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Manual OJ Electronics Stepper motor system
MRHX-2/-4/-8Nm & DRHX-1055, -1220
HO*-DRHX-1055/1220-MAD5
Hoval factory setting is for analogue use (0-10V)
DI1: Rotor rotation
DI2: Enable external rotor guard
DI3: Signal from external rotor guard
MHRX = motor
DRHX = control unit
*The DHRX control unit is programed with a Hoval custom made UDF file
This manual is specific for the setup of the Hoval drive system in RHE
For complete instructions, information, warnings (caution/ protection) see OJ's original manual.
Also valid for Modbus or OJ's DRHX PC – Tool (link and QR-code:
https://ojelectronics.com/hvac/products/oj-drhx-drives/
Introduction
MRHX/DRHX cannot be repaired on site. Never attempt to repair defective DRHX control unit or MHRX motor.
Contact Hoval for support.
Ensuring safety before installation
Product MRHX/ DRHX must only be installed by qualified personnel or people who have received appropriate
training and have thus become qualified to install the product.
Controller DRHX contains dangerous high voltage when connected to the mains. Mains voltage must always be dis-
connected before any installation, service or maintenance tasks are performed on the product.
The test button can be operated while mains voltage is connected. The stepper motor/ rotor can be started up using
the test button, the 0–10 V input signal or via the RS-485 interface (Modbus).
Before connecting mains voltage to the DRHX controller
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all components, i.e. stepper motor, belt, pulley and rotor, must be installed correctly.
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all openings, covers and cable glands must be properly fitted and closed.
To maintain the specified enclosure rating, unused cable glands should be replaced with blank glands/ plug.
Controller DRHX contains capacitors which become charged during operation. These capacitors can remain
charged even after the power supply has been cut off. There is a risk of severe personal injury if the
connection terminals or wire ends are touched before these capacitors have been completely discharged.
The discharge time is about 3 minutes under normal conditions.
Product use
DRHX controller is used to regulate the speed of a rotary heat exchanger in air handling units. Controller DRHX can
only be used to control MRHX stepper motor, supplied by OJ Electronics A/S. Never try to connect or control other
types of stepper motor.
Technical specifications
The controller and stepper motor is controlled by signals or commands from an external control unit in the AHU.
DRHX controller has built-in stepper motor protection and has a built-in EMC filter.
The product carries a manufacturer's warranty if installed in accordance with these instructions and applicable
installation regulations. If the product has been damaged (e.g. during transportation), it must be checked and (if
necessary) repaired by OJ Electronics A/S before the product is installed, connected to mains voltage and
energized.
Contact
No 4220637 Ver 3 2020-12-17/ SESTCH
1
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Table of Contents
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Summary of Contents for Hoval MRHX-02N
- Page 1 DRHX = control unit *The DHRX control unit is programed with a Hoval custom made UDF file This manual is specific for the setup of the Hoval drive system in RHE For complete instructions, information, warnings (caution/ protection) see OJ's original manual.
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Page 2: Technical Data
Technical data MRHX-02N MRHX-04N MRHX-08N* Motor MRHX-3P0xN-03C5 Control unit DRHX-1055 MAD5 DRHX-1220 MAD5 DRHX-1220 MAD5 Max Torque 0-10 0-10 0-10 Input Signal 150 / 170 / 200 / 400* rpm Output Rpm 50Hz 1x230 1x230 1x230 Voltage Input 50/60Hz 3x0-200 V AC... -
Page 3: Mechanical Installation
It's important to fix the control unit and the motor with metallic screws into the casing If delivered mounted and fixed inside casing by Hoval above is fulfilled. If not, following need to be insured of: •... - Page 4 Opening the control unit • Check that the voltage supply to the DRHX has been disconnected before opening the cover. • Wait approx. 3 minutes after disconnecting mains voltage before removing the cover, warning see page 1. • The controller can be opened using a screwdriver or similar (see fig.13.8.1) Spring terminals •...
- Page 5 Mains voltage connection • The power supply is 230 V AC; +/-10%. • The power cable is connected to the DRHX on the terminals marked ”L”, ”N” and ”PE”. See fig. 13.12, or table 11 on page 2. • It is recommended that the PE wire is 20 mm longer than the other wires in the cable. If the cable is accidentally pulled out of the DRHX while there is voltage on the cable and terminals, the PE wire will then be the last to be disconnected.
- Page 6 The DRHX series is equipped with 4 DIP switches for setting e.g. the stepper motor size and maximum motor speed DIP 1-2: motor size / DIP 3-4: motor rpm (see table 15.1.1 and 15.1.2). Required motor rpm is calculated by Hoval. Depends on rotor Ø, pulley Ø, rotor and motor torque, and given rotor rpm. See table 15.1.3.
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Page 7: Digital Relay Output
Digital relay output • DRHX is equipped with a digital relay output, which can for example be used for alarm signals (see fig. 13.17). • The relay output is a potential-free relay with changeover switch. • The factory-configured function is an alarm relay. •... -
Page 8: Rotation Monitoring
The internal rotor monitor works automatically with a motor speed above 25 rpm. External rotor guard If external rotor guard is wired, “Internal rotor guard” will be automatically deactivated. An external sensor (3 wired) can be connected to the digital input ports (Hoval product code/ option RG3). See instructions on next page. - Page 9 Mounting instruction for rotation guard, 3 wire (mtrl no 2045980) • Connect the sensor to 5 (GND), 6 (+12V) and 7 (DI3) • Connect a jumper between 11 and 12 to activate external sensor, is there to stay. • Distance between magnet and senor: A= 3-5 mm Boost function •...
- Page 10 Calibration test for pulley/ internal rotation guard STP in the display no 5?? For example needed if received an E01 error/ alarm If drive equipment is wired by us from factory and mounted in a RHE this test have been done before delivery Before opening DRHX, the mains voltage must be disconnected for at least 3 minutes...
- Page 11 Correct and tension the belt. damaged or out of shape rotor. Check installation for damage. If needed, contact Hoval for support. If springs or dampers are used with the motor bracket, the Change to a fixed motor bracket (without vibrations can stop the MRHX motor, internal sensor will spring, dampers).
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Page 12: Troubleshooting
Defective/ broken DRHX controller Replace DRHX. Never attempt to repair a defective DRHX controller. Contact Hoval for support/ replacement/ repair. Stepper motor is defective/ broken Replace stepper motor. Never repair a defective MRHX motor. Contact Hoval for support/ replacement/ repair.
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