User manual

GMC-I Messtechnik GmbH 51
5.5 Voltage Monitoring Output
Functions
The U-MONITOR terminal reads out a voltage with reference to
AGND, which is proportional to output voltage Uout. This is used
as a control voltage for master-slave series connection (see
5.9.2). However, it can also be used for external measuring,
monitoring and recording.
Note:
The monitor output is not a floating output: Its reference point,
AGND, is connected to the negative output pole. Connecting
grounded measuring circuits to the monitor output may result in
erroneous measurements due to leakage current or ground
loops.
The voltage monitoring output makes reference to output voltage
acquired at the sensing leads (see 5.2).
The monitor output is short-circuit proof. It has an internal
resistance of 5 k.
U
MU
= Uout x k
MU
= 0 ... 10 V
k
MU
= 10 V / Uoutnom
= 0.25 for 40 V models
= 0.192 for 52 V models
= 0.125 for 80 V models
R
i
(U-MONITOR) = 5 k
Max. error for U
MU
: ± 0.5 mV ± 0.2%
Figure 5.5 Voltage Monitor Wiring
5.6 Current Monitoring Output
Functions
The I-MONITOR terminal reads out a voltage with reference to
AGND, which is proportional to output current Iout. This is used
as a control voltage for master-slave parallel connection (see
5.8.2). However, it can also be used for external measuring,
monitoring and recording.
Note:
The monitor output is not a floating output: Its reference point,
AGND, is connected to the negative output pole. Connecting
grounded measuring circuits to the monitor output may result in
erroneous measurements due to leakage current or ground
loops.
Monitor voltage is derived from voltage drop at the internal current
sensing resistor (shunt), which is connected to the negative
output conductor upstream from the output capacitor. In this
way, the current monitor also acquires dynamic charging and
discharging current at the output capacitor when output voltage
is increased or decreased, or when the output is activated and
deactivated.
The monitor output is short-circuit proof. It has an internal
resistance of 9.3 k.
U
MI
= Iout x k
MI
= 0 ... 10 V
k
MI
= 10 V / Ioutnom
R
i
(I-MONITOR) = 9.3 k
Max. error for U
MI
: ± 0.5 mV ± 0.3%
Figure 5.6 Current Monitor Wiring
V
+
Analog Interface
+15 V
AGND
TRIGGER +
TRIGGER 
Uset +
Uset GND
M/S Uset +
Settings:
USET = Uset
ISET = Iset
OUTPUT on/off
Uout
R
I
Load
U
MU
SSP KONSTANTER
SENSE
+SENSE
U-MONITOR
Iset +
Iset GND
+OUT
I-MONITOR
–OUT
Iout
V
+
Analog Interface
+15 V
AGND
TRIGGER +
TRIGGER 
Uset +
Uset GND
M/S Uset +
Settings:
USET = Uset
ISET = Iset
OUTPUT on/off
Uout
R
I
Load
U
MI
SSP KONSTANTER
SENSE
+SENSE
U-MONITOR
Iset +
Iset GND
+OUT
I-MONITOR
–OUT
Iout