Bosch Rexroth VT-VSPA1-1 User manual

1/12
Electrical amplifiers
Type VT-VSPA1-1 and VT-VSPA1K-1
Component series 1X
RE 30111/09.05
Replaces: 02.03
Table of contents
Contents Pa e
Features 1
Ordering code 2
Functional description 2 and 3
Bloc circuit diagram / pin assignment VT-VSPA1-1 4
Bloc circuit diagram / pin assignment VT-VSPA1K-1 5
Technical data 6
Output characteristic curves 7
Indicator / adjustment elements 8 and 9
Meaning of DIL switches 10
Unit dimensions 11
Engineering / maintenance notes / supplementary in for ma tio n 11
Troubleshooting 12
Features
– Suitable for controlling all direct and pilot operated proportion-
al pressure control valves without electrical position feedbac
and only one solenoid as actuator that are available at the time
of publication of this data sheet
– Differential input, can be switched between voltage and cur-
rent input
– Additional command value input, 0 to +9 V
–
Ramp generator, can be adjusted separately for up and down ramps
– Cloc ed output stage
– Signal "ready for operation" (VT-VSPA1K-1 only with LED
indicator lamp)
– Reverse polarity protection for voltage supply
– Cable brea detection of current input 4 to 20 mA
– Short-circuit protection of solenoid cable
– Cable brea detection of solenoid cable
H5897_d
Suitable card holders for VT-VSPA1-1:
– Type VT 3002-2X/32, see RE 29928
Single card holder without power supply unit
Suitable power supply unit:
– Type VT-NE30-1X, see RE 29929
Compact power supply unit 115/230 VAC → 24 VDC, 108 W

5K
12(ac)
10(ac)
14(ac)
18(ac)
12(ac)
10(ac)
28(ac)
30(ac)
u (i)
u
2/12 Bosch Rexroth AG Hydraulics VT-VSPA1-1 and VT-VSPA1K-1 RE 30111/09.05
Orderin code
Amplifiers for controlled proportional pressure
control valves, analogue, with one solenoid
With 32-pin male connector and front panel = No code
With 16-pin terminal strip; without front panel = K
Further details in clear text
1X = Component series 10 to 19
(10 to 19: unchanged technical data and pin
assignment)
VT-VSPA1 1 1X *
For substitutes for amplifier types VT 2000 (up to
component series 4X), VT 2010, VT 2013 or VT 2023
for rac installation, blind plate 4TE/3HE must be or-
dered separately. Material no. R900021004
Functional description
The command value voltage is applied to command value input
1 either directly or via an external command value potentiometer
with
the help of the regulated + 9V voltage from the power supply
unit [14].
The following is valid for this input: +9 V +100 % 1).
External command value feedforward
Input 1
+9 V
M0
Note:
When an external command value potentiometer is used, in-
ter nal potentiometer "Gw" [3] must be set to maximum or the
required maximum pressure.
Input 1
+9 V
Differential input (input 2)
0 to +10 V / 4 to 20 mA
0 to 20 mA
0V reference potential
Additions to the pin desi nati-
ons in brackets are only valid
for type VT-VSPA1-1.
Command value input 2 is a differential input [1] (0 to + 10 V).
With the help of DIL switches 2) it can be confi gured as cur-
rent input (4 to 20 mA or 0 to + 20 mA). If the command value
is fed forward by external electronics with a different reference
potential (e.g. by a PLC), this input must be used. When the
command value voltage is applied or withdrawn, care must be
ta en that both signal cables are disconnected from or con-
nected to the input.
Before being passed on, both command values are summated
[2] and then fed to a potentiometer [3] that is accessible on
the front pan el and acts as attenuator and limits the maximum
com mand value.
The downstream ramp generator [4] generates a ramp-shaped
out put signal from a stepped input signal. The time constant
of this signal can be adjusted separately for “up” and “down”
ramps with the help of two potentiometers. The specifi ed ramp
time refers to a command value step-change of 100% and can
be approx. 1 s or 5 s, depending on the setting of a DIL switch
2)
.
If a command value step-change of less than 100 % is fed to
the input of the ramp generator or when attenuator [3] is effec-
tive, the ramp time shortens ac cord ing ly
The following is valid for type VT-VSPA1-1: The up and down
ramp times can be set separately to their minimum value (ap-
prox. 30 ms) with the help of the external contacts “ramp up/
down OFF”.
The following is valid for type VT-VSPA1K-1: The up and down
ramp times can be set collectively to their minimum value (ap-
prox. 30 ms) with the help of the external contact “ramp OFF”.
Internal command value feedforward

4ac
2c
2a
4
2
Hydraulics Bosch Rexroth AG
RE 30111/09.05 VT-VSPA1-1 and VT-VSPA1K-1 3/12
Ramp "up/down" OFF
VT-VSPA1-1
Ramp "up" OFF
Ramp "down" OFF
VT-VSPA1K-1
Ramp OFF
The output signal of ramp generator [4] is fed as current com-
mand value to the summing amplifier [5]. Here, a command val-
ue of 100 % corresponds to a voltage of +6 V.
Functional description (continued)
Summing amplifi er [5] adds the output signals of the char ac -
ter is tic curve generators [6 or 7] to the command value (can
be se lect ed by means of DIL switches 2) depending on the
valve to be controlled). The current command value can also be
fi ltered through a low-pass fi lter that can be cut in. Current out-
put stage [9] is controlled via current regulator [8]. In addition,
the current regulator mod u lates the current command value
with cloc -pulse encoder signal [10] (the frequency can be pro-
grammed with the help of DIL switches 2)). The cloc ed actual
current value acts in the solenoid of the valve li e a constant
current with overlaid dither signal. Type VT-VSPA1-1 is pro-
vid ed with measuring soc ets for the internal command value
and the actual value.
The following is valid for the command value: +6 V 100 %
The following is valid for the actual value: 1 mV 1 mA
The signal "ready for operation" is output and LED "H2" on the
front panel (with VSPA1-1) or LED "H2" (with VSPA1K-1) is lit,
when:
– The solenoid cables are not short-circuited and the output
stage is not overloaded,
– a command value is applied (cable brea detection),
– there is no cable brea present on the solenoid cable.
1) Reference potential for command value 1 is M0 (measuring
zero).
2) For
DIL switch settings, see "adjustment elements" on page 8
[ ] … Cross-reference to bloc circuit diagrams on pages 4
and 5

u
i
2,5 A T
2 x 220 µF
U/I
U
1
23
12
14
13
10
11
15
4
5
8
9
32ac 22ac
20ac
26a
14ac
24ac
18ac
16ac
14ac
6ac
8ac
10ac
30ac
28ac
12ac
+ 24 V
M0 (25 mA)
+ 9 V (25 mA)
0 V
– 9 V (25 mA)
S1 1 S1 3 S1 4
Gw
H2
&
DC
Zw (R130)
S2 5 S2 7
S1 7
S1 5
S1 6
16
S2 3 / S2 4
4ac 2c 2a
17
+ 24 V 26c
DC
Σ
t t
Σ
6 7
Σ⬃
4/12 Bosch Rexroth AG Hydraulics VT-VSPA1-1 and VT-VSPA1K-1 RE 30111/09.05
Block circuit dia ram / pin assi nment: VT-VSPA1-1
Command
value "w"
Ready for operation 24 V (50 mA)
Command value
2
+10 V
4 - 20 mA / 0 - 20 mA
GND ⊥
Command value 1
Act. current value 1 mV 1 mA
Note: Measurin zero (M0) is raised by 9 V as a ainst 0V operatin volta e!
Comm. value 0 to 6 V
Actual current value
"I"
ISoll
S1.7 off on
Imax 1.6 A 0.8 A
f–3dB S2.3 S2.4
0 off off
2,5 Hz off on
4 Hz on off
fcloc S2.5 S2.6 S2.7
100 Hz on on on
200 Hz off on on 300 Hz off off on
Comm. value 2
S1.1 S1.2 S1.3
0…10 V off off off
0…20 mA on on off 4…20 mA on on on
S1.4 on off
tmax 5 s 1 s
Char. curve 1
Char. curve 2
Ramp "up" OFF Ramp "down"
OFF
1Differential input 2; 5; 15
Summator
3Max. command value attenuator 4Ramp generator 6
Characteristic curve generator
1
7
Characteristic curve generator 2
8Current regulator 9Current output stage 10 Cloc -pulse generator 11
Proportional solenoid of valve
12 Command value monitoring
13 Monitors 14 Power supply unit 16 Low-pass filter 17 Output “ready for operation“
H2 = Signal “ready for operation“ Gw = Command value attenuation t= Ramp time adjustment Zw (R130)
=
Additional biasing current adjustment
(0 to 300 mA or 0 to 600 mA)

u
i
2,5 A T
2 x 220 µF
U/I
U
1
23
12
14
13
10
11
15
4
5
8
9
32 22
20 26
14
24 18
16
14
6 8
10
30
28
12
+ 24 V
M0 (25 mA)
+ 9 V (25 mA)
0 V
– 9 V (25 mA)
S1 1 S1 3 S1 4
Gw
H2
&
DC
Zw (R130)
S2 5 S2 7
S1 7
S1 5
S1 6
16
S2 3 / S2 4
4 2
DC
Σ
t t
Σ
6 7
Σ⬃
Hydraulics Bosch Rexroth AG
RE 30111/09.05 VT-VSPA1-1 and VT-VSPA1K-1 5/12
Block circuit dia ram / pin assi nment: VT-VSPA1K-1
Ramp OFF
Command value 1
Act. current value 1 mV 1 mA
Note: Measurin zero (M0) is raised by 9 V as a ainst 0V operatin volta e!
Comm. value output 0 to 6 V
S1.7 off on
Imax 1.6 A 0.8 A
f–3dB S2.3 S2.4
0 off off
2,5 Hz off on
4 Hz on off
fclock S2.5 S2.6 S2.7
100 Hz on on on
200 Hz off on on 300 Hz off off on
Comm. value 2
S1.1 S1.2 S1.3
0…10 V off off off
0…20 mA on on off 4…20 mA on on on
S1.4 on off
tmax 5 s 1 s
ISoll
1Differential input 2; 5; 15 Summator 3Max. command value attenuator 4Ramp generator 6
Characteristic curve generator
1
7
Characteristic curve generator
2
8Current regulator 9Current output stage 10 Cloc -pulse generator 11 Proportional solenoid of valve
12 Command value monitoring 13 Monitors 14 Power supply unit
16 Low-pass filter H2 = Signal “ready for operation“
Gw = Command value attenuation t= Ramp time adjustment Zw (R130)
=
Additional biasing current adjustment
(0 to 300 mA or 0 to 600 mA)
Command value 2 +10 V
4 - 20 mA / 0 - 20 mA
GND ⊥

6/12 Bosch Rexroth AG Hydraulics VT-VSPA1-1 and VT-VSPA1K-1 RE 30111/09.05
Technical data (for applications outside these parameters, please consult us!)
1) The maximum current Imax can be set to the required value by
means of command value attenuator potentionmeter “Gw“.
Operating voltage UO+24 VDC +40 % –5 %
Operating range:
– Upper limit value uO(t)max +35 V
– Lower limit value uO(t)min +22 V
Max. power consumption Ps 50 VA
Max. current consumption I1.8 A
Fuse Is2.5 A T
Inputs:
– Command value 1 Ui0 to +9 V (reference potential is M0)
– Command value 2 (differential input) Ui0 to +10 V; Ri = 100 Ωdepending on setting
with S11 to S13
or Ii4 to 20 mA (load RL = 100 Ω)
or Ii0 to 20 mA (load RL = 100 Ω)
Ramp time (adjustment range) t30 ms to approx. 1 s or 5 s (depending on setting with S14)
Outputs:
– Output stage
• Solenoid current/resistance Imax 800 mA +20 %, R20 = 19,5 Ωdepending on setting
with S17 1)
or Imax 1600 mA +20 %, R20 = 5,4 Ω
•
Biasing current at Imax = 800 mA Ib50 mA or 100 mA
depending on setting with
S17 and “Zw“ (R130)
at Imax = 1600 mA Ib100 mA
additionally at Imax = 800 mA Ib0 to 300 mA +20 %
Adjustable by means of “Zw“
(R130) on the printed-circuit board
at Imax = 1600 mA Ib0 to 600 mA +20 %
• Cloc frequency f100 Hz, 200 Hz, 300 Hz or 370 Hz ±10 % each
(depending on setting with S25 to S27)
– Signal “ready for operation“ (only with VT-SPA1-1)
• Component series 10
when ready for operation
U approx. UO
in the case of a fault U< 1 V
•
From component series 11 when ready for operation
Uapprox. UO, 50 mA Load resistance > 10 Ω
in the case of a fault U0 V Ri = 10 Ω
– Regulated voltage U±9 V ±1 %, ±25 mA externally laodable
– Measuring soc ets
• Command value “w“ U 0 to +6 V (+6 V 100 % solenoid current), Ri = 1 Ω
• Actual current value “I“ U 0 to 1600 mV 0 to 1600 mA ±20 mA
Type of connection:
– VT-VSPA1-1 32-pin male connector, DIN 41612, form D
– VT-VSPA1K-1 16-pin terminal strip
Card dimensions: Euro-card 100 x 160 mm, DIN 41494
Front panel dimensions
– Height 3 HE (128.4 mm)
– Width soldering side 1 TE (5.08)
– Width component side 3 TE
Permissible operating temperature range ϑ0 to +50 °C
Storage temperature range ϑ–25 to +85 °C
Weight m0.1 g

1600 800
1200 600
800 400
600 300
400 200
200 100
00
050 100
A
I1
I2
050 100
1
2
I2
IV
1600 800
1200 600
800 400
400 200
200 100
100 50
00
Hydraulics Bosch Rexroth AG
RE 30111/09.05 VT-VSPA1-1 and VT-VSPA1K-1 7/12
Output characteristic curves
Command value in % →
Output current in mA →
Linear output characteristic curve (basic characteristic curve)
I1 Adjustment range of biasing current Ib by means
of potentiometer "Zw" (R130) on the printed-cir-
cuit board
I2 Adjustment range of maximum command value by
means of po ten tio me ter "Gw"
ACharacteristic curve with factory setting
Command value in % →
Output current in mA →
Iv
Biasing current curve 2 (qualitative representation)
I2 Adjustment range of maximum command value by
means of po ten tio me ter "Gw"
1Characteristic curve 1 (qualitative
representation )
2Characteristic curve 2 (qualitative
representation )
Output characteristic curve with firmly set characteristics
(see adjustment instructions on pages 8 and 9)

X1
R130
BR11 BR17
BR21 BR27
Gw
w
I
F2
2,5 A MT
1 2 3 4 5 6 7
ON
1 2 3 4 5 6 7
H2
t
t
ON
F2
2,5 A T
Zw
X1
Gw
w
I
H2
t
t
7
6
5
4
3
2
1
7
6
5
4
3
2
1
X1
2
32
H2
Gw
F2
2,5 A T
Zw
t
t
7
6
5
4
3
2
1
7
6
5
4
3
2
1
8/12 Bosch Rexroth AG Hydraulics VT-VSPA1-1 and VT-VSPA1K-1 RE 30111/09.05
Indicator / adjustment elements
VT-VSPA1-1, component series 10
LED indicator lamp “ready for opera-
tion"
Max. command value (attenuator)
Ramp time “up”
Ramp time “down"
w - Current command value
I - Actual current value
DIL switch roup S1X
Potentiometer for bias-
in current adjustment
DIL switch
roup S2X
Potentiometer for bias-
in current adjustment
DIL switch
roup S2X
DIL switch
roup S1X
VT-VSPA1-1, from component series 11
VT-VSPA1K-1
Max. command value (attenuator)
Ramp time “up"
Ramp time “down"
Potentiometer for bias-
in current adjustment
DIL switch
roup S2X
DIL switch
roup S1X
LED indicator lamp “ready for operation"
(SMD LED)
LED indicator lamp “ready for operation"
Max. command value (attenuator)
Ramp time “up”
Ramp time “down"
w - Current command value
I - Actual current value

Hydraulics Bosch Rexroth AG
RE 30111/09.05 VT-VSPA1-1 and VT-VSPA1K-1 9/12
Indicator / adjustment elements (continued)
Assi nment of DIL switch settin s on the card to the valve
types (see also label on the printed-circuit board)
Meanin of potentiometers "Zw" (R130) and "Gw":
– Adjustment of biasing current by means of potentiometer
"Zw" (R130)
• Turning cloc wise → increase in biasing current
• Turning counter-cloc wise → reduction of biasing current
– Adjustment of the max. command value by means of potenti-
ometer "Gw"
• Turning cloc wise → increase in command value
• Turning counter-cloc wise → reduction of command value
1) Up to component series 5X
ON
1234567
ON
1234567
ON
1234567
ON
1234567
1234567
ON X
1234567
ON X
1234567
ON
X
0 … 20 mA ON
1234567
4 … 20 mA
ON
1234567
Settin for valve
types:
S15 ... S17
(BR15 ... BR17)
S21 ... S27
(BR21 ... BR27)
Settin valid for all
valve types:
S11 ... S14
(BR11 ... BR14)
DBE(M)T, DBE(M)30,
DRE(M)30,
3DRE(M)10 1),
3DRE(M)16 1),
DBEP6A, DBEP6B,
3DREP6A, 3DREP6B,
pumps
DRE(M)10-5X,
DRE(M)20-5X
DBE(M)10-5X,
DBE(M)20-5X,
3DRE(M)10P-6X,
3DRE(M)16P-6X,
ZDRE10, (Z)DBE6
DRE6,
ZDRE6
Ramp time
Command
value 2
Note (X):
With type VT-VSPA1-1 (component series 10) switch BR22
must be set to “ON” and potentiometer “R130” turned to “left-
hand limit stop” before the correct characteristic curve can be
set.
With type VT-VSPA1-1 (from component series 11) and type
VT-VSPA1K-1, switch
S22 is ineffective. Po ten tio me ter "Zw"
needs not to be operated.
5 s
1 s
ON
1234567
ON
1234567
+10 V
ON
1234567

10/12 Bosch Rexroth AG Hydraulics VT-VSPA1-1 and VT-VSPA1K-1 RE 30111/09.05
Meanin of the DIL switches
1) Doubling of the maximum output current doubles the
adjustment range and the set biasing current.
2) For f = 100 Hz, DIL switches S25, S26 and
S27 must be set to the “ON“ position.
3) Up to component series 5X
Adjustment range of biasing current using potentiometer “Zw“
(R130):
Imax = 800 mA → Ib = 0 to 300 mA
Imax = 1600 mA → Ib = 0 to 600 mA
( ) valid for VT-VSPA1-1, component series 10
When switch BR22 is operated, the biasing current increases
by 50 mA or 100 mA.
Note (X):
Before commissioning the amplifiers, ma e sure that the DIL
switches on the printed-circuit board are set according to the
relevant application.
Adjustment options inedependent of the valve type (command value 2 and ramp time)
Switch positions with reference to the current valve types or previous amplifier cards
Switch
Valve types/amplifier cards
DBE(M)T, DBE(M)30
DRE(M)30, DRE(M)10 3)
DRE(M)16 3)
DBEP6A, DBEP6B
3DREP6A, 3DREP6B
pumps
DRE(M)10-5X
DRE(M)20-5X
DBE(M)10-5X
DBE(M)20-5X
ZDRE10
(Z)DBE6
3DRE(M)10P-6X
3DRE(M)16P-6X
DRE, ZDRE6
VT 2000 VT 2010 VT 2013 VT 2023
Characteristic curves
Basic characteristic curve Characteristic curve 1 Characteristic curve 1 Characteristic curve 2
S15 (BR15) OFF ON ON OFF
S16 (BR16) OFF OFF OFF ON
Command value filters
S23 (BR23) f-3dB = 4 Hz f-3dB = 4 Hz f-3dB = 2.5 Hz
S24 (BR24) OFF ON ON OFF
OFF OFF OFF ON
Max. output current 1)
Imax = 800 mA Imax = 800 mA Imax = 1,6 A Imax = 1.6 A
S17 (BR17) ON ON OFF OFF
Clock frequency 2)
f = 200 Hz f = 200 Hz f = 300 Hz f = 370 Hz
S25 (BR25) OFF OFF OFF OFF
S26 (BR26) ON ON OFF OFF
S27(BR27) ON ON ON OFF
Basic biasin current settin
“Zw“ (R130) 100 mA 50 mA 100 mA 100 mA
S11 (BR11)
S12 (BR12)
S13 (BR13)
Confi uration of differential input
Command value 2: +10 V
OFF
OFF
OFF
Command value 2: 0 to 20 mA
ON
ON
OFF
Command value 2: 4 to 20 mA
ON
ON
ON
DRE, ZDRE6
Max. ramp time
S14 (BR14) OFF 1 s ON 5 s
Factory setting (corresponds to the configuration of a VT 2000 amplifier)

Ø 8
2
100
165
182
89
7
3HE (128,4)
VSPA1
4TE
(20)
w
I
Gw
M0
H2
t
t
X1
10
135
100
160
80
4 x Ø 4,5
164
104
10
Hydraulics Bosch Rexroth AG
RE 30111/09.05 VT-VSPA1-1 and VT-VSPA1K-1 11/12
Unit dimensions (nominal dimensions in mm)
VT-VSPA1K-1
VT-VSPA1-1
En ineerin / maintenance notes / supplementary information
– Before commissioning the amplifiers, ma e sure that the DIL switches on the printed-circuit board are set according to the
relevant application.
– The factory setting of the parameters is as follows (for the adjustment of parameters, see pages 8 to 10):
max. ramp time = 5 s, biasing current = 100 mA, max. output current = 800 mA, cloc frequency = 200 Hz
– The amplifier card may only be installed when disconnected from the power supply!
– Do not use plugs with free-wheeling diodes or LED lamps for connecting the solenoids!
– Measurements on the card may only be ta en with instruments Ri > 100 Ω !
– Measuring zero (M0) is raised by +9 V as against 0 V operating voltage and not electrically isolated, i.e. –9 V regulated voltage
0 V operating voltage. For this reason, do not connect measuring zero (M0) to 0 V operating voltage!
– Use relays with gold-plated contacts for passing on command values (small voltages, small currents)!
– Always shield command value cables; connect the shield to ground on the card side and leave the other end open. Connect the
card to ground at terminal 6 or 8. If no system ground is provided, connect 0 V operating voltage.
Recommendation: Also shield solenoid cables!
For solenoid cables of up to 50 m length, use cable type LiYCY 1.5 mm2. For greater lengths, please consult us!
– The distance to aerial lines, radio sources and radar equipment must be at least 1 m!
– Do not lay solenoid and signal cables near power cables!
– Due to the charging current of the smoothing capacitor on the card, fuses must feature slow-blowing characteristics!
Caution! When the differential input is used, both inputs must always be switched on or off simultaneously!
Note! Electrical signals (e.g. signal “ready for operation”) brought out via control electronics must not be used for
switching safety-relevant machine functions!
(See also European standard “Safety requirements for fluid power systems and components - hydraulics“,
EN 928.)

Bosch Rexroth AG
Hydraulics
Zum Eisengießer 1
97816 Lohr am Main, Germany
Phone [phone] / 18-0
Fax [phone] / 18-23 58
[email protected]
www.boschrexroth.de
© This document, as well as the data, specifications and other information
set forth in it, are the exclusive property of Bosch Rexroth AG. It may not be
reproduced or given to third parties without its consent.
The data specified above only serve to describe the product. No state-
ments concerning a certain condition or suitability for a certain application
can be derived from our information. The information given does not
release the user from the obligation of own judgment and verification. It
must be remembered that our products are subject to a natural process of
wear and aging.
12/12 Bosch Rexroth AG Hydraulics VT-VSPA1-1 and VT-VSPA1K-1 RE 30111/09.05
Troubleshootin
If the amplifier cards are not operable, follow the steps below
for troubleshooting:
1. Is the operating voltage applied?
Measurement of contacts 24(ac) against 18 (ac)
2. Fuse on the card defective?
3. Internal ±9 V operating voltage available on the card?
4. When the internal command value potentiometer is used,
is the jumper from 10(ac) to 12(ac) plugged?
5. Is the external potentiometer properly connected?
6. Is the differential input properly connected?
Chec : Reference potential to 30(ac)
0 to +10 V to 28(ac)
7. Is the solenoid properly connected?
When the card is unplugged, a resistance of approx. 20 Ω
to 30 Ω or 5 Ω to 8 Ω, depending on the valve, must be
measurable between contacts 22ac and 20ac.
The additions to the contact designations are only valid for type
VT-VSPA1-1.
Note:
The output stage shuts down in the case of excessive temper-
atures (e.g. caused by overloading). This fault is signalled by
LED "H2" going out!
In the event of a cable brea of the "4 to 20 mA" input, the sig-
nal "ready for operation" is reset and LED "H2" also goes out.
The following is valid from component series 11 onwards:
In the case of a short-circuit or cable brea of the solenoid ca-
ble, the output “ready for operation” is switched and LED "H2"
flashes at a frequency of
0.5 to 2 Hz as soon as the command
value is > 2 %
at the same time.