Process Words (Pcd); Examples; Writing A Parameter Value; Reading A Parameter Value - Danfoss VLT FC 102 Series Design Manual

Installation and Set-up
Conversion index
100
75
74
67
6
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
-7
Table 8.9 Conversion Table

8.4.13 Process Words (PCD)

The block of process words is divided into two blocks of
16 bits, which always occur in the defined sequence.
PCD 1
Control message (master ⇒ follower control
word)
Control message (follower ⇒ master) status
word
Table 8.10 Process Words (PCD)
MG11BC22
Design Guide
Conversion factor
1000000
100000
10000
1000
100
10
1
0.1
0.01
0.001
0.0001
0.00001
0.000001
0.0000001
PCD 2
Reference value
Present output
frequency
Danfoss A/S © Rev. 06/2014 All rights reserved.

8.5 Examples

8.5.1 Writing a Parameter Value

Change 4-14 Motor Speed High Limit [Hz] to 100 Hz.
Write the data in EEPROM.
PKE = E19E Hex - Write single word in 4-14 Motor Speed
High Limit [Hz]
IND = 0000 Hex
PWEHIGH = 0000 Hex
PWELOW = 03E8 Hex - Data value 1000, corresponding to
100 Hz, see chapter 8.4.12 Conversion.
The message looks like this:
E19E H 0000 H 0000
PKE IND PWE
Figure 8.12 Write Data in EEPROM
NOTICE!
4-14 Motor Speed High Limit [Hz] is a single word, and the
parameter command for write in EEPROM is "E".
Parameter number 4-14 is 19E in hexadecimal.
The response from the follower to the master is:
119E H 0000 H 0000
PWE
IND
PKE
Figure 8.13 Response from Follower

8.5.2 Reading a Parameter Value

Read the value in 3-41 Ramp 1 Ramp-up Time
PKE = 1155 Hex - Read parameter value in 3-41 Ramp 1
Ramp-up Time
IND = 0000 Hex
PWEHIGH = 0000 Hex
PWELOW = 0000 Hex
1155 H 0000 H 0000
PKE IND
Figure 8.14 Parameter Value
H 03E8 H
PWE
high low
H 03E8 H
PWE
low
high
H 0000 H
PWE PWE
high low
153
8 8