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Notes
Frequency measuring input
The measuring input is divided up in to voltage ranges (AC 8 ... 280 V on
E1a-E2L und E1b-E3L and AC 16...690 V on E1a-E2H and E1b-E3H). If the
measuring voltage is always higher then AC 16 V, the higher range should
be used. A special dimensioned measuring input with low pass characteristic
avoids the measuring of the pulse frequency. In addition the input sensitivity
is adapted to the voltage-/frequency-characteristic of inverters.
Plesae make sure that the frequency measuring inputs are connected to
the same single or 3-phase voltage system and that a 3-phase supply is
required for monitoring the direction of rotation.
Manual reset, automatic reset
In manual reset mode, the reset input is used to restart the unit after
over and under frequency, or after a direction of rotation error. If T1 is
connected to RES for more more then 1 second, a reset is made. A new
reset is only possible if this signal is briefly interrupted. In auto reset mode
this input is not required, as the reset is automatically operated.
Semiconductor outputs
The Semiconductor Output: 38 will indicate the status of the Relays: K1
/ K2. When the relays are energized, then the Semiconductor Output: 38
is switched on. The Semiconductor Output: 48 will report errors within the
equipment. Should an error actually exist, then the Semiconductor Output:
48 will be switched on.
The semiconductor outputs are not safety related. They can be used for
monitoring purposes.
Setting the frequency thresholds
For the monitoring functions: „internal window monitoring function" and in
the „external window monitoring function", a minimum difference between
the lower- and the upper -threshold of 5% is to be anticipated at the upper
frequency threshold, in addition to the already set hysteresis parameter.
This is internally verified during the setting of the speed threshold and an
error message will be displayed in case of any erroneous setting and/or
the setting will not be permitted by the display. The maximum settable lower
frequency threshold can be calculated as follows:
Monitoring function: „Internal window monitoring":
Maximum lower threshold =
upper frequency threshold - (5% + 2 x hysteresis) x upper frequency threshold
Example:
Upper frequency threshold 100 Hz, hysteresis 2 %
Maximum lower frequency threshold =
100 Hz - (0.05 + 2 x 0.02) x 100 Hz = 91 Hz
Monitoring function: „External window monitoring:
Maximum frequency threshold =
upper frequency threshold - 5 % x upper frequency threshold
Example:
Upper frequency threshold 100 Hz, any required hysteresis
maximum lower frequency threshold =
100 Hz – 0.05 x 100 Hz = 95 Hz
Feedbak circuit
The feedback contacts of external contactors are monitored on terminal RF.
The terminal RF gets the test signal from T2 via normally open contacts of
the contactors which are connected to terminals 14 and 24. The normally
closed contact have to be closed to start the device. If no contact extension
or reinforcement is used, the terminals RF and T2 have to br bridged.
Start up time delay t
A
The start-up delay time period expires when switching-on the auxiliary
voltage of the equipment, once the 'RF' feedback circuit is closed. In addition,
the start-up delay time period will also expire after a reset in the manual
reset mode. During this time period, no frequency evaluation is conducted.
The LED 't' will flash and the output contacts: 13 to 14 and 23 to 24 will
remain closed during this time period (depending on the evaluation of the
direction of rotation). As a result of the start-up delay time period, an alarm
message can, for example be overridden during the start-up time period of
a generator or electric motor. Should however, after a reset (in the manual
reset mode), the feedback circuit not be closed, then the equipment will
go into a safe error state.
Alarm delay t
v
The alarm-delay time period will expire when the equipment has recognised,
that the frequency exceed the permitted range. Only after the expiry of the
alarm-delay time period, will the output contacts :13 to 14 and 23 to 24 be
switched off. When the frequency again enter the permitted range during
the alarm-delay time period, then the alarm-delay function is terminated.
The LED 't' will flash during the time period.
Notes
Reset delay time t
F
The reset-delay time period represents the time during after which the
output contacts: 13 to 14 and 23 to 24 are switched on (when the frequency
is within a permitted range) (depending on the evaluation of the direction
of rotation). Should the frequency again enter the alarm state during the
runoff of the reset-delay time period (when the speed exceed the required
range), the reset-delay time period will be terminated. The LED 't' will flash
during the same time period.
The start-up delay time period will override the reset-delay time period,
i.e. when the output contacts are on by the start-up delay mode, then the
reset-delay time period will be overridden (output contacts: 13 to 14 and
23 to 24 are closed). Even after an expiry of the start-up delay time period,
the reset-delay time period will not be initiated.
Start-up tolerance n
A
The start-up tolerance runs after the auxiliary voltage of the device has been
switched on and the feedback circuit RF has been closed. In addition, the
start-up tolerance runs upon a reset in the operating mode alarm memory.
During this time, there is no evaluation of the rotary motion,
the LED "t" is blinking, and the output contacts 13-14 and 23-24 remain
closed (depending on the frequency evaluation). By means of the start-up
tolerance it is possible to suppress an alarm message during the start-up
phase. If the feedback circuit is not closed upon a reset (in operating mode
alarm memory), the device moves to a safe error state.
Alarm tolerance n
V
The alarm tolerance runs after the device has detected that the rotary
motion deviates from the predefined settings. Only after the alarm
tolerance has expired, the output contacts 13-14 and 23-24 are switched
off. If the frequency returns to the good state while the alarm tolerance is
running, the run of the alarm tolerance is stopped. During the expiration
the LED "t" is blinking.
Minimum frequency
The direction of rotation is only monitored above the set minimum frequency.
If the frequency at one of the two frequency measuring inputs is below this
set minimum frequency, the direction of rotation is regarded as correct.
Discrepancy time
Within the discrepancy time, different frequencies at both measuring inputs
are tolerated. If the discrepancy between the frequencies at the measuring
inputs lasts longer than the set discrepancy time, the device moves to a
safe error state.
Display
In normal operating mode, all settings can be checked at any time by
pressing the UP or DOWN keys.
Additionally, the frequency is displayed. However, this frequency does not
correspond to the device's accuracy and is only designed for diagnostic
purposes.
In the case of wiring errors and system failures corresponding diagnostic
messages are displayed on the display.
Parameterization using the display
See attached form page 49.
Change tracking
To detect non permitted changes of the settings, the menue item change
tracking is available. This setting allows to activate a counter once, which
is then incremented with each confirmed change of the settings. After
activation of this function the user cannot reset the counter or disable this
function again.
24
UH 6937 / 30.05.22 en / 551A
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