I.L. 32-693 A
Page 5
Effective September 1998
Note: If current reading remains at zero, check to see
that the shorting bar is across “EXT AM” Terminals and
that the terminals are tight. If the shorting bar is
missing a substitute can be made using #10 wire and
spade terminals.
8.
Return CURRENT ADJUSTMENT knob to “ZERO”.
9.
Note: This step should be performed with the breaker
in the open position. If the main contacts are closed,
the breaker will trip open.
9A. Put
HI / LO AMPS switch in “HI AMPS” position. Hold
CALIB toggle switch (momentary) in “CALIB” position
and turn
CURRENT ADJUSTMENT knob from zero to
maximum. Ammeter should read from zero to ap-
proximately 50 amperes.
10. If any of the above checks do not function as intended,
operate the
STOP switch and RESET button and
repeat the check. If the situation persists, contact
Cutler-Hammer.
SECTION 4: TESTING THE TRIP UNIT
4.1 LEGEND
I
n
= Rating Plug Value (must match Sensor Rating, I
s
)
I
g
= Ground Fault Current Pickup (See Table 1)
I
t
= Test Kit Trip Current
I
n / s
= I
n
/ I
s
I
pu
= Trip Unit Dial Setting
I
r
= Long Delay Pickup x Short Delay Pickup
4.2 GENERAL SETUP
1.
Hardware Connections (refer to Figure 2):
1A. Connect the 11-pin banana plug on the Test Kit to the
corresponding port on the Test Kit Adapter.
1B. Connect the 14-pin plug from the Test Kit Adapter into
the corresponding test port on the Trip Unit.
2.
Plug the APM and the Test Kit into 120 volt, 60 Hz
source. (Test Kit can be used on 50 Hz but timer
readings must be multiplied by 6/5.) The green “Unit
Status” LED should flash indicating that the Trip Unit is
operational.
3.
Turn the Test Kit POWER switch “ON”.
4.
It is recommended that a check of the Trip Unit per
Section 4.3 below be performed prior to performing
any of the other tests.
4.3 CHECKING THE TRIP UNIT
1.
Remove the ac supply from the Auxiliary Power
Module.
2.
Set the Test Kit as follows:
2A.
TIMER ON/OFF switch to “OFF”.2 . HI-LO switch to “LO
AMPS”.
2C.
CURRENT ADJUSTMENT to “ZERO”.
3.
Push
RESET button and then the TEST button.
4.
Slowly increase current via
CURENT ADJUSTMENT
knob until green “Unit Status” LED located on upper left
hand comer of Trip Unit starts to flash. This must
occur at 1.8 amperes or less to indicate that the Trip
Unit is functional.
5.
Reconnect the APM to the ac supply.
4.4 CHECKING LONG DELAY PICKUP (L.D.P.U.)
1.
Set Test Kit as follows:
1A.
TIMER switch to “OFF”.
1B.
HI-LO switch to “LO AMPS”.
1C.
CIRCUIT SELECTOR switch to “A”.
1D.
CURRENT ADJUSTMENT to “ZERO”.
2.
Set the long delay setting on Trip Unit to desired
setting.
3.
Push
RESET button and then the TEST button.
4.
Slowly increase current via
CURRENT ADJUST MENT
knob until the “Unit Status” LED on Trip Unit starts to
flash quickly. This should occur at the pickup current,
which will be the long delay setting of the Trip Unit
times 5 amperes (+/- 10%). The rate of flashing will
slow to normal when the current is lowered below the
pickup setting. NOTE THAT THE LONG DELAY PICKUP
LAMP ON THE TESTER WILL NOT LIGHT.
5.
Use
STOP switch to cut off current.
6.
Repeat 3 and 4 with the
CIRCUIT SELECTOR switch on
“B” and then on “C”. (See section 2.2.2 regarding the
Trip Unit’s thermal memory circuit)
