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Functions
The auxiliary voltage is connected to terminals A1-A2. he equipment
can be configured via the display and the setting keys on the front plate.
Terminals E1a, E1b, E2L, E2H, E3L and E3H form the measuring input.
For low voltages the measuring voltage is connected to E1a-E2L and
E1b-E3L and for higher voltages to E1a-E2H and E1b-E3H (see section
technical data).
When monitoring single phase AC voltage, it is recommended to connect
the terminals E1a-E2L or E1a-E2H directly to the inverter, the terminals
E1b-E3L or E1b-E3H directly to the motor connection terminals. Seperate
wires in separate cables with space to each other have to be used for
each of the frequency inputs. When monitoring 3-pase AC voltages it is
recommended to wire these terminals directly to the motor connection
terminals.
The input frequency and direction of rotation is compared to the setting
value. As the device measures the cycle duration the fastest frequency
measurement is possible.
Should the over-frequency function be set, then the output relay will
switch to the alarm mode, when the set response parameter is over-
exceeded longer than the parametered alarm-delay function (t
the frequency fall again below the response parameter, minus the set
hysteresis, the output relay will be activated after the expiry of the reset-
delay time period (t
) (depending on the evaluation of the direction of
F
rotation) and return to its pre-set permitted supervisory state.
As regards the under-frequency function, the output relay will switch to the
alarm mode, when the set response parameter is under-exceeded longer
than the parametered alarm-delay function (t
the frequency return to the range governed by the response parameter,
plus the set hysteresis, then the output relay will again return to the pre-
set permitted state after the expiry of the reset-delay time period (t
(depending on the evaluation of the direction of rotation).
In the „internal window function mode", the output relay will switch to the
alarm setting when the frequency exceed the pre-set permitted range of
the response parameter. Once the frequency again return within the range
of both the upper- and lower response parameters, minus and/or plus the
pre-set hysteresis values (upper response parameter minus- and/or the
lower response parameter plus -the relative hysteresis values), then the
output relay will again switch back to the pre-set permitted range after the
expiry of the reset-delay time period (t
the direction of rotation).
In the „external window function mode", the monitoring function acts
inversely to the „internal window function".
If the detection of the rotary direction is activated, the output relays switch
to alarm position when the rotary direction detected deviates from the
set rotary direction (Direction of rotation=wrong). If the rotary direction
changes after that (Direction of rotation=correct), the output relays switch
back to the good position (depending on the frequency evaluation). The
rotary direction is only monitored from the adjustable minimum frequency
onwards. Below this set minimum frequency, the rotary direction is
considered as correct.
If the frequency monitoring and the monitoring of the rotary direction are
activated, then the output relays only switch or remain in the good position
if the good state is fulfilled for both monitoring functions.
If the frequency monitoring and the monitoring of the rotary direction are
deactivated, the output relays are in alarm position.
Should the manual reset function be activated, then the output relay
continues to remain in good range or the direction of rotation in the
good state in the alarm setting when the frequency return to the pre-set
permitted range. A resetting of the saved parameter is possible when the
reset input is activated or the auxiliary voltage is shutdown. When a start-
up delay time period (t
) is set, then the set start-up delay time period
A
will initially expire as soon as the auxiliary voltage of the equipment is
switched-on and the 'RF' feedback circuit is closed. The start-up delay
time period will also expire after a reset of the manual reset mode. During
this time period, a frequency evaluation is disabled and the output relays
remain (depending on the evaluation of the direction of rotation) at the pre-
set permitted setting. The start-up delay function can, for example override
an alarm message during the start-up stage of a generator or electric
motor. Should, after a reset (in the manual reset mode), the feedback
circuit not be closed, then the equipment will go into a safe error state.
If a start-up tolerance (nA) is set, first the counter for the start-up tolerance
runs once the auxiliary voltage of the device has been switched on and
the feedback circuit RF has been closed. Likewise, 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, and the output relays remain
in good position (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 changes to a safe error state.
). Should
V
) time period. As soon as
V
) (depending on the evaluation of
F
Functions
With correct connection it is possible to realise with the UH 6937 the safety
functions STO (Safe Torque Off), SOS (Safe Operating Stop), SLS (Safely
Limited Speed), SSM (Safe Speed Monitor), SSR (Safe Speed Range) as
well as SDI (safe direction of motion) according to EN 61800-5-2. The actual
realisation of the safety functions has to be validated in each application
of the product for safety aspects.
Indicators
LED ON:
Green
Green-flashing
Red-flashing
LED K1/K2: Green
Yellow
LED ERR:
Red
Red-flashing
LED t:
Green-flashing
Yellow-flashing
)
F
Yellow-flashing
DISPLAY:
23
On, when supply connected
Parameterization mode
Parameterization error
Relay K1 and K2 energized
Muting (Relay K1 and K2 energized)
Internal failure
External failure
(K1/K2; light up)
Delay times runoff t
or t
A
U
or tolerance procedure n
or n
A
(K1/K2 does not light up)
Delay time runoff t
F
(K1/K2 light up)
Delay time runoff t
V
or tolerance procedure n
V
Status indication
Alarms / diagnostics
Parameterization
UH 6937 / 30.05.22 en / 551A
U
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