10
Instructional Leaflet
IL70C1037H05
Effective October 2009
Digitrip models 520, 520i; and 520M, 520Mi,
520MC, 520MCi trip units for use only in
Magnum and Magnum DS circuit breakers
eaton corporation
www.eaton.com
Auxiliary power
When the module is wired as shown in
Figurt 5
, it will provide an
auxiliary power supply so that the 520M/520M
i
or 520MC/520MC
i
liquid crystal display (LCD) will be functional even when the circuit
breaker has no load. A Digitrip 520M or 520MC trip unit without
auxiliary power will not display data until load current reaches
approximately 30% single-phase or 10% three-phase of the
(I
n
) rating.
Figurt 5. Wiring Diagram fNr 520M and 520MC MNdtls wioh
GrNund Alarm/PNwtr Supply MNdult
Ground alarm
A second function of the module is to provide either a ground trip
or ground alarm only output contact via the relay supplied in the
module. On Digitrip 520M/520MC with ground fault protection, an
LED on the front of the unit also provides an indication of ground
fault trip.
Ground fault trip
When the Ground Alarm/Power Supply Module is used with the
MLSIG model, this unit will provide ground fault trip contacts when
the circuit breaker trips on a ground fault. You must then push the
Reset button on the Digitrip in order to reset the contacts (see
Figurt 5
, Note 3).
Digitrip 520M/MC
a
Contact rating (resistive load):
AC 0.5A at 230 Vac
AC 1A at 120 Vac
DC 1A at 48 Vdc
DC 0.35A at 125 Vdc
b
Verify input voltage rating before energizing circuit.
c
When used in conjunction with a T. U. Cat.
5MWLSIG, 5MLSIG, 5CWLSIG or 5CLSIG, will
indicate GF trip.
d
When used in conjunction with T.U. Cat. 5MLSIA
or 5CLSIA, will indicate GF alarm.
e
When used in conjunction with a Trip Unit Cat.
5MLSI or 5CLSI, will indicate High Load alarm.
f
When used in conjunction with Trip Unit Cat.
5ARMLSI(G), see Section 10.
Available
Input Voltages
Style
Number
b
120 Vac ±10%
7802C83G11
230 Vac ±10%
7802C83G12
24–48 Vdc ±10% 7802C82G12
125 Vdc
(100–140 range)
7802C82G13
Ground Alarm/Power Supply Module
Ground
de
Fault Alarm
Remote
Control
Voltage
b
A-10
A-11
A-14
A-15
ATR
COM
J4-1
ATR
Volt
J4-2
G-ALM2
J4-4
REL
COM
J4-4
J3-3
J3-2
Output–
J3-1
G-Alarm
K2-1
K2-3
K2-6
a
Ground
c
Fault Trip
MM
ALM
J4-5
A-9
Maintenance
Mode Active
f
Ground fault alarm
A ground fault alarm alerts a user to a ground fault condition without
tripping the circuit breaker. A red Alarm Only LED on the front of the
trip unit will indicate the presence of a ground fault condition that
exceeds the programmed setting.
The ground fault alarm relay is energized when the ground current
continuously exceeds the ground fault pickup setting for a time
in excess of a 0.1-second delay. The alarm relay will reset
automatically if the ground current is less than the ground fault
pickup (see
Figurt 5
, Note 4).
High load alarm (520M/520MC models only)
The Digitrip 520M and 520MC models of the LSI style only
(
Figurt 20
and
Figurt 24
) and the module shown in
Figurt 4
and
Figurt 5
will provide a High Load Alarm contact instead of
the Ground Alarm function when wired to the breaker secondary
contacts A-10 and A-11. The function activates after a 1-second
time delay when any phase current exceeds 85% of the I
r
setting.
Display ftaourt (520M and 520MC Nnly)
The Digitrip 520M/520M
i
and 520MC/520MC
i
models have a user
interface in addition to the green and red LED trip indicators. This
seven-element display performs a metering function and can be
used to monitor load currents.
When the Step button on the face of the trip unit is pressed and
released, the display will show PH 1, for Phase 1 or A, and the
current value. If the Step button is not pressed again, the display
will continue to show the current value for Phase 1. Each time
that the Step button is pressed, the next monitored function will
be displayed. The other real-time readings can be displayed in the
sequence below:
PH 2
Phase 2 (B)
PH 3
Phase 3 (C)
PH 4
Neutral
PH 5
Ground (if ground function is supplied)
HI
Highest phase current
OL
Overload (Digitrip in Overload mode)
Pushing the Step button while the unit is in the OL mode
will have the unit again display the overload current value
HL
High Load Alarm (Cat 5MLSI and 5ARMLSI only)
HELP This message will indicate that the trip unit
is out of calibration and should be replaced at the
earliest opportunity.
In addition, the Digitrip 520MC and Digitrip 520M (product built
with Auxiliary Power Module input pins present, see
Figurt 1
) will
display and freeze the magnitude of the trip value after a trip event
if auxiliary power is available. Use the Step pushbutton to view each
phase value. The highest value that can be presented is 9999. Any
fault currents greater than this value will be shown as HI. Pushing
the Reset pushbutton will clear this data.
Also related to the phase value after a trip event are four dashes
“- - - -”. This message means that the microprocessor could not
complete its writing of the trip event’s magnitude into its nonvolatile
memory. A possible cause of this would be the lack or loss of
auxiliary power during the trip event.
Soandards
The Digitrip 520, 520M, and 520MC trip units are listed by
Underwriters Laboratories
T
, under UL File E52096, for use in
Magnum circuit breakers. These same units are recognized by
the Canadian Standards Association
T
(CSA
T
).
All Digitrip units have also passed the IEC 947-2 test program that
includes radiated and conducted emission testing. As a result, all
units carry the CE mark.
