Technical Manual
Page 18
ISSUE 7 28/9/99
P&B Engineering
9.3. Voltage Settings
Undervoltage Setting
This setting range 50-95% in steps of 1% with default setting of 80% of line voltage determines the pick up level of
the Undervoltage protection. When the measured voltages reaches this level for the period equal to the Undervoltage
Delay period a trip will be performed, unless the Undervoltage Restart feature is selected.
Undervoltage Delay
This setting range 0.2-10 seconds in steps of 0.1s with a default setting of 5s determines how long an Undervoltage
condition must be, before a trip occurs.
Undervoltage Restart
This setting range 'Yes' or 'No' with default setting of 'No' allows the to monitors the Power Supply
(Terminals 4 & 5) and detect short voltage outages to provide automatic restart facilities. When set to 'Yes" , on
detection of a voltage dip or loss the will maintain the starting signal to the contactor for 200 msec at
which time the motor will be stopped. If the voltage is then restored within 4 seconds the will restart the
motor after the pre-set time delay. If the voltage does not return within 4 seconds the motor will not be restarted.
Undervoltage Restart Delay
This setting range 0.2-120 seconds in steps of 0.1s upto 10s and 1 sec above is available if the above is set to 'Yes',
determines the delay before an automatic restart is performed.
Overvoltage Alarm
This setting range 100-120% in steps of 1%, with a default setting of 115% of line voltage determines the pick up
voltage for the Overvoltage alarm function. When the measured voltage reaches this level and remains for 1 second an
alarm will occur.
Overvoltage Trip
This setting range 100-120% in steps of 1%, with a default setting of 120% of line voltage determines the pick up
level for the Overvoltage trip function. When the measured voltage reaches this level and is maintained for the
Overvoltage Trip Delay a trip will occur.
Overvoltage Trip Delay
This setting range 1-100 seconds in steps of 1 second, with a default setting of 1 second determines how long an
Overvoltage must be present before a trip will occur.
9.4. Current Settings
Maximum Start Time
This setting with a range of 1 to 250 seconds in steps of 1s. Default Setting 10 seconds determines the time that the
motor is allowed to take to complete it's starting sequence.
Number of Starts
The number of starts the motor will make can be limited by the from anywhere between the range of 1 to
10 in steps of 1, with a default setting of 10.
Start Period
This specifies the time, within which the number of motor starts will be allowed to occur. Should the number of starts
selected be exceeded the motor will be inhibited from starting for a pre-selected time specified by the Start Inhibit
Time value. The Start Period can be between the range of 1 to 60 minutes in steps of 1 minute with a default setting of
30 minutes.
Start Inhibit Time
This details the time that must elapse before the motor can be restarted after previously exceeding the number of starts
set within the start period. This is adjustable between the range of 1 and 60 minutes in steps of 1 minute, with a default
setting of 15 minutes.
Summary of Contents for MPC2000+
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