Protection
Advanced Protection
Every facility has equipment critical to its operation
and productivity. This equipment is often controlled by medium voltage
AC motors.
The MVC Plus Series soft starter provides the highest standard of
motor control and unsurpassed protection for these critical motor applications.
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 All the features of a motor protection relay without
the added cost.
- True Thermal Modeling monitors the motor for excessive
thermal conditions due to starting, running , Motor Thermal and even
ambient Model conditions. 0%
- Retentive Thermal Memory for continuous overload
protection even after a complete power loss. When power is restored,
the MVC Plus remembers the last thermal condition of the 100% motor,
observes the off time via a real-time clock and adjusts the thermal
model accordingly.
- Non-Volatile Memory stores the thermal memory
without the need for batteries.
- True Time Thermal Tracking adjusts the thermal
model for different cooling rates based on motor temperature, running
state or power loss.
- Dynamic Reset Response Reset is only allowed after
the motor has sufficient thermal capacity for a successful restart.
- Thermal Model Biasing adjusts for heating effects
of phase current imbalance or optional RTD inputs.
Flexible Setup
Choose the level of overload protection.
- Programmable Trip Classes selectable fromNEMA/UL
Classes 5 - 30.
- Dual Mode Protection separate trip curves forstart
and run modes (example: Class 20 for start, Class 10 for run).
- Warning Levels can be programmed and assigned
to one of six built-in output relays.
- Custom Trip Curve programmable based on the motor
manufacturer's data or it can use a "Learned Overload Curve" that
reflects normal running condition with a programmable trip bandwidth.
- Remote or Automatic Overload Reset can be activated
for unattended operations.
|
ANSI
/ IEE
Number
|
System
/ Protection Features
|
Standard
|
19
|
Reduced voltage soft start |
YES
|
27
|
Under voltage |
YES
|
37
|
Undercurrent |
YES
|
46
|
Current Imbalance |
YES
|
47
|
Phase rotation |
YES
|
48
|
Locked rotor / Incomplete sequence |
YES
|
49
|
12t electronic motor overload |
YES
|
50
|
Instantaneous electronic over current trip |
YES
|
51
|
Over current |
YES
|
55
|
Power factor trip |
YES
|
59
|
Over voltage protection |
YES
|
66
|
Starts per hour and time between starts |
YES
|
81
|
Frequency variance
|
YES
|
86
|
Lockout / start inhibit
|
YES
|
50N/51G/N
|
Ground fault detection, instantaneous and current |
Optional
|
48/38
|
Stator and bearing RTD protection |
Optional
|
14
|
Speed switch and tachometer trip |
Optional
|
The MVC Plus Series soft starter provides the system protection features
found in expensive "stand-alone" Motor Protection Relays, without
costly add-on cards or discreet devices.
- Over Current / Electronic Shear Pin trip and alarm safeguards
your motor and equipment. Protects against jammed loads, sand in pumps,
detects worn
out blades, etc.
- Under Current / Load trip and alarm sensing detects
an underloaded motor due to shaft/belt breakage or loss of prime in pumping
systems.
- Dual Mode Short Circuit Trip (exclusive "toe-inthe-water" circuit)
pre-checks the motor to prevent starting into a shorted load. In the Run
mode, it becomes an "electronic fuse" tripping faster than most
fuses and circuit breakers.
- Phase Rotation, Phase Loss and Current Imbalance Protection
- Under Voltage, Over Voltage and Line Frequency trips and alarms protect
against power problems from the utility or generator.
Ground Fault Option
Zero Sequence ground fault protection can be provided to protect equipment
from damage due to faulty grounded conductors or motor windings. Separate
High (fast) and Low (slower) trip points and alarm levels are available
to help prevent nuisance trips. The ground fault protection (T uses a fiber
optic connection for safety isolation. RTD Input Option for Precise Thermal
Management
 Thermally
biased, programmable RTD inputs can be multiple types and can be individually
named. Each RTD
can be assigned to an output relay with different values for alarm
or trip. Temperatures are recorded to the fault history and
can be used to activate warning or trip relays based on setpoints.
12 RTD inputs can be configured in software to match the RTD material used
and can be monitored at the keypad or remotely. Real-time Clock Features
- Coast Down/ Back Spin Lockout (programmable up to 60 minutes) prevents
a start attempt when the motor /Ioad is backspinning when the motor is
turned off.
- Elapsed Time Metering indicates run time for scheduled maintenance or
trouble shooting help.
- Time Between Starts Lockout eliminates motor and equipment damage caused
by repeated start commands.
- Time and Date Stamping of faults for precise recording of what happened
when.
- Starts-per-Hour Lockout/Short Cycle Timer allows you to program the maximum
number
of starts per hour and provides a programmed "wait time" (0 - 60 minutes)
between start attempts.
Contact Joliet Technologies for pricing,
availability and freight options.
Phone: (815) 725-9696 or
Toll Free: (866) 492-9888
Fax: (815) 725-9393
E-mail: info@joliettech.com
RFQ - Request for Quote
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1724 Tomich Court