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: