P&B MPC2000+ Technical Manual page 23

MPC2000+ Technical Manual
Undercurrent Alarm
If the current falls the MPC2000+ will sense this and an alarm will be signalled at a set percentage of FLC. This
setting has a range 10 - 90% in steps of 1% of FLC, with a default setting of 50%.
Undercurrent Alarm Delay
Linked to the undercurrent alarm this function can be pre-set to determine how long an undercurrent below the setting
can occur before an alarm will be signalled. It may be set between the range of 1 and 60 seconds in steps of 1s, with a
default value of 2 seconds.
Undercurrent Trip
This setting specifies below what undercurrent level the unit will trip. It is adjustable between the range of 10 and
90% of FLC in steps of 1%, with a default value of 40% of FLC.
Undercurrent Trip Delay
This sets a time between the unit registering an undercurrent level and the actual tripping of the unit. Adjustable by the
user between the range of 1 and 60 seconds in steps of 1s, with a default setting of 5 seconds.
Load Increase Alarm
Should the load on the motor increase during operation the MPC2000+ can sense this and signal an alarm. The pick
up level is adjustable between the range of 60 and 150% of FLC and has a default setting of 120% of FLC, with a
fixed time delay of 5 seconds.
Low Set Overcurrent
This setting is not in service during starting. It can be set between the range of 100 and 500% in steps of 10% of FLC
to afford the user a faster tripping time for overcurrent conditions than that available from the overload curve. The
default for this setting is 400% of FLC. This feature can also be used to provide a fast operating definite time stall
protection after the motor is running.
Low Set Delay
This setting determines the time of the delay between the unit registering a low set overcurrent and an alarm or trip
being signalled. The setting is adjustable between the range of 0.5 and 10 seconds in steps of 0.5s, with a default
setting of 2.0 seconds.
High Set Overcurrent
This feature is normally enabled when the motor is being controlled by a circuit breaker rather than a fuse contactor.
The High Set Overcurrent unit can be set between the range of 400 and 1200% in steps of 10% of FLC, with a default
value of 800%.
High Set Delay
User set from the keypad, this setting determines the time between registering a High Set Overcurrent and an alarm or
trip being signalled. Adjustable between the range of instantaneous to 4 seconds in steps of 0.1s with a default setting
of 'Instantaneous'.
Overload Setting
Pre-settable overload setting range 60 to 130% in steps of 1% of FLC, with a default and P&B Engineering's
recommended setting of 105% of FLC. For further information refer to section 'MPC2000+ Thermal Overload
Protection'
Thermal Capacity Alarm
User settable to specify a thermal capacity alarm value between the range of 50 and 99% in steps of 1% of capacity,
with a default setting of 80%.
t6x Time
This setting specifies the time the MPC2000+ will take to trip at 6 times FLC and determine the basic thermal
characteristic. This time range 0.5 and 120 seconds, with a default setting of 10 seconds. For further information refer
to section 'MPC2000+ Thermal Overload Protection'
P&B Engineering ISSUE 7 28/9/99 Page 19