Page 4-3
MPS Motor Protection System Rev. 6-F-022117
Operation and Setup
When a trip occurs, all assigned starter-control relays
(Starter RLYA to Starter RLYD) are de-energized and
relays assigned the Trip1, Trip2, or Trip3 function
operate. The trip signal may originate from a protective
function, from a digital input assigned the Trip1 function,
or from a communications network command. See
Sections 4.2.8 and 6.
Relays assigned to trip or alarm functions operate in
fail-safe or non-fail-safe mode. Set the mode using the
Setup ⏐ Relay Outputs ⏐ Relay x ⏐ Mode menu.
Except for overload trips, which can be selected to
auto-reset, trips must be reset with an MPS-OPI, a digital
input, or a network command. A trip cannot be reset
when the trip condition is present.
When a protective function issues an alarm, relays
assigned to the corresponding Alarm1, Alarm2, or
Alarm3 function operate. Alarms auto-reset when the
alarm condition is corrected.
Relays assigned the Interlock function energize when
all digital inputs assigned the Interlock function are valid
(voltage detected at digital input).
4.2.8 DIGITAL INPUTS 1 TO 7
OPI Menu: Setup | Digital Inputs | Digital Input x |
Input x Function
OPI Menu: Setup | Digital Inputs | Digital Input x |
In x Start Bypass
OPI Menu: Setup | Digital Inputs | Digital Input x |
In x Bypass Delay
OPI Menu: Setup | Digital Inputs | Digital Input x |
In x Trip Delay
Each digital input can be assigned to one of the
functions listed in Table 4.2. More than one digital input
can be assigned the same function.
Start inputs are not active when Protection Only is
selected as the starter type. The STOP function is always
active. In Protection Only mode, STOP initiates a Trip1
signal.
Each digital input assigned the Trip1 function has Start
Bypass, Bypass Delay, and Trip Delay set points. When
Start Bypass is enabled, the Trip1 function is bypassed
during a start for the duration specified by Bypass Delay.
Since start detection is based on motor current, this
feature can be used in the Protection Only mode. After
the Bypass Delay, the Trip1 function is enabled and a trip
occurs if the digital-input voltage is removed for the time
specified by the Trip Delay. If Start Bypass is disabled,
Bypass Delay is not used and the Trip1 function is always
enabled. The bypass feature can be used in pump-control
applications to allow time for a pressure switch to close.
Reset inputs are “one-shot” resets that require a
transition from open to closed. Maintaining a reset switch
closure does not inhibit trips.
TABLE 4.2 DIGITAL-INPUT FUNCTIONS
(1)
1 = Input voltage applied, 0 = Input voltage not
applied.
(2)
Interlocks bypassed in LOCAL.
(3)
Applies only to Protection Only mode.
LOCAL is selected using the OPI, the digital input,
or by network communications. The Local Select source
is responsible for de-selecting. For example if both the
digital input and the network communications select
LOCAL, both must also de-select LOCAL. The Local
Select – and Local Select + selections allow the digital
input to select LOCAL control. Both positive and
negative logic versions allow implementation of various
“Hand-Off-Auto” control schemes. See Section 6 for
CONTROL SELECT operation.
In applications where MPS starter functions are not
used, FLA2 Select can be used to switch between FLA1
and FLA2. This applies only to Protection Only mode.
The selected FLA is displayed in the Metering ⏐ System
State menu.
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