Page 6-1
MPS Motor Protection System Rev. 6-F-022117
Starter Functions
6. STARTER FUNCTIONS
OPI Menu: Setup | Starter
6.1 GENERAL
All common starter types are supported. From the OPI
Starter Type menu, select one of seventeen starter types or
select Protection Only. Starter types requiring two FLA
settings are indicated by the “
x
” symbol in the OPI
display.
When Protection Only is selected, all starter functions
except STOP are disabled and all OPI control-select
LED’s will be off. Any STOP signal will initiate a Trip1
when the MPS is in Protection Only.
NOTE: When Protection Only is selected, STOP will not
function if Trip1 is not assigned to a relay output.
When Protection Only is selected, the OPI STOP and
RUN LED’s are controlled by motor current. When
motor current is below the minimum Current Threshold
defined in Section 3.2.1.2, the STOP LED is on and RUN
LED is off. When motor current is above the minimum
Current Threshold, the STOP LED is off and RUN LED
is on. When a starter type is selected, the STOP and RUN
LED’s are under starter control and not based on motor
current.
When a starter type is selected, starter control can be
performed with the digital inputs, OPI, or network
communications. See Section 4.3.3 for details on
selecting start sources.
Three control modes are available and selected using
the OPI CONTROL SELECT key. In addition, a digital
input can be used to select LOCAL. Each control mode
has specific start sources that can be programmed as
shown in Table 6.1. REMOTE control can be configured
to operate with start sources from the digital input, OPI
and the network. OPI Control uses the OPI start keys as
the start sources. LOCAL control uses the Local Start1 or
Local Start2 start sources or the OPI. In LOCAL mode,
OPI control can be enabled or disabled. Control selection
is indicated by the REMOTE, OPI, and LOCAL LED’s
on the OPI.
The digital inputs allow concurrent operation of three
start-control methods; 3-wire start/stop, 2-wire start/stop,
and 3-wire local start/stop. Three-wire control requires
two digital inputs, one programmed for Start1 or Start2
(N.O. momentary start switch) and one programmed for
Stop (N.C. momentary stop switch) as shown in Fig. 6.1.
Two-wire control uses one input, programmed as 2-Wire
Start1 or 2-Wire Start2, for start/stop control and can be
used where a single contact provides start/stop operation.
See Fig. 6.2. If a start was activated by a 2-wire start
input, any other STOP will initiate a latching Trip1. In all
other cases, STOP does not cause a trip.
Digital inputs programmed for Limit1 Stop and Limit2
Stop are used to provide stop control for Start1 and
Start2. This is typically used in reversing starter
applications. The forward-direction limit switch is
connected to the Limit1 Stop input and the reverse-
direction limit switch is connected to the Limit2 Stop
input.
With this control method, a Start1 requires limit switch
1 to be closed and limit switch 2 is ignored. In a similar
manner, Start2 requires, limit switch 2 to be closed while
limit switch 1 is ignored.
NOTE: When starter functions are used, protective
functions with the trip action set to Trip1 will cause the
starter to stop when a trip occurs. Reset is required.
Table 6.1 indicates the available start sources.
TABLE 6.1 START-SOURCE SUMMARY
(1)
(1)
All STOP sources are always enabled.
(2)
Factory default has all sources enabled and REMOTE
selected.
(3)
Can be enabled or disabled using the Setup | Starters |
Remote Group menu.
(4)
STOP causes a latching trip.
(5)
LOCAL can also be selected by a network command
or by a digital input programmed for Local Select.
Each Local Select source must de-select local control
for the MPS to return to the previous control setting.
(6)
I
2
t Start Inhibit, Starts per Hour alarms and Interlocks
are bypassed.
(7)
At least one Control Selection must be enabled even
when Protection Only is selected.
(8)
Can be enabled or disabled using the Setup | Starters
| Local Group menu.
Up to four timers (Stage 1 to 3 Delay, and Start Time)
control the start sequence. These timers control Starter
RLYA, Starter RLYB, Starter RLYC, and Starter RLYD as
shown in the timing diagrams in Section 6.2. These
functions can be assigned to any output relay. Digital
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