DOLD SAFEMASTER S UH 6937 Manuel D'utilisation page 21

Safety Technique
SAFEMASTER S
Frequency Monitor
UH 6937
Product Description
The frequency monitor UH 6937 serves the reliable frequency monitoring
of alternating currents and the safe monitoring of the phase sequence
resp. rotary direction of motors with 3-phase alternating currents. It is
used to monitor the output frequency of inverters or the rotor frequency
of slipring motors. An other application area is the monitoring of motors
in crane plants. Using the front side display the parameters can be easily
and comfortably adapted to the individual application or changed when
necessary. With the UH 6937 it is also possible to only monitor the
frequency applied or only the rotary direction.
Approvals and Markings
Canada / USA
All technical data in this list relate to the state at the moment of edition. We reserve the right for
technical improvements and changes at any time.
Your Advantage
• For safety applications up to PL e / Cat. 4 and SIL 3
• Simple and time saving setup without PC
• Comfortable, menu guided configuration via frontside display
• Reducing interruption time in production by extensive diagnostic functions
• Easy to integrate in existing drive applications
• For inverters up to 1200 Hz
• Possible languages: English, german, french
Features
• Corresponds
For frequency monitoring:
- PL e and category 4 according to EN ISO 13849-1
- SIL 3 according to EN 61508
For monitoring the phase sequence or direction of rotation:
- PL d and category 2 according to EN ISO 13849-1
- SIL 2 according to EN 61508
• Can be used in safety applications of frequency monitoring as
follows:
- Up to maximum SIL 3 according to EN IEC 62061
- Up to SIL 3 according to EN 61511
Can be used in safety applications of phase sequence or
direction of rotation monitoring as follows:
- Up to maximum SIL 2 according to EN IEC 62061
- Up to SIL 2 according to EN 61511
• Over-, underfrequency or window monitoring of single or
3-phase in AC systems
• Monitoring the direction of rotation with 3-phase AC voltage
• Integrated user friendly frontside display
- Comfortable, menu guided configuration
- For set point and actual value display of frequency and
direction of rotation
• Fast reaction time by measuring duration of cycle of input frequency
• Universal measuring inputs for AC-voltages of 8 ... 280 V for
single-phase monitoring as well as 16 ... 690 V for
single- and 3-phase monitoring
• Suitable for inverters
- Variant /0_ _ : Maximum input frequency 700 Hz
- Variant /1_ _ : Maximum input frequency 1200 Hz
• Adjustable hysteresis
• Adjustable reset delay function from 0 ... 100 s for frequency monitoring
• Adjustable start up time delay from 0 ... 100 s for frequency motoring
or tolerance when switching on from 0 ... 60000 periods for monitoring
the direction of rotation
• Adjustable alarm delay from 0 ... 100 s for frequency motoring or
tolerance when switching on from 5 ... 60000 periods for monitoring
the direction of rotation
• Manual or auto-reset
• Galvanic separation between measuring input, auxiliary voltage and
output contacts
• 2-channel function
• Forcibly guided output contacts
• LED-indicators and 2 semiconductor monitoring output
• Width 45 mm
• With pluggable terminal blocks for easy exchange of devices
• Variant /_ _1:
- It is possible to set a variety of response parameters by means of a
4 bit selection facility from an overriding control unit;
- Analog output (2V to 10V) corresponding to the current speed;
- Possibility to override frequency and direction of rotation monitoring
(muting);
- Adjustable switchover time from 0 ... 100 s for frequency motoring or
tolerance when switching on from 0...60000 periods for monitoring the
direction of rotation
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UH 6937 / 30.05.22 en / 551A