
CHAPTER 7: TESTING
FUNCTIONAL TESTS
MM3 MOTOR MANAGER 3 – INSTRUCTION MANUAL
7–3
7.2
Functional Tests
7.2.1
Phase Current
Functions
Any phase current protection is based on the ability of the MM3 Motor Manager 3 to read
phase input currents accurately. Make the following settings:
S2 PROTECTION
Ö
MOTOR PROTECTION THERMAL
Ö
FULL LOAD CURRENT
: “100 A”
S1 CONFIGURATION
ÖØ
STARTER
Ö
STARTER TYPE
: “FV NON REVERSING”
To determine if the relay is reading the proper input current values, inject different phase
currents into the CT inputs and view the current readings in
A1 DATA
Ö
MOTOR DATA
. The
displayed current should be equal to the actual injected current.
Phase current values will be displayed even if the motor status is stopped; that is,
contactor A has not been activated by a start command. Very low currents are displayed
as 0 A.
Once the accuracy of the phase CT inputs has been established, various phase alarm and
trip condition tests can be performed by altering setpoints and injected phase currents.
To simulate an overload condition, enter the
S2 PROTECTION
Ö
MOTOR PROTECTION
THERMAL
menu and set
OVERLOAD CURVE NUMBER
to “4” and
FULL LOAD CURRENT
to
“50 A”.
PHASE CT PRIMARY AMPS
should be set to “100 A”. Close the start A input and note
that the Running LED goes on. Inject a current of 10 A into all three phases. The relay will
display a current value of:
displayed current = actual injected current
×
100/5 = 10
×
100 / 5 = 200 A.
This represents 4 times the phase
FULL LOAD CURRENT
setpoint. Therefore, based on a
400% overload and curve #4, contactor A will change state 23 seconds after the overload
is first applied. When this occurs, the Running LED turns off and the Tripped and Stopped
LEDs are lit. After the trip has occurred, use the
A1 DATA
Ö
MOTOR DATA
actual values to
verify that the thermal capacity used is now 100%. Press the RESET key to reset the MM3
Motor Manager 3.
To prepare the MM3 Motor Manager 3 to simulate an unbalance alarm, make the following
settings. In the
S2 PROTECTION
ÖØ
MOTOR PROTECTION OPTIONS
menu, set:
PHASE UNBALANCE ALARM
: “ENABLE”
In the
S4 CONTROL
ÖØ
AUX RELAY 1 CONFIG
menu, set:
AUX RELAY 1 FUNCTION
: “ALARMS”
In the
S4 CONTROL
ÖØ
AUX RELAY 2 CONFIG
menu, set:
AUX RELAY 2 FUNCTION
: “TRIPS”
Inject 5.0 A into all three phase CTs. The MM3 Motor Manager 3 displays a balanced phase
current of 100 A for each phase. While still viewing actual values, slowly begin decreasing
phase 1 current until the
UNBALANCE ALARM
message comes on. Auxiliary relay 1 should
energize when the alarm is present. Unbalance is calculated as follows:
For average currents greater than motor full load:
(EQ 7.1)
I
n
I
av
–
I
av
----------------
15% (alarm) 30% trip
>
Содержание MM3
Страница 8: ...vi MM3 MOTOR MANAGER 3 INSTRUCTION MANUAL TABLE OF CONTENTS ...
Страница 11: ...CHAPTER 1 INTRODUCTION OVERVIEW MM3 MOTOR MANAGER 3 INSTRUCTION MANUAL 1 3 Figure 1 1 Functional block diagram ...
Страница 18: ...1 10 MM3 MOTOR MANAGER 3 INSTRUCTION MANUAL TECHNICAL SPECIFICATIONS CHAPTER 1 INTRODUCTION ...
Страница 80: ...4 18 MM3 MOTOR MANAGER 3 INSTRUCTION MANUAL CHASSIS MOUNT UNITS CHAPTER 4 SOFTWARE ...
Страница 124: ...5 44 MM3 MOTOR MANAGER 3 INSTRUCTION MANUAL S7 TESTING CHAPTER 5 SETPOINTS ...
Страница 198: ...8 54 MM3 MOTOR MANAGER 3 INSTRUCTION MANUAL MODBUS MEMORY MAP CHAPTER 8 COMMUNICATIONS ...
Страница 220: ...10 14 MM3 MOTOR MANAGER 3 INSTRUCTION MANUAL GE MULTILIN WARRANTY CHAPTER 10 MISCELLANEOUS ...