22
IA VRD UK.INDD RH 02.06
Digital Power Amplifier
Series VRD350 and VRD355
Installation Manual
Parker Hannifin GmbH & Co. KG
Hydraulic Controls Division
Conversion factors for controller parameters:
Display
P16
With E2 = 1, 2, 4:
0...255
P-portion (K
P,2
)
for control deviation
>
threshold (P15)
With E2 = 3:
0...255
P-portion of PID-controller (K
P
)
P17 I-portion
0...255
P18 D-portion
0...255
P19 T-portion of DT1-element
0...255
(affects P18)
P20 Gain for actual value input
0.00...2.00
Parameter for comparator function and remote
loop control:
With P21 and P22 = 0.00 the comparator is
switched off.
Display
P21
Comparator value
0.00...9.99V
(positive)
P22 Comparator value
0.00...9.99V
(negative)
P23 Time for switch-on delay
0.00...9.96s
P24 Time for switch-off delay
0.00...9.96s
With E14 = 0 or 1
K
P13
= [P13] / 64
With E14
≥
2
K
P13
= [P13] / 64 * E14
With E14 = 0 or 1
K
P16
= [P16] / 64
With E14
≥
2
K
P16
= [P16] / 64 * E14
With E2 = 3
K
P13
= [P13] / 255
K
I
([P17] / 1024) / 0.75ms
K
D
([P18] / 16) * 0.75ms
E-Parameters (Extended Parameters)
For general setup of the amplifier which does not
have to be altered during normal operation. The
E-parameters are factory preset. Any changes
have no effect before the values have been stored
using the E-key.
Display
E1 Reserved
E2 Closed loop control
(only with boards for closed loop systems)
• not active
0
• active
1
• remote loop control
2
• bypass control
3
• safety function active (only with E14 = 1)
4
E3 Solenoid type
3.5A / (9V) / solenoid coil = 1.8
Ω
1
reserved
2
2.7A / (9V) / solenoid coil = 2.1
Ω
3
reserved
4
0.8A / (24V) / solenoid coil = 21
Ω
5
reserved
6
2.7A / (9V) / solenoid coil = 2.1
Ω
7
(only for RLL valves)
E4 P-portion current controller
0...255
energisation
E5 I-portion current controller
0...255
energisation
E6 P-portion current controller
0...255
de-energisation
E7 I-portion current controller
0...255
de-energisation
E8 Ramp change
(for value alteration use S-parameters)
• constant rise rate
1
• constant time rate (only valid for in-
0
ternal set values 1...4)
E9 Time delay for enable signal
0.0...9.96s
(0...10s)
E10 Reserved
E11 Type of feedback transducer
(only with boards for closed loop systems)
7.5V ± 2V (E12 = 1 possible)
1
4...20mA (E12 = 1 possible)
2
0...20mA
3
0...10V
4
6V ±2V (E12 = 1 possible)
5
0V ±10V
6
4...20mA (E12 = 1 possible)
7
0...20mA
8
0...10V
9
7.5V ±4.5V (E12 = 1 possible)
10*
* or specific customer setting. Please direct inquires to the
manufacturer. Type 1 to 6 for control circuits with directional
valves (U13 can be positive or negative). Type 7, 8 and 9 for
control circuits with pressure regulating valves (U13 only
≥
0). Depending on the selection E12 is automatically set,
however, this can be manually overridden.
With E2 = 2 (remote loop control), P21
and P22 have a different interpreta-
tion.
