14.5
Diagnosis
14.5.1
Warnings
Warnings of the DRn function are displayed in the parameters D0.86 and
D0.87 according to the following tables. When a warning occurs, the display
shows "APE1" in every case. The value in the "Code" column can be exam‐
ined from D0.86 and D0.87 to find out which warning occurred.
A warning can occur when DRn is already driving the motor. As long there is
a warning in the queue you can operate. But its recommended to stop the
function and clear the warning.
Bit
Code
Condition
Reason
Solution
0
1
F3.23 < F3.21
Speed boost ramp pitch is smaller
than speed adaptation ramp pitch
(ascending)
Either set F3.23 higher or F3.21
smaller
1
2
F3.21 = 0
Speed adaptation ramp pitch (as‐
cending) 0 impedes speed adapta‐
tion
Configure F3.21 to be greater than
zero
2
4
F3.22 = 0
Speed adaptation ramp pitch (de‐
scending) 0 impedes speed adap‐
tation
Configure F3.22 to be smaller than
zero
3
8
F3.23 = 0
Speed boost ramp pitch 0 impedes
boost function
Set F3.23 greater than zero and
greater than F3.21
4
16
F3.24 = 0
Speed boost pressure window 0
causes permanently active boost
function
Widen the boost pressure window
F3.24 to values greater than 0 and
greater than the noise of the pres‐
sure sensor
5
32
F3.24 < 1
Narrow speed boost pressure win‐
dow can cause boost function to
cyclically start
Widen the boost pressure window
F3.24 to values greater than 0 and
greater than the noise of the pres‐
sure sensor. A good value to start
is 5 bar
6
64
F3.21 > F4.50
Speed adaptation ramp pitch (as‐
cending) exceeds maximum pump
angular acceleration
Reduce F3.21 to values that are
smaller than the maximal angular
acceleration of the pump
7
128
|F3.22| > F4.50
Speed adaptation ramp pitch (de‐
scending) exceeds maximum pump
angular acceleration
Reduce the absolute value of F3.22
(which must be negative) to values
that are smaller than the maximal
angular acceleration of the pump
8
256
F3.23 > F4.50
Speed boost ramp pitch exceeds
maximum pump angular accelera‐
tion
Reduce F3.23 to values that are
smaller than the maximal angular
acceleration of the pump
11
2048
F3.19 < F4.52
Speed adaptation minimum speed
is lower than minimum pump speed
Reduce F3.23 to values that are
smaller than the maximal angular
acceleration of the pump
12
4096
F3.20 > F4.51
Speed adaptation maximum speed
exceeds maximum pump speed
Lower F3.20 to values that are un‐
der the maximal speed of the pump
DOK-SYTROX-DRN5020****-IT05-EN-P
Bosch Rexroth AG
133/143
Frequency-Controlled Pump Drive System Sytronix DRn 5020
Troubleshooting
