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UMG 96-S2
23
Recommendation for overcurrent protection
device for the line protection of the supply
voltage:
6 - 16 A (Char. B, IEC-/UL approval)
Recommendation
for the maximum number of
devices
on one
circuit breaker:
·B6A maximum 4 devices.
·B16A maximum 11 devices.
NOTE
The fuse is only a line protection - it is not a de-
vice protection!
7.4 Voltage measurement
The device has 3 voltage measurement inputs
and is suitable for different connection versions.
WARNING
Risk of injury or damage to the device due to
electric voltage and improper connection!
Noncompliance with the connection conditions
for the voltage measurement inputs can
damage the device or cause serious injury and
even death.
Therefore, please observe the following:
·
Before starting work, disconnect your
system from the power supply! Verify that
there is no current.
·
The voltage measurement inputs
-
must not be connected to DC current.
-
must be provided with a suitable, labeled
fuse and circuit breaker (alternative:
miniature circuit breaker) in their
immediate vicinity.
-
are dangerous to touch.
·
Voltages that exceed the allowed nominal
network voltages must be connected via
voltage transformers.
·
Measured voltages and measured currents
must originate from the same network.
Fuse (UL/IEC-listed)
L2
L3
N
L1
7.4.1 Voltage swell
The voltage measurement inputs are designed
for measurements in low-voltage networks
(4-conductor system) in which rated voltages occur
up to 230 V phase to ground and 400 V phase to
phase.
The rated voltages and surge voltages correspond
to overvoltage category 300 V CATIII (measurement
voltage surge 4 kV).
7.4.2 Mains frequency
The device:
·requires the mains frequency for the measurement
and calculation of measured values.
·is suitable for measurement in networks in which
the mains frequency of the voltage is in the range
of 45 Hz to 65 Hz.
·requires a voltage L1-N of greater than 10 Veff
at the voltage measurement input V1 for the
automatic determination of the mains frequency.
·calculates the sampling rate of the voltage
and current measurement inputs from the mains
frequency.
If the measured voltage is missing, then the
mains frequency cannot be determined and
thus the sampling rate cannot be calculated.
The acknowledgeable error message “500”
appears. Voltage, current and all other resulting
values are calculated on the basis of the last
frequency measurement and based on possible
electric couplers and are continuously displayed.
The measured values determined are no longer
subject to the specified accuracy.
If the measurement of the mains frequency is
possible again, the device hides the error message
approx. 5 seconds after voltage recovery.
Fig. “Direct voltage measurement in a three-phase
4-conductor systems” connection version.
Disconnect device
(disconnector or circuit breaker)
Summary of Contents for UMG 96-S2
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