Speed and frequency monitor
UH 6937

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.

Advantages
. 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

Technical specifications
Cat. / PL acc. to EN ISO 13849-1: 4/e
1- / 2-channel: 2
Connection: Pluggable screw terminals, Pluggable cage clamp terminals, Pluggable cage clamp terminals 2-wire
Width: 45mm
SIL CL acc. to IEC/EN 62061: 3
Approvals: UL
Nominal voltage: DC
Forcibly guided output contacts max.: 2 NO contacts
Indicator contacts: 2 Semiconductor monitoring outputs
Measuring motor voltage max.: 690V
Classification: Sensorless
Thermal current Ith max.: 8A
Type: UH 6937


Manufacturer: E. Dold & Söhne GmbH & Co. KG
Type: UH6937.02PS/61 DC24V
Art. No.: 0066820