Device And Function Description - DOLD SAFEMASTER S UH 6932 Mode D'emploi

Device and function description

Reset the manual reset, automatic reset function
In manual reset mode, the reset input is used to restart the unit after
under or over speed. 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 speed 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
speed 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
speed threshold can be calculated as follows:
Monitoring function: „Internal window monitoring":
Maximum lower threshold =
upper speed threshold - (5% + 2 x hysteresis) x upper speed threshold
Example:
Upper speed threshold 100 Hz, hysteresis 2%
Maximum lower speed threshold =
100 Hz - (0.05 + 2 x 0.02) x 100 Hz = 91 Hz
Monitoring function: „External window monitoring:
Maximum speed threshold =
upper speed threshold - 5% x upper speed threshold
Example:
Upper speed threshold 100 Hz, any required hysteresis
maximum lower speed 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 speed 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. 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 speed 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 speed 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.
Device and function description
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 speed
is within a permitted range). Should the speed 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.
Display
In normal operating mode, all settings can be checked at any time by
pressing the UP or DOWN keys.
Additionally, the actula speed is displayed. However, this spped 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 ac-
tivation of this function the user cannot reset the counter or disable this
function again.
Only at variant /_ _ 1
Digital selection via the software Inputs: SW1 to SW4
Four various speed modes with different response parameters, can be
configured via the software Inputs: SW1 to SW4 (see Table). The electric
power supply for the inputs should be between 10V DC and 26.4V DC
to GND. A switchover configuration can also be undertaken during the
operating mode. Should a speed mode be altered whilst operating, then the
switchover time period (t ) will commence, provided the output relays are
U
switched on through the switchover, and the start-up delay time period has
expired. During this time period, no speed evaluation will be conducted and
the output relays remain energized (closed). Should during the switchover
time period the speed modus again be altered, then the switchover time
will not again be initiated. After the expiry of the switchover time period, the
monitoring function will be continued at the currently set speed mode). The
switchover time period, for example can affect the overriding of an alarm
message during the start-up stage- or the braking stage -of a generator
or electric motor.
SW1 SW2 SW3
0 0 1
0 1 1
1 0 0
1 1 0
Caution !
Any continuously repeated switching over of the speed modus
!
(always immediately after the expiry of the switchover time
period) can lead to the situation, that the equipment starts
to function similarly as in the 'Muting Mode' (i.e. the speed
monitoring function is overridden and the output relays remain
permanently on).
21
SW4 Mode
1 Frequency mode 1
0 Frequency mode 2
1 Frequency mode 3
0 Frequency mode 4
UH 6932 / 23.12.20 en / 337A