GE Industrial Solutions DV-300 DC Drive Users Manual - Manual (Page 229)

DV-300 Adjustable Speed Drives
——— FUNCTION DESCRIPTION ———
6
101
100% (Overload current 2 x Overload time)
• If Motor I2t ovrld is set to Activity = Warning,
the current is maintained at Overload current parameter value
also when Motor I2t accum = 100% (Overload current 2 x
Overload time)
n
ote
! Motor I2t accum is equal to 100% if (Overload current 2 x Overload time) is reached but
in any case the limit maximum is [(150% FLC)2 x 60 sec]
I2t Drive The current is limited to T current lim (+/-) value until
Drive I2t accum = 100% i.e. equal to [(150% Derated Drive
Current (*) ) 2 x 60 sec]. When this value is reached, the drive is
disabled.
I2t Motor & Drv The current is limited to T current lim (+/-) value until reaching
Drive I2t accum = 100% [(150% Derated Drive Current (*) ) 2 x
60 sec] if Motor I2t ovrld Activity is set to Warning & Ignore
or, If set to Disable drive until reaching Motor I2t accum =
100% (Overload current 2 x Overload time).
(*) Derated Drive Current:
If using the drive with Standard sizes (Size selection = Standard) the Derated Drive Current is
calculated as follows:
• Derated Drive Current = Drive size x Derating_fact (see table below)
If using the drive with American sizes (Size selection = American) the Derated Drive Current is
calculated as follows:
• Derated Drive Current = Drive size.
The motor overload function is designed to allow the current selected with Overload
Current for a time equal to Overload Time.
(I load² - I ovld²)*ts[sec] = ((Over Curr / 100)² - 1²)*I Flc² * (Overload time)
I flc = full load current
The motor overload function gives the possibility to have 1.5 the Overload current for 60 sec.
If the threshold is higher than the value is limited to:
(I load² - I Flc²)*ts[sec] = (1.5² - 1²)*I Flc² * 60
The Motor ovrld preal. is available on digital output (code 65), it is 1 with Motor I2t
accum = 90 % and 0 when Motor I2t accum = 0.
The Overld available signal is available on digital output (code 6), it is 0 with Motor
I2t accum = 100 % and 1 with Motor I2t accum 0.
The Drive ovrld preal. is available on digital output (code 66), it is 1 with Drive I2t
accum = 90 % and 0 when Drive I2t accum = 0.
The Overld available signal is available on digital output (code 67), it is 0 with Drive
I2t accum = 100 % and 1 with Drive I2t accum 0.