PCE Health and Fitness DRH E Parts list manual

PCE Messtechnik UG
Technical description DRH E
Rotational direction sensor version 6.0
with output for speed measurement

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1. Description
The rotational direction sensor is able to contactless detect a direct current motor`s direction of
rotation. The rotational direction is detected as soon as the motor is started (the magnetic field
changes when the motor is swichtched on) and is evaluated logically.
The measuring result is available as h-level at the digital outputs OUT ROTATIONAL
DIRECTION 1 or OUT ROTATIONAL DIRECTION 2. These outputs are short circuit-, overload-
and induction peak-protected.
The sensor detects the direction of rotation before thr rotor starts to turn. For the
measurement, an h-level is required at the input START. After that, the output OUT
START MOTOR is activated. With this signal, the sensor is ready for measurement and
the motor can be started. Once the motor has been started, the rotational direction is
indicated by an h-level at output OUT ROTATIONAL DIRECTION 1 or OUT
ROTATIONAL DIRECTION 2. This h-level will be stored up until the next START.
The following faults are recognized:
1.1 Rotational direction fault due to swapped cables
1.2 Rotational direction fault due to polarity reversal of magnets

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2. Electric data
Min. operating voltage
23
V
-
Max. operating voltage
25
V
-
Max. output current of digital outputs
- OUT ROTATIONAL DIRECTION 1
- OUT ROTATIONAL DIRECTION 2
-
OU
T START
MOTOR
100 mA
Max. output current
-
MEASURING INSTRUMENT
4 mA
Max. output current
-
LINEAR OUT
4 mA
Characteristic values at 24 V operating voltage:
Supply current (unloaded)
68 mA
h
-
level output voltage (digital outputs)
operating voltage
–
2V
= 22V
l
-
level output voltage (digital outputs)
0.7V
Signal threshold h
-
level input S
TART
(operating voltage
–
1V) / 2 = 11.5 V
3. Pin assignment
Pin No. Designation Connection
cable, 7
-
pin
1
LINEAR OUT
brown
2
EXTERNAL NULL BALANCE
3
MEASURING INS
TRUMENT
+
4
MEASURING INSTRUMENT
-
5
NULL BALANCE 10 V
6
PROGRAMMING SWITCH
7
NC
8
0 V
blue
9
24 V
pink
10
START (=RESET Sensor)
white
11
NC
12
Feedback “START” recognized
grey
13
OUT ROTATIONAL DIRECTION 1
yellow
14
OUT ROTATIONAL DIRECTION
2
gree
n
Enclosure
SHIELDING

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4. Positioning the sensor
In order for it to reliably detect the motor`s rotational direction, the sensor must be correctly
positioned.
In principle, the area between two stator magnets should be chosen.
This results in the following positions for the different models:
4.1 Picture of rotational direction sensor
abgeflachte Seite
Sensoranschluß
4.2 DRH E 030 = 30° setting angle
sensor connection
flattened side

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4.3 DRH E 090 = 90° setting angle
4.4 DRH E 180 =180° (or0°) setting angle
Caution! Attention must paid to the sensor`s positions relative to the motor.
It is only possible to correctly determine the rotational direction in the gap between
the stator magnets.
The start signal may only be given when the engine is in position.
Furthermore the sensor is not to be exposed to mechanical shocks due to the Hall
element’s habit of emitting signals when receiving strong shocks and thus possibly
falsifying the result.

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5. Order details
30° version: DRH-E 030
90° version: DRH-E 090
180° version: DRH-E 180
Attention:
The DRH-E version need ten minutes “warm-up-time” after
delivering of power.
6. Compensation of an interfering magnetic field with the PCE
TEST-BOX-3
1. Compensation of an interfering magnetic field.
In the "Internal" switch position, an ambient magnetic field is displayed on the bar graph. Before
delivery, the sensor was set to “min” with magnetic shielding. If the bar graph now shows more
than three elements, there is a disturbing magnetic field which could impair the evaluation.
1. Compensation with test box
There must be no test object in front of the sensor!
- Set the switch to external
- Adjust the potentiometer until the bar graph is set to "min".
This should enable flawless test operation.
2. Readjust the sensor
- Set the switch to "Internal"
- Carry out the procedure according to the instructions in programming and test mode.
Various function tests are also carried out here.
The sensor can then be operated again without a test box.

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PCE Messtechnik UG
Bölgenweg 6
D-77855 Achern
Phone [phone]
Fax [phone]
www.pce-systems.com
[email protected]

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PCE connecting cable Clac 802
Connect the Clac 802 connection cable to the sensor. DO NOT twist the plug while unplugging it.
If the plug is twisted it can cause a short circuit through the wacky cable and can destroy the sensor
© Lemo Elektronik GmbH