Table of Contents
Advertisement
CHAPTER 6: SETPOINTS
339 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
ACCELERATION TIMER
Range: 1.0 to 250.0 s in steps of 0.1 s
Default: 10 s
In single-speed motor applications, sets the maximum acceleration time before tripping.
In two speed motor applications, sets the maximum acceleration time before tripping
when low speed starting from a stopped condition.
OUTPUT RELAY 4 to 6 / OUTPUT RELAY 5 to 6
Range: Do Not Operate, Operate
Default: Do Not Operate
Any assignable output relay can be selected to operate upon Acceleration Trip
operation. When the SWITCHING DEVICE is selected as BREAKER, the assignable output
relays will be Output Relay 4 to 6. When the SWITCHING DEVICE is selected as
CONTACTOR, the assignable output relays will be Output Relay 5 to 6.
BLOCK 1 to 3
Range: Off, Contact Input 1 to 10, Virtual Input 1 to 32, Remote Input 1 to 32, Logic
Element 1 to 16
Default: Off
Three blocking inputs are provided for the Acceleration feature. When any of the
selected blocking inputs is ON, the Acceleration function is blocked.
TWO-SPEED MOTOR APPLICATION
PATH:
SETPOINTS > S3 PROTECTION > TWO SPEED MOTOR > HIGH SPEED ACCEL T
ACCEL T ON STOPPED
Range: 1.0 to 250.0 s in steps of 0.1 s
Default: 10.0 s
When a two-speed motor starts directly at high speed, this setting specifies the
maximum acceleration time before tripping.
ACCEL T ON LOW SPD
Range: 1.0 to 250.0 s in steps of 0.1 s
Default: 10.0 s
When a two-speed motor is switched from a low-to-high speed, this setting specifies the
maximum acceleration time before tripping.
S3 PROTECTION
6–109
Advertisement
Table of Contents
