GE Industrial Solutions DV-300 DC Drive Users Manual - Manual (Page 317)

DV-300 Adjustable Speed Drives
——— FUNCTION DESCRIPTION ———
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Status 3:
The system reaches this status if the command Speed match = 1 and the Start command are given.
Starting from a Stop condition, if these commands are given, the motor speed reference is set with:W refer-
ence = [± Line speed x (Min dia ÷ Roll dia) ± (W gain % * W offset)] x Spd match gain
where W offset is forced to 0 with a ramp time set to Spd match acc.
If during a Status 3 functioning period the command Speed match is set at zero, the Status 4 is forced.
If during a Status 3 functioning period the system receives a Stop command (Start drive = 0), the Status 5
is forced.
Status 4:
The system reaches this status if starting from the Status 3 the command Speed match is set at zero.
It usually happens simultaneously with the cutting and coil change command.
In this status the motor speed reference is set to:
W reference = ± Line speed x (Minimum diameter ÷ Roll diameter) ± ( W gain % + W offset)
all the internal ramp times for the reference calculation are set at zero.
If during a Status 4 functioning period the system receives a Stop command (Start drive = 0), the Status 5
is set at zero.
Status 5:
The system reaches this status through the Status 2, 3, and 4 if it receives a Stop command (Start drive = 0).
It usually happens:
a) after an automatic switching in order to stop the rotating coil.
The speed reference is set at zero with a ramp time set to Spd match dec.
The parameter W offset is immediately set at zero in order to slow down the coil starting from
the present speed
b) After the line stop if the tension has to be removed (in this case the drive has to be disabled).
Anyway, when the speed = 0 has been reached, the system switches automatically to the Status 1.