Stop Mode; Mains Loss Ride Through - Emerson Mentor MP Advanced User's Manual

Parameter
Menu 6
structure
6.01

Stop mode

Bit SP FI
Coding
Range 0 to 2
Default 1
Update rate Background read
Only one stopping phase exists and the ready state is entered as soon as the single stopping action is complete.It should be noted that the stop
condition is detected when the speed feedback is below the zero speed threshold (Pr 3.05) for at least 16 ms. If the speed is not stable it is possible
that the stop condition is not detected. In this case the system should be made more stable or the zero speed threshold should be raised.
Stopping Mode
0: Coast
1: Ramp
2: No ramp
If coast stop is selected the inverter is inhibited immediately when the run command is removed. If however, hold zero speed is also selected (Pr
6.08 = 1), then the drive will be re-enabled to hold zero speed. The result is that the drive is disabled for one sample and then enabled to ramp the
motor to a stop. Therefore if coast stop is required Pr 6.08 should be set to zero to disable hold zero speed.
If stop with ramp is selected the relevant ramp rate is used to stop the motor even if Pr 2.02 is set to zero to disable ramps.
The motor can be stopped with position orientation after stopping. This mode is selected with the position controller mode (Pr 13.10). When this mode
is selected Pr 6.01 has no effect.
6.03

Mains loss ride through

Bit SP FI
Coding
Range 0 to 2 (diS, StoP, ridEth)
Default 0
Update rate Background read
The length of time that the software can keep running after power loss will depend on the AC level before the power was lost. On a 220 V supply, the
ride through ability will be very short.
In mode 0 (dis)
• An auxiliary supply failure takes priority over an SL trip.
• Following an auxiliary supply failure:
The drive trips UU and Solutions Modules are informed. The drive will use the external 24 V supply if connected, the fan/s are stopped, and a power
down save is performed.
• If the line supply is lost and the auxiliary supply is good, the drive will trip supply loss SL and firing of the thyristors will suspend approximately 50 ms
later.
In mode 1 (StoP):
• The auxiliary supply failure and SL trip are independent.
• Following an auxiliary supply failure:
The drive trips UU and Solutions Modules are informed. The drive will use the external 24 V supply if connected, the fan/s are stopped, and a power
down save is performed.
• If the line supply is lost and the auxiliary supply is good the drive will trip supply loss SL and firing of the thyristors will suspend within 10 ms of the
line supply being lost.
In mode 1 (ridEth):
• The auxiliary supply failure and SL trip are independent.
• Following an auxiliary supply failure:
The drive does not trip and show 'rdy'. Solutions Modules are informed. The drive will use the external 24 V supply if connected, the fan/s are
stopped, and a power down save is performed.
When the auxiliary supply is re-applied, the drive is preloaded with 'catch a spinning motor' mode.
• If the line supply is lost and the auxiliary supply is good, the drive goes into 'rdy' state. Firing of the thyristors will suspend within 10 ms of the line
supply being lost. When the supply is re-applied the drive is preloaded with 'catch a spinning motor' mode.
98
Keypad and
DE Txt VM DP ND RA
1
Action
Inhibits the drive
Stop with ramp
Stop with no ramp
DE Txt VM DP ND RA
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Advanced parameter
format
descriptions
Parameter description
NC NV PT US RW BU
1 1 1
NC NV PT US RW BU
1 1
Serial comms
protocol
PS
PS
Mentor MP Advanced User Guide
Issue Number: 4
Performance