GE Industrial Solutions AF-650 GP DeviceNet - Manual (Page 21)

Example:
par. P-06 Base Speed = 1420 RPM
par. F-04 Base Frequency = 50 Hz
par. F-53 Maximum Reference = 1420 RPM
In order to run the motor at 25%, the reference transmitted must be: (1420*0,25) = 355 = 163hex
163hex => 25% => Fout = 12,5Hz
4.4.4 Actual Output Speed under Instances 20/70 and 21/71
The value of the actual speed of the motor is transmitted in the form of a 16-bit word. The value is transmitted as a whole number. Negative figures are formed
by means of 2s complement.
The actual speed value has the following format:
-32767 (8000 Hex) [RPM] -> +32767 [RPM] (7FFF Hex) [RPM]
4.5 GE Drive Control Profile
4.5.1 Control Word under Instances 100/150, 101/151 and 102/152
To select GE drive protocol in the control word, par. O-10 Control Word Pro-
file must be set to Drive protocol [0]. The control word is used to send
commands from a master (PLC or PC) to a slave (frequency converter).
The control words in Instances 100/101/102 are defined as follows to the
right:
Bit Bit value = 0 Bit value = 1
00 Reference value External selection lsb
01 Reference value External selection msb
02 DC brake Ramp
03 Coasting No coasting
04 Quick stop Ramp
05 Hold output frequency Use ramp
06 Ramp stop Start
07 No function Reset
08 No function Jog
09 Ramp 1 Ramp 2
10 Data invalid Data valid
11 No function Relay 01 active
12 No function Relay 04 active
13 Parameter set-up Selection lsb
14 Parameter set-up Selection msb
15 No function Reverse
Explanation of the Control Bits:
Bits 00/01
Bits 00 and 01 are used to choose between the four reference values, which are pre-programmed in par. C-05 Multi-step Frequency 1 - 8 according to the table
to the right:
AF-600FP /650 GP DeviceNet Operating Instructions
20
4