RHEINTACHO rotas CR User manual

Programmable Speed Monitor
rotas
CR •CRR •CRA •CRRA
Operating Instructions
BA: N0000.225C/06.2022
RHEINTACHO Messtechnik GmbH
Waltershofener Straße 1
Tel. [phone] - 0
Fax [phone]
79111 Freiburg
Germany
[e-mail]
www.rheintacho.com

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The device is state of the art. It meets the
legal requirements of the EC.
2002
All rights reserved. The contents of this booklet including
data, statements and drawings for the application and
operation of the device are protected by copyright and
may not be reproduced in any form whatsoever without
the prior written permission of the manufacturers.

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The Purpose of this booklet
These Operating Instructions are essential for the safe
application and operation of the Programmable Speed
Monitor (hereafter referred to as the 'device').
It is essential that the safety notes and operational
sequences contained in the manual are strictly
observed, non-compliance with any of these could cause
danger to personnel and damage to machinery.
Read the manual before using the device and if any part
is not understood, contact the supplier for clarification
before proceeding further.
Take care of the manual:
−Always have it available during the service life of the
device.
−If the device goes to a second user make sure that
the manual goes with it.
−Any supplementary instructions that may be issued
later by the manufacturer, should be added to the
manual.
Specification changes due to product development may
be made without further notice.
Technical specification details beyond the scope of this
manual may be obtained by contacting the supplier or
the manufacturer.

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Contents:
1. Safety 41
1.1 Limits of application 41
1.2 Assembling, electrical connections,
programming and operation 41
1.3 If problems occur 42
1.4 Maintenance and warranty 42
1.5 Disposal and recycling 42
1.6 Explanation of symbols 43
2. Description of the device and its functions 44
2.1 Technical features 44
2.2 Monitoring modes 46
2.3 Principle of measurement 48
3. Identification 50
3.1 Package contents 50
3.2 Labelling 50
4. Assembly and electrical connections 52
4.1 Assembling 52
4.2 Electrical connection 52
5. Procedure at start-up 55
5.1 Monitoring Mode 55
5.2Test Mode 56
5.3 Programming mode 57
6. Programming 59
7. Technical data 67
7.1 Operational Data 67
7.2 Operating Conditions 69
7.3 Mechanical Data 70

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1. Safety
1.1 Limits of application
The safety notes and operational sequences described
in this manual must be understood and observed by all
personnel using the device.
The device is designed only for building into a control
box. Assembly and operational criteria described in
'Technical data' (Section 7) must be observed in all
respects.
The device is for measuring rpm and machine speed in
applications that have standard industrial safety
requirements, e.g. monitoring and controlling diesel
engine speeds in power plants and ships. The
programmable device processes pulse signals received
from revolution sensors, moment of momentum or
incremental measuring systems, digital revolution
measuring instruments and proximity switches. It is also
possible to process sinusoidal frequency signals using
inductive induction sensors or analogue tacho-
generators.
The manufacturers will not be responsible for accidents
or damage caused by unqualified personnel or by failure
to comply with the instructions in this manual.
1.2 Assembling, electrical connections,
programming and operation
The assembly and electrical wiring of the device must be
carried out by appropriately qualified personnel
authorized by the factory management.

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Operation and programming should be by personnel
who have been trained to perform these activities and
who are authorized by the factory management.
Information regarding the safe handling of the device
can be found in sections 3 to 6 of this manual.
1.3 If problems occur
A watchdog is controlling all device functions. It notifies
malfunctions through a flashing display. Additional, the
analogue output will be set to > 22mA. After a power
supply reset, the watchdog will be resetted too.
Any problem or failure of the device must be reported
immediately to the foreman electrician and to the plant
manager. The device should be isolated electrically and
made safe from accidental operation.
If subsequent repairs involve dismantling the unit itself it
should be returned to the manufacturer. Any
unauthorized repair will invalidate the guarantee.
1.4 Maintenance and warranty
The device does not need servicing. Damage caused by
rough handling or by attempts to open the casing will
invalidate the guarantee and exclude the manufacturers
from further liability.
1.5 Disposal and recycling
After decommissioning, the device should be disposed
of as required by local regulations. Some electronic
components whilst harmful to the environment do have a
value, therefore recycling is advantageous.

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1.6 Explanation of symbols
The following symbols are to warn or advise, they
appear adjacent to the certain parts of the text to
emphasize the relative importance of that item.
DANGER!
Potential for injury or death.
ATTENTION!
Potential for damage to the device or application.
INFORMATION!
Critical to the correct functioning of the device

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2. Description of the device and its
functions
2.1 Technical features
Fig ur e 1 Basic circuit diagram
Power supply (Figure 1, In 1, ' Power supply UB ')
Depending on the model, the device will require 18 to 36
V DC or, with a built-in DC/DC converter, 10 to 36 V DC.
Signal input (Figure 1, In 3)
The device disposes of a variable signal input: Three
types of signals (PNP, NPN and Sine) and the Trigger
level for the signal identification are programmable.

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However the device is prepared to process signals of
two-wire sensors as well as three-wire sensors.
Input (Figure 1, In 2, 'Active starting-bridge')
A pulse signal of >2.5V activates the Starting-bridge.
This condition is maintained until the pulse signal drops
below 1V and until the programmed Starting-bridge Time
has elapsed.
If no signal is present on this input, start delay will not
occur.
Outputs - Relay 1 and (optional) Relay 2 (Figure 1,
Out 1& 2)
The output relays can be programmed for the following
functions:
−Change-over function with selectable direction of
contact i.e. normally open / normally closed.
−Speed monitoring and limiting for over-speed and
under-speed (see section 2.2).
−Switch back value, starting-bridge and (Relay 1 only)
switch-back time delay (see section 2.2).
Analogue output (Figure 1, Out 3)
The optional analogue output provides variable outputs
of 0 to 20 mA or 4 to 20 mA. The output value is directly
proportional to the measured variable so that variation of
the current matches the variable being measured.

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Figure 2 Front face of the device
The six key control panel (Figure 2, item 1)
The six keys allow simple programming of all functions.
The display (Figure 2, items 2 to 8)
During the monitoring mode the LCD display shows:
−Item 2. The current measured value.
−Item 3. Optional Relay 2.
−Item 4. Relay 1.
−Item 5. Set value of relay 1
(only displayed when set limits have been violated).
−Item 6. Switch position of relay 1.
−Item 7. Switch position of relay 2.
−Item 8. The unit of measurement.
2.2 Monitoring modes
The device can be programmed to perform the following
functions:

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Over-speed monitoring
The active relay switches to the alarm mode if the upper
set speed limit is exceeded. When the speed drops back
below the switch back value and when the switch back
time delay has expired, the relay switches back to the
normal phase.
Figure 3 O ve r -s peed monitoring and controlling
Under speed monitoring
After the starting-bridge time has elapsed, the active
relay switches to the alarm mode if speed falls below the
lower set limit, the voltage drops below the start voltage.
When the speed increases to the set switch back value,
the relay will switch to the normal phase. The starting-
bridge time will only be effective if a signal is received at
input 'Active starting-bridge' (Figure 1, In 2).
Set value
Switch back value
Switch back time delay
Hysteresis

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Figure 4 Under speed monitoring and controlling
Scope
The models CRR and CRRA are capable of monitoring
simultaneously over-speed and under-speed.
2.3 Principle of measurement
The signal frequency at the signal input is modified by
measuring a number of frequency periods to give an
average figure. This is necessary to prevent fluctuations
in switching response. The actual number of periods
used for averaging will depend on programmed value of
Relay 1 (Hz) and can be set according to Figure 5.
Procedure to establish signal frequency is discussed in
'Special Functions' Section 6.
Set value
Switch back value
Starting-Bridge time
Hysteresis
Activation of the Starting-bridge

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A typical example would be to measure the pulse period
variations over a complete revolution of the machine and
then take the average.
Figure 5 Acceptable number of periods allowed for averaging
ATTENTION!
The system is calculating an average value after
each measurement time.
(Measurement time = n x time of a measurement period)
If the average measured value exceeds the trigger point
within the measuring time, the device reacts at the end
of the current measurement time. If the average value is
not reached in this time, the device needs another full
measuring time to react.
(“n” is related to the switching point of Relay1 or
specified by hand.) The formula to calculate the
response time, see programming step 20, equation 2.
Step-width
1P/200 Hz

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3. Identification
3.1 Package contents
When delivered the package will contain:
-A Speed Monitor to specification ordered
-This Operating Instruction booklet
3.2 Labeling
There are two labels on the exterior of the device that
show the following data:
−Model Code
−Part Number
−Customers ID number (If given)*
−The programmable parameters of the device
−Any factory pre-programming of these parameters*
−Country of origin
−The pin configuration
* Only where the device has been customized

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3.3 Variants
Model Output Analogue
output
Power supply Part number
CR 1 Relay without 18…36 V DC 5810.100
CRR 2 Relays without 18…36 V DC 5810.200
CRA 1 Relay with 18…36 V DC 5820.100
CRRA 2 Relays with 18…36 V DC 5820.200
CR 1 Relay without 10…36 V DC/DC 5813.100
CRR 2 Relays without 10…36 V DC/DC 5813.200
CRA 1 Relay with 10…36 V DC/DC 5823.100
CRRA 2 Relays with 10…36 V DC/DC 5823.200
Tabl e 1 Model options and power requirements
A Part Number with the suffix letter P denotes that the
device has been customized by the factory before
delivery.

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4. Assembly and electrical
connections
ATTENTION!
Possible impairment of the device function!
To ensure correct functioning, the device should only
be operated within the conditions described in Section 7,
'Technical Data'.
The switching delay of the relay outputs subsequent to
detection of under or over speed, is governed by the
number of periods required to determine an average
value. For correct functioning this must be set up as
described on page 65.
4.1 Assembling
The device is designed for attachment to a 35 mm
mounting rail.
A drawing showing key dimensions is contained in
Section7.3.
4.2 Electrical connection
ATTENTION!
Before a power supply is connected, the model Type
Code should be ascertained from the label then
identified in Section 3.1, Table 1, columns 1 & 4 to
establish the correct power requirement.

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DANGER!
Danger voltage!
Before any wiring connections are made to the
relays of the device, the relays must be in power down
positions and the power supply switched off.
The relay contacts must both operate at the same
voltage. Examples:
NOT allowed: Relay 1 with mains voltage (230 V) and
relay 2 with low voltage (24 V)
Allowed: Relay 1 and relay 2 with mains voltage (230 V)
Allowed: Relay 1 and relay 2 with low voltage (< 42 V)
INFORMATION!
The device does not require earthing.
Terminal numbering is shown on one of the two
exterior labels.
The electrical connections should be made in
accordance with Table 2 using Figure 6 to identify the
terminal numbers.
Figure 6 Numbering of the terminal screws.

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Terminal Type CR Types CrxA and CRRx
CRxA = CRA and CRRA
CRRx = CRR and CRRA
1 Input NPN/PNP/Sine
2 Sensor supply 0 V
(GND)
3 Sensor supply 12 V
4 Starting-bridge (+)
5 Starting-bridge (-)
6 FREE CRxA: Analogue output
(+)
7 Power supply UBDC (+)
8 Power supply UBDC (-)
9 Relay 1 no
10 Relay 1 com
11 Relay 1 nc
12 FREE CRRx: Relay 2 no
13 FREE CRRx: Relay 2 com
14 FREE CRRx: Relay 2 nc
15 FREE
16 FREE
CRxA:
Analogue output 0V
(GND)
Tabl e 2 Terminal connections

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5. Procedure at start-up
The device has three modes:
−Monitoring mode. See Section 5.1.
−Test mode. See Section 5.2.
−Programming mode. See Section 5.3.
ATTENTION!
Before using the device, check that its specification is
correct for the application and that, if required, it has
been correctly programmed. See Section 5.3 and 6).
INFORMATION!
Customized devices that can be recognized by the
suffix letter P to the part number have the
programming factory set. Settings are shown on one of
the two data labels attached to the housing. After
checking that these settings are correct, the monitoring
operation can be started.
Test Mode and Programming Mode are both accessed
through the Monitoring Mode.
5.1 Monitoring Mode
INFORMATION!
When the device is monitoring, the decimal point of
the display will flash.
Switch on the power supply.
All segments of the LCD display will light up for a short
period to allow a check for faulty segments. This display-
test will be prolonged as long as the ‘OK’-key is pressed.
Thereafter the device will automatically start monitoring.

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5.2 Test Mode
ATTENTION!
Potential for inadvertent switching!
When the Test mode is activated, the relay will
switch if the system is currently running at a level outside
the parameters for which the device is programmed.
Figure 7 Test Mode keys
Activating the Test mode
With the device running in the Monitoring Mode, press
and hold down the OK key and the UP arrow key (the
DOWN arrow key) simultaneously.
During this procedure, switching will be tested at set
values plus 15% and minus 15% (see Figure 7).
Releasing the keys will terminate the test sequences.
= measuring
value*1,15
= Measuring
value*0,85
Monitoring Mode
Testmode