SECOP MB3CKV Electronic Unit for Compressors Instructions

: September 11, 2024
: SECOP

Table of Contents

MB3CKV Electronic Unit for Compressors
Product Information
Specifications:
Product Usage Instructions:
Operational Errors:

MB3CKV Electronic Unit for Compressors

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Product Information

Specifications:

Model: Electronic Unit for MB3CKV Compressors
Part Number: 8238-65
Operating Voltage: 24V DC

Product Usage Instructions:

Power Supply:

The electronic unit should be used with the SDD Power Management
Module (SDD PMM) 101N3110 as a power supply. Connect the two units
according to the diagram in Fig. 1. Do not use the + pin above LIN
to power the electronic unit; it is an unprotected output meant to
connect directly to the battery +.

Solar Start Optimization:

To maximize operating time in solar direct drive applications,
the electronic unit features an optimized starting algorithm for
solar direct drive. This algorithm reduces the starting current
demand by adjusting the torque buildup, enabling the unit to start
efficiently even with low morning sun.

Battery Protection:

The battery protection function of the electronic unit is
disabled by the solar drive power management system. The unit is
designed for operation without a battery.

Fan Connection:

A fan can be connected to the FAN OUT terminals. Connect the
positive lead to F+ (FAN OUT) and the negative lead to F-.

Error Handling:

If the electronic unit detects an operational error, the error
can be viewed in the software. Refer to the error codes defined in
Fig. 3 for troubleshooting. Note that the electronic unit does not
have an LED indicator function.

FAQ

Operational Errors:

Error Code 7 – Communication Error:
Communication of customer display stopped for 15 minutes
(default).
Error Code 6 – Thermostat Failure: NTC
thermistor short-circuit or no connection, causing the unit to
enter manual mode.
Error Code 5 – Thermal Cut-Out: PCB
temperature exceeds minimum or maximum limits.
Error Code 4 – Minimum Motor Speed Error:
Motor unable to maintain minimum speed under heavy load.
Error Code 3 – Motor Start Error: Rotor
blockage or high differential pressure in the refrigeration
system.
Error Code 2 – Fan Over-Current Cut-Out: Fan
overloading the electronic unit.
Error Code 1 – Battery Protection Cut-Out:
Voltage outside of the cut-out setting.

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Instructions

Electronic Unit for MB3CKV Compressors

8238-65

101N2742, 24V DC

Fig. 1

Fig. 2

SDD PMM

101N3110

8908

COMPRESSOR

OUT

LIN C

! Optional third screw: max. torque: 0,9 Nm

Fan

101N2742

Thermostat or NTC resistor
t°

8929-4
The + output above LIN is not suitable to supply the controller with power. It is a unprotected output, directly connect to battery +. Rated max. current: 1A

Recommended RAST connector types

Power Supply

2-circuit Molex: 945504102

Fan

2-circuit Molex: 945504202

Display/Communication 3-circuit Molex: 932504023

Thermostat Machine Compartment

3-circuit

Molex: 932504003

Periphery SDD Power Management Module Thermistor multi-pack

101N3110 105N9615

Crimp connectors 6.3 mm | 1/4 inch

Cable Diameter Connector

0.5 mm² – 0.75 mm² Molex: 945180100

0.75 mm² – 2.5 mm² Molex: 945180201

for 2 wires 1.5 – 3.0 mm2 total

Molex: 945180400

Fig. 3

Operational errors

Error code

Error type
Can be read out in the software TOOL4COOL®

7 Communication error
(Communication of customer display stopped for 15 minutes (default)).

6 Thermostat failure
(If a NTC thermistor is short-circuit or has no connection, the electronic unit will enter manual mode).

5 Thermal cut-out of electronic unit (PCB temperature exceeds minimum or maximum limits).
4 Minimum motor speed error (If the refrigeration system is too heavily loaded, the motor cannot maintain minimum speed at approximately 2,150 rpm).

3 Motor start error
(The rotor is blocked or the differential pressure in the refrigeration system is too high (>5 bar)).

2 Fan over-current cut-out (The fan is overloading the electronic unit).
1 Battery protection cut-out (The voltage is outside the cut-out setting).

Wire dimensions DC

Size

Max. length 24V operation*

Cross AWG Cables longer than 5 meters

section

are not supported

[mm2] [Gauge] [m] [ft.]

2.5

12

5

16

*Length between battery and electronic unit

ENGLISH
This electronic unit is intended for use in a solar direct drive system (SDD) as a motor control unit for the SDD Power Management Module (SDD PMM) 101N3110. Its battery protection functionality is deactivated when connected to a solar direct drive power management system. Although the electronic unit 101N2742 is compatible with TOOL4COOL®, it is not intended to be used stand- alone, but only in combination with the 101N3110.
Installation (Fig. 1) Attach the electronic unit by pressing it linearly onto compressor Fusite® connector and brackets. Press until both screwheads snap in place. Optionally the unit can be secured against excessive vibration with a third screw.
Power supply (Fig. 2) The electronic unit shall be used with SDD Power Management Module (SDD PMM) 101N3110 as a power supply. Connect the two units according drawing in Fig. 1. Do not supply the electronic unit via the + pin above LIN. The + pin is a power output and supplies any periphery with input power up to 1A load. The connector can not be used to supply the unit with power.

Solar start optimization To extend the operating time of a solar direct drive application, this electronic unit has a starting algorithm optimized for solar direct drive. Its starting current demand is reduced by building up the torque differently, allowing the unit to start already with morning sun.
Battery protection The battery protection function of the electronic unit is deactivated by the solar drive power management system. The electronic unit is intended for operation without a battery.
Thermostat (Fig. 2) The thermostat is connected between the terminals C and T. Either a NTC (electrical thermostat) or a mechanical thermostat can be connected. Three different thermostat modes can be chosen in the software – Auto (both NTC and mechanical), NTC or Mechanical. Standard setting is Auto. In case of using a NTC the set point in the range between -40ºC and 40ºC is set with the software and the temperature can also be seen by using the interface. When using the Auto setting in the software it is not possible to obtain NTC failures, so it is recommended to set the thermostat mode to NTC when using a NTC.
Fan (Fig. 2) A fan can be connected to the FAN OUT terminals. Connect the plus to F+ (FAN OUT) and the minus to F-.

Since the output voltage between the terminals F+ (FAN OUT) and F- is always regulated to 12V, a 12V fan must be used for both 12V and 24V power supply systems. The fan output can supply a continuous power of 6Wavg. Fan settings can be adjusted via TOOL4COOL®. It is also possible to set a start delay on the fan in the range from 0 240 sec.. Factory default setting for a fan is 0 seconds. Fan speed can be adjusted through the interface from 40 100%.
Error handling (Fig. 3) If the electronic unit records an operational error, the error can be read out in the software. Error codes are defined as shown in Fig. 3 The electronit unit does not have a LED function.
Machine compartment temperature The electronic unit disables the compressor operation in case its PCB exceeds the maximum limits. The electronic unit does not limit the compressor to operate in its released conditions. It must be ensured the machine compartment temperature does not exceed the compressors maximum ratings, otherwise it might be damaged. Min. PCB temperature: -10°C (14°F) Max. PCB temperature: 110°C (230°F) Please refer to the compressor datasheet regarding operating conditions and machine compartment temperature.

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on order provided that such alterations can be made without subsequential changes being necessary to specifications already agreed. All trademarks in this material are the property of the respective companies. Secop and the Secop logotype are trademarks of Secop GmbH. All rights reserved. www.secop.com

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DES.I.102.I1.02 / 520N1322

April 2024