Gossen MetraWatt P1500, Operating Instructions Manual

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GMC-I Messtechnik GmbH 31
Setting Parameters for Status Signal Outputs
1 The signal outputs can be logically linked using the comparison function. The
comparative values are defined by parameters w1, w2, w3 and w4 from the UI_C_-
SET command. Momentary measured voltage and current values are
compared with these parameters and evaluated.
7.4 Regulating Output Voltage
Function
Output voltage Uout can be set by means of external control
voltage Usu = U(Uext +) – U(Uext –) via control inputs Uext +
(non-inverting) and Uext – (inverting).
• The voltage control input functions as a differential voltage input:
• The following applies with activated analog setpoint
(SEtUP/dPYIF/AnIF/AI_U on):
Uset = USET + ku x U(Uext +) – ku x U(Uext –)
Uset = Resulting output voltage setpoint
USET = Voltage setpoint which has been selected
manually or digitally
U(Uext +) = External control voltage
(0 ... 5 V 0 ... +Usetnom)
with reference to AGND (1)
U(Uext –) = External control voltage
(0 ... 5 V 0 ... –Usetnom)
with reference to AGND (1)
ku =Control coefficient = U
setnom
/ 5 V
U
setnom
= 60 V (SYSKON P1500-060-060)
• Max. adjusting error:
SYSKON P1500:

0.2% Unom

0.6% setting value
SYSKON P3000:

0.25% Unom

0.6% setting value
SYSKON P4500:

0.25% Unom

0.6% setting value.
• Input resistance: 10 k

each
Notes
• The control inputs are not floating inputs: Their reference
point, AGND (1), is connected to the negative pole of the
power output.
• Connecting grounded circuits to the control input may result
in erroneous settings due to leakage current or ground loops.
• If the reference point of control voltage Usu is connected to the
negative output pole at the load side, the inverting input must be
connected to this point (connection b in figure 7.4). Influences
resulting from voltage drops in the output lead are thus avoided.
• If control voltage is isolated from the output, connect Uext – to
AGND (1) (connection a in figure 7.4).
• If remote adjustment of output voltage is to be accomplished
by means of a potentiometer, wiring can be laid out as shown
in figure 7.4.
• Usu can also be applied as an alternating voltage, for example
in order to superimpose manually selected direct voltage
USET with interference signals. The maximum operating
frequency of modulated output voltage depends upon voltage
amplitude, the setting selected for current limiting and load,
and thus cannot be defined with a simple formula. It is
increased as amplitude is decreased, and as current limiting
and load are increased.
Connection
Figure 7.4 Wiring for Controlling Output Voltage with External Voltage /
External Potentiometer
7.5 Controlling Output Current
Function
Output current Iout can be set with external voltage
Usi = U(Iext +) – U(Iext –) via control inputs Iext + (non-inverting)
and Iext – (inverting).
• The current control input functions as a differential voltage
input:
• The following applies with activated analog setpoint
(SEtUP/dPYIF/AnIF/AI_I on):
Iset = ISET + ki x U(Iext +) – ki x U(Iext –)
Iset = Resulting output current setpoint
ISET = Current setpoint which has been selected
manually or digitally
U(Iext +) = External control voltage
(0 ... 5 V 0 ... +Isetnom)
with reference to AGND (1)
U(Iext –) = External control voltage
(0 ... 5 V 0 ... –Isetnom)
with reference to AGND (1)
ki = Control coefficient = Isetnom / 5 V
I
setnom
= 60 A (SYSKON P1500-060-060)
• Max. adjusting error:
SYSKON P1500:

0.2% Inom

1.2% setting value
SYSKON P3000:

0.15% Inom

1.2% setting value
SYSKON P4500:

0.133% Inom

1.2% setting value
• Input resistance: 10 k

each
Notes
• The control inputs are not floating inputs: Their reference
point, AGND (1), is connected to the negative pole of the
power output.
• Connecting grounded circuits to the control input may result
in erroneous settings due to leakage current or ground loops.
• If the reference point of control voltage Usi is connected to the
negative output pole at the load side, the inverting input must
be connected to this point (connection b in figure 7.5).
Influences resulting from voltage drops in the output lead are
thus avoided.
• If control voltage is isolated from the output, connect Iext – to
AGND (1) (connection a in figure 7.5).
txt Meaning – Allocation Level
OFF SIG n: direct off passive high
ON SIG n: direct on active low
OUT OUTPUT ON passive high
OUTPUT OFF active low
MODE OFF or CV passive high
CC or OL active low
SEQ READY/STOP passive high
RUN active low
SSET OFF passive high
ON active low
U_LO
1
Umeas

w1 passive high
Umeas < w1 active low
U_HI
1
Umeas

w2 passive high
Umeas > w2 active low
I_LO
1
Imeas

w3 passive high
Imeas < w3 active low
I_HI
1
Imeas

w4 passive high
Imeas > w4 active low
PSP-KONSTANTER
Einstellung
USET = 0 V
ISET = Isoll
OUTPUT ON
SEtUP/dPYIF/AnIF/AI_U
on
Analog Interface
TRG 1 + 1
TRG 1 - 2
TRG 2 + 3
TRG 2 - 4
SIG 1 + 5
SIG 1 - 6
SIG 2 + 7
SIG 2 - 8
SIG 3 + 9
AGND 2 10
+15V 11
AGND 1
12
Uext + 13
Uext - 14
Iext + 15
Iext - 16
U MON 17
I MON 18
SENSE + 19
SENSE - 20
+OUT
- OUT
Usu
Last
a)
b)
PSP-KONSTANTER
Einstellung
USET = 0 V
ISET = Isoll
OUTPUT ON
SEtUP/dPYIF/AnIF/ AI_U
on
Analog Interface
TRG 1 + 1
TRG 1 - 2
TRG 2 + 3
TRG 2 - 4
SIG 1 + 5
SIG 1 - 6
SIG 2 + 7
SIG 2 - 8
SIG 3 + 9
AGND 2 10
+15V 11
AGND 1
12
Uext + 13
Uext - 14
Iext + 15
Iext - 16
U MON 17
I MON 18
SENSE + 19
SENSE - 20
+OUT
- OUT
2k?
Last
REF 02
IN
OUT +5V