DOLD MK 9837N Varimeter Frequency Relay User Guide

Monitoring Technique
VARIMETER
Frequency Relay
MK 9837N, MH 9837

Translation of the original instructions

Product Description

The frequency relays MK 9837N and MH 9837 are used for frequency monitoring of AC voltages. They are used for monitoring the output frequenc of frequency converters (/050) or for monitoring the rotor frequency of slip ring motors. Further areas of application are the monitoring of drives in crane systems, as well as the frequency monitoring of the supply voltage in rail vehicles.

Circuit Diagrams

Connection Terminals

contacts)”

Your Advantages

• Universal usage
• Easy handling

Features

• According to IEC/EN 60255-1

• Detection of over- or underfrequency of alternating voltage (adjustable function) (detection of over- and underfrequency see datasheet
  MK 9837N/5_0)

• Fast reaction time by measuring duration of cycle of input frequency

• Universal measuring input for AC-voltages of 15 … 280 V as well as 30 … 550 V

• As option with measuring input for inverters

•  4 ranges adjustable response value 1,5 … 200 Hz or 5 … 600 Hz

• Adjustable hysteresis

• Adjustable start up time delay 0 … 50 s at function underfrequency

•  Adjustable monitoring time for missing input signal at function overfrequency

• Response delay programmable via terminals 0 … 100 s

• Alarm storing or auto-reset programmable via terminals

• Galvanic separation between measuring input, auxiliary voltage and output contacts

• MH 9837 available with wide input range for auxiliary supply (AC/DC 24 … 60 V or AC/DC 110 … 230 V)

•  2 changeover contacts, closed circuit operation

• Open circuit operation on request

• LED indication for auxiliary voltage, measuring voltage and alarm status

• MH 9837.12/008: With galvanic separated analogue output (current/ voltage) and 11 step LED chain for the actual frequency

• Device available with 2 response values and seperately controlled outputrelays for under- and overfrequency see MK 9837N/500

• 2 possible compact designs:
  MK 9837N: Width 22,5 mm
  MH 9837: Width 45 mm

Approvals and Markings

*) Only MK 9837N

Applications

• Monitoring of frequency in AC systems
• Monitoring of rotor frequency on slip ring motors
• Control and monitoring of motors in sewage water treatment plants
• Monitoring of output voltage on inverters (variant /050)
•  Monitoring of supply voltage frequency on railway rolling stock

Function Diagram

Functions

The auxiliary supply is connected to terminals A1-A2. Terminals E0-E1-E2 form the measuring input. For low voltages the measuring voltage is connected to E1-E0 and for higher voltages to E2E0 (see section technical data). The input frequency is compared to the setting value (response value = fine tunig x range). As the device measures the cycle duration the fastest frequency measurement is possible (reaction time = cycle time + 10 ms). In overfrequency mode (switch on front in pos. “>f”) the output relay switches to alarm state if the input frequency rises above the response value for a longer time then selected on the terminals. If the measuring frequency drops again under the hysteresis value, the output relay switches back to good state without delay. In underfrequency mode (switch on front in pos. “<f”) the output relay switches to alarm state, if the input frequency drops below the response value for a longer time then selected on the terminals. If the measuring frequency rises again above the hysteresis value, the output relay switches back to good state without delay.
If manual reset is chosen, the output relay stays in tripped position, even if the frequency is back to normal. The reset is made by bridging terminals X2-M or by disconnecting the auxiliary supply.
In alarm state the yellow LEDs „R1“ / „R2“ are continuously on, during time delay they flash with short pulse.
In de-energized on trip mode the output relay is energized in good state (contacts 11-14 etc. closed).
In energized on trip mode the output relay is energized in alarm state (contacts 11-14 etc. closed).
If start up delay is selected a timer is started after connection of auxiliary supply that disables the measuring circuit for the adjusted time. This start up delay avoids an alarm e.g. when starting a generator or motor.
When measuring overfrequency, monitoring of the signal on E0-E1-E2 can be selected. If the signal is missing longer then the selected monitoring time, relay 2 (contacts 21-22-24) and LED “R2” indicate alarm.
Indicators

Upper LED „UH/E“:| – Green, when only auxiliary voltage connected to A1 – A2
– Yellow/green, when measuring frequency is detected on E0-E1-E2
---|---
Lower LED „R1“ (yellow):| – On, when alarm state (under- / overfrequency) flashes (with short pulse) when time delay is active
Lower LED „R2“ (yellow):| – On, when alarm state (under- / overfrequency) flashes (with short pulse) when time delay is  active
– Additional flashes at signal monitoring alarm LEDs “R1” and “R2” flash together during  start up delay

Setting

Notes
Frequency measuring input

The standard measuring input is divided up in to voltage ranges (E1-E0 AC 15… 280 V and E2-E0 AC 30 … 550 V). If the measuring voltage is always higher then AC 30 V, the higher range should be used. To measure the output frequency on inverters the variant /5 has to 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 (see diagram in technical data).
Visual indication of measuring voltage: If the voltage on the measuring input is to low for correct function on inputs E0-E1-E2 the upper 2-colour LED “UH/E” shows green continuous light. If underfrequency is selected the unit indicates underfrequency alarm, if overfrequency is selected together with measuring signal monitoring the unit indicates measuring signal alarm. If the voltage on the measuring input is high enough the LED “UH/E” flashes yellow/green.
Start up delay / monitoring of measuring signal.
The start up time delay (tA) can be adjusted with the lowest potentiometer on the front side of the unit and is activated when connecting the auxiliary supply.
In underfrequency mode (“<f”) the start up delay can be extended/restarted at any time with a control contact between terminals X3-M. As long as  X3-M is bridged the start up delay is continuously on and the frequency is not measured. When the link on X3-M is opened the start up delay time restarts.
In overfrequency mode (“>f”) with a bridge on X3-M, the lowest potentio- meter sets the measuring signal monitoring time (tS) (The adjusted time values tA/tS are identically).
When signal monitoring in mode “>f” is selected by bridging X3-M the measuring input is monitored as follows: If during the adjusted monitoring  time interval no measuring signal is detected, measuring signal alarm isindicated. As soon as the measuring signal returns the alarm status is reset (auto reset selected) and the monitoring interval tS starts again. The alarm status is indicated on relay 2 (contacts 21-22-24) and LED “R2” and can be easily differentiated from under/over frequency alarm where both relays (contacts 11-12-14and 21-22-24) and LEDs “R1”and “R2”) are active.
The detection of missing measuring signal can increase the safety in critical applications on overfrequency. It detects if the measuring signal is connected to the input of the  device andworks correctly
Notes

Programming terminals (M-X1-X2-X3):
Attention!
The terminals M-X1-X2-X3 have no galvanic separation to the measuring circuit, and must be operated potential free.
M: Common connection (Ground) of the programming terminals
X1: A response delay of 0…100 s after connection of auxiliary supply  is achieved by connecting a X1 to M with a potentiometer or fixed  resistor (see technical data). The delay can be stopped by bridging
X1 to M at any time.
If no start up delay is required the terminals X1-M must be linked.
X2: Manual reset with NO contact push button on X2-M, auto reset with terminals X2-M bridged.
X3: When X3-M is bridged in mode “underfrequency” the start up delay is continuously active or the time is restarted. In mode  overfrequency the monitoring of the measuring signal is switched on by bridging X3-M.
Adjustment aid for start up delay and alarm delay
During the elapse of start up delay and alarm delay the yellow LED „R1“ and „R2“ is flashing with a frequency of 2 Hz. To set a specific time value in seconds the number of flash pulses can be used to check the setting: Number of flash pulses divided by 2 = time delay in seconds.
Variant MH 9837.12/008: 45 mm width
Identically to MK 9837N.12, but with 11 step LED chain indicator and galvanic separated analogue output to display the actual measured frequency. On terminals U/G of the analogue output 0-10 V are provided, on terminals I/G 0-20 mA are available. By bridging terminals Y1 and G the output can be switched over to 2-10 V and 4-20 mA. The max. value of the analogue output is indicating 2 times of the max. value of the selected range this allows also to indicate overfrequency values. The scaling is linear to the input frequency (lowest analogue value is 0 Hz). The LED chain indicator shows on 10 LEDs the actual frequency ( ≤ 10% … 100% of the setting range). If the frequency exceeds the maximum value of the range the idicator is switched over to 2 x max value and the top LED (red) is on.

Technical Data
Frequency Measuring Input (E0-E1-E2)

Standard-frequency measuring
Voltage range

Input resistance

Frequency Measuring Input for Inverters (variant /5)

Common Data for Both Measuring Inputs
Galvanic separation:
Frequency measuring input to auxiliary voltage and output contacts

Frequency ranges:

Response time
(response value):
Continously variable;
1:4 in each response value

Tolerances of the adjusted tripping values at variation of auxiliary supply and temperature: Hysterese:| Better than ± 1 %
Continously variable: 0.5 … 50 %
of adjustable response  value
---|---
Reaction time of frequency monitoring:| (Alarm delay set to 0) Duration of 1 cycle (inverse value of adjusted frequency) + 10 ms
Response delay:| Adjustable 0 … 100 s with resitor/potentiometer across terminals X1-M:
R / kΩ:| 0| 15| 22| 33| 47| 68| 100| 150| 220| 470| ∞
---|---|---|---|---|---|---|---|---|---|---|---
tv/ s:| 0| 0.3| 0.7| 1.| 2.| 5| 9| 15| 25| 50| 100
Time between connection of auxiliary supply and ready to mesure:
Start up time delay / Signal monitoring time:| Approx. 0.4 s (with start up delay is 0) 20 ms … 50 s continously variable on logarithmic scale
---|---

Auxiliary Circuit (A1-A2)

Auxiliary voltage UH
(galvanic separation):| AC 115, 230, 400 V
DC 12, 24, 48 V
AC/DC 24 … 60, 110 … 230 V (only for
MH-version possible)
---|---
Voltage range
AC:| 0.8 … 1.1 UH
DC:| 0.9 … 1.2 UH
AC/DC:| 0.75 … 1.2 UH
Frequency range
AC:| 45 … 440 Hz
Nominal consumption:
AC:| Approx. 4 VA
DC:| Approx. 2 W

Technical Data

Output (11-12-14, 21-22-24)

Contacts:
Thermal current Ith :| 2 changeover contacts
4 A|
---|---|---
Switching capacity| |
According to AC 15
NO contact:
NC contact:
According to DC 13
NO contact:
NC contact:| 3 A / AC 230 V
1 A / AC 230 V
1 A / DC 24 V
1 A / DC 24 V| IEC/EN 60947-5-1
IEC/EN 60947-5-1
IEC/EN 60947-5-1
IEC/EN 60947-5-1

Short circuit strength
Max. fuse rating:
4 A gG / gL IEC/EN 60947-5-1 Mechanical life: ≥ 30 x 106 switching cycles
Analogue Output with MH 9837.12/008
Galvanic separation AC 3750V to auxiliary supply, measuring circuit and relay outputs

change to 2 … 10 V or 4 … 20 mA by bridging terminal Y1 and G.
Scaling is linear with frequency (lowest value at f = 0, highest value at 2 x max setting value)

General Data

Nominal operating mode:Temperature range
Operation:
Storage:
Altitude:| Continuous operation
– 20 … + 60°C
(higher temperature with limitations
on request)
– 25 … + 60°C
≤ 2000 m
---|---

Clearance and creepage distance

Rated impulse voltage /
pollution degree:
Output to measuring circuit:
Output to auxiliary circuit:
Output to output:
Auxiliary circuit to
measuring input:
Programming terminals
M-X1-X2-X3:| 4 kV / 2
4 kV / 2
4 kV / 2
4 kV / 2
Without galv. separation to measuring circuit| IEC 60664-1
IEC 60664-1
IEC 60664-1
IEC 60664-1
---|---|---
EMV
Electrostatic discharge (ESD):
HF-irradiation
80 MHz … 6 GHz:
Fast transients:
Surge voltage
Between
wires for power supply:
Between wire and ground:
HF-wire guided:
Interference suppression
MK 9837N:
MH 9837:| 8 kV (air)
10 V/m
2 kV
1 kV
2 kV
10 V
Limit value class B
Limit value class A* )| IEC/EN 61000-4-2
IEC/EN 61000-4-3
IEC/EN 61000-4-4
IEC/EN 61000-4-5
IEC/EN 61000-4-5
IEC/EN 61000-4-6
EN 55011
EN 55011
---|---|---

*) The device is designed for use in an industrial environment (class A, EN 55011).
Connecting the device to a low voltage supply grid (class B, EN 55011) may cause radio frequency interference.Take suitable measures to avoid this.

Degree of protection:
Housing:
Terminals:
Housing:| IP 40
IP 20| IEC/EN 60529
IEC/EN 60529
---|---|---
Thermoplastic with V0 behaviour according to UL subject 94
Vibration resistance:
Climate resistance:| Amplitude 0,35 mm
Frequency 10 … 55 Hz
20 / 060 / 04| IEC/EN 60068-2-6
IEC/EN 60068-1

Technical Data

Terminal designation:
Wire connection:| EN 50005 1 x 4 mm2  solid or 2 x 1,5 mm2
solid or 1 x 2,5 mm2  stranded wire with sleeve
DIN 46228-1/-2/-3/-4 or 2 x 1,5 mm2  stranded wire with sleeve DIN 46228-1/-2/-3/|
---|---|---
Wire fixing:| Plus-minus terminal screws M3,5 box terminals with wire protection|
Fixing torque:
Mounting:| 0.8 Nm
DIN rail| IEC/EN 60715
Weight:
MK 9837N:
MH 9837:| Approx. 210 g
Approx. 350 g|
Dimensions
Width x heigh x depth:
MK 9837N:
MH 9837:| 22,5 x 90 x 97 mm
45 x 90 x 97 mm|

Classification to DIN EN 50155

Vibration and shock resistance:
Service temperature classes:| Category 1, Class B  OT1 compliant
OT2, OT3 and OT4 with operational limitations| IEC/EN 61373
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Protective coating of the PCB:| No|

CCC-Data

Auxiliary voltage UN:
MK 9837N:| AC 115, 230 V
DC 12, 24, 48 V|
---|---|---
Switching capacity
To AC 15
NO contact:| 1,5 A / AC 230 V| IEC/EN 60947-5-1

Technical data that is not stated in the CCC-Data, can be found in the technical data section.

Standard Types

MK 9837N.12 5 … 600 Hz UH AC 230 V
Article number: 0058719

• Switchable monitoring modus: over- or underfrequency
• Closed circuit operation
• Mode overfrequency with selectable signal monitoring
•  4 settable frequency ranges are possible: 5 … 20 Hz, 15 … 60 Hz, 50 … 200 Hz, 150 … 600 Hz
•  Settalbe hysteresis of 0,5 … 50 %
• Start up time delay / signal monitoring time: Settable to 0 … 50 s
•  Response delay: settalbe with external resitor to 0 … 100 s
•  Alarm storing or auto-reset selectable

Variants

range Width: 45 mm
MH 9837.12/008:| Similar to MK 9837N.12, but with galvanic separated analogue output (current/voltage) and 11 step LED chain. Width: 45 mm

Ordering example for variants

Characteristic

Typical sensitivity of the measuring input at variant MK 9837N.12/5

Notice

24.02.23 en / 699A
E. Dold & Söhne GmbH & Co. KG • D-78120 Furtwangen
• Bregstraße 18 • Phone +49 7723 654-0 • Fax +49 7723 654356
dold-relays@dold.com • www.dold.com
24.02.23 en / 699A

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