Pickup or Ground Fault Pickup, and HI AMPS is for checking
Short Delay Pickup or Instantaneous Level)
CURRENT ADJUSTMENT – Adjusts the secondary current
injected into the Trip Unit.
2.1.2 TEST KIT ADAPTER
The Magnum DS Test Kit Adapter (8779C02G04) is used to
connect the Test Kit’s 11-pin plug to the Magnum DS
Digitrip Trip Unit 14-pin test port. In additon, the Auxiliary
Power Module (PRTAAPM), which is permanently con-
nected to the Adapter, must be connected to a 120 V, 50/
60 HZ source to supply control power to the Trip Unit. (see
Figure 2)
2.1.3 ZONE INTERLOCK SHORTING PLUG
The Zone Interlock Shorting Plug (8779C02G06) is
required when the breaker is removed from the switchgear
cell for testing. The Shorting Plug must be installed on the
breaker secondary contacts to defeat zone-interlock
wiring. (see Figure 3)
2.1.4 TEST KIT OPERATION GUIDELINES
To minimize thermal stress on the Test Kit and Trip Unit,
hold
CALIB (momentary) toggle switch for no more than 15
to 20 seconds at a time.
If current persists after the test is complete, use
STOP
switch to turn off the current.
When checking settings on the Trip Unit, the general
procedure is to start with the high current settings and
work down to the lowest current setting. This avoids
unnecessary dial changes after calibration.
