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Troubleshooting
Bit
Description Value=[
no.
0]
30
Reserved
31
Reserved
Table 9.3 POWERLINK Bits
9.1.3 Warning 34 Appears even though
Communication is Established
If the master is in stop mode, Warning 34 appears. Check
that the master is in run mode. If the frequency converter
is not in operational state Warning 34 will appear (60 s
after power up or immediately if the frequency converter
has been in operational state).
9.1.4 Frequency Converter Does Not
Respond to Control Signals
Check 1: Is the Control word valid?
If bit 10=0 in the Control word, the frequency converter
does not accept the Control word.
Check 2: Is the relationship between bits in the Control
word and the terminal I/Os correct?
Check the logical relationship in the frequency converter.
Define the desired logical relationship in 8-50 Coasting
Select to 8-56 Preset Reference Select according to the
following range of options. Select the FC control mode,
digital input and/or serial communication, using
8-50 Coasting Select to 8-56 Preset Reference Select.
If 8-01 Control Site is set to digital only, then the frequency
converter will not react on commands send via the control
word.
Table 9.4 to Table 9.11 show a coast command's effect
upon the frequency converter for the full range of
8-50 Coasting Select settings.
The effect of control mode upon the function of
8-50 Coasting Select, 8-51 Quick Stop Select, and 8-52 DC
Brake Select is as follows:
If [0] Digital input is selected, the terminals control the
Coast and DC Brake functions.
NOTE
Coasting, Quick Stop, and DC brake functions are active for
logic 0.
MCA 123 POWERLINK Operating Instructions
Value=[1]
Comment
Value shall be
read as 0
Value shall be
read as 0
®
MG92C102 - VLT
is a registered Danfoss trademark
Terminal
Bit 02/03/04
Function
0
0
Coast/DC brake/Q-Stop
0
1
Coast/DC brake/Q-Stop
1
0
No Coast/DC brake/Q-Stop
1
1
No Coast/DC brake/Q-Stop
Table 9.4 [0] Digital Input
If [1] Serial communication is selected, commands are
activated only when given via serial communication.
Terminal
Bit 02/03/04
Function
0
0
Coast/DC brake/Q-Stop
0
1
No Coast/DC brake/Q-Stop
1
0
Coast/DC brake/Q-Stop
1
1
No Coast/DC brake/Q-Stop
Table 9.5 [1] Serial Communication
If [2] Logic AND is selected, both signals must be activated
to perform the function.
Terminal
Bit 02/03/04
Function
0
0
Coast/DC brake/Q-Stop
0
1
No Coast/DC brake/Q-Stop
1
0
No Coast/DC brake/Q-Stop
1
1
No Coast/DC brake/Q-Stop
Table 9.6 [2] Logic AND
If [3] Logic OR is selected, activation of one signal activates
the function.
Terminal
Bit 02/03/04
Function
0
0
Coast/DC brake/Q-Stop
0
1
Coast/DC brake/Q-Stop
1
0
Coast/DC brake/Q-Stop
1
1
No Coast/DC brake/Q-Stop
Table 9.7 [3] Logic OR
The effect of control mode upon the function of 8-53 Start
Select and 8-54 Reversing Select:
If [0] Digital input is selected, the terminals control the start
and reversing functions
Terminal
Bit 06/15
Function
0
0
Stop/Anti-clockwise
0
1
Stop/Anti-clockwise
1
0
Start/Clockwise
1
1
Start/Clockwise
Table 9.8 [0] Digital input
9
9
47
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