Service Manual for Secop 101N2050 Controller

Quick Guide for Service and Diagnostics

This document provides practical, test-based procedures for the Secop 101N2050 controller, specifically for Iveco refrigeration units. It is intended for qualified personnel only. Warning: Incorrect wiring may cause damage to the controller, installation, or compressor. Always verify the production date, CODE, and program version before selecting a procedure.

Key Requirements:

• Minimum supply voltage: 25 V.
• Procedures must be performed by qualified personnel.
• Hard reset requires disconnecting the 2-pin power connector.

Controller Identification

The 101N2050 designation alone is not sufficient to identify the controller version. Before selecting a procedure, verify the production date, CODE, program, wiring configuration, and behavior of the specific unit using the label on the controller housing.

Wiring and Pinout

The controller features a 2-pin power connector and an 8-pin connector for diagnostics and fan control. Key pins include:

• 1 (-): Main negative supply (2-pin connector).
• 2 (+): Main positive supply (2-pin connector).
• 3 (F+): Fan output.
• 4 (F-): Fan output.
• 5 (D/I): Input / diagnostic communication line (used for reset).
• 9 (P): Programming pin (also used in reset procedures).

Test Conditions

Before testing, perform a pre-test inspection: check the condition of supply wires and connectors, ensure no burned contacts, and verify that connectors are properly seated. To perform a basic test:

1. Disconnect supply.
2. Make test connections.
3. Reconnect supply.
4. Wait approximately 10 seconds.
5. Observe controller and panel response.

Reset Procedures

The following procedures are used to clear faults and reset the controller:

Reset E1 (Positive to D/I and P)

1. Disconnect supply.
2. Connect heavy positive (red) to D/I (green).
3. Connect heavy positive (red) to P (white).
4. Connect supply (min. 25 V).
5. Wait 10 seconds.
6. Check display; E1 errors should be cleared.

Reset E6 (Negative to P, Positive to D/I)

1. Disconnect supply.
2. Connect heavy negative (brown) to P (white).
3. Connect heavy positive (red) to D/I (green).
4. Connect supply (min. 25 V).
5. Wait 10 seconds.
6. Check controller and panel response.

Hard Reset (Reversed Line Polarity)

Warning: Before proceeding, disconnect the 2-pin power connector from the controller. Applying positive voltage to the negative pin with the connector attached will damage the controller.

1. Disconnect supply.
2. Disconnect 2-pin connector from controller.
3. Connect heavy positive (red) to controller negative pin.
4. Connect heavy negative (brown) to F+ (thin red).
5. Connect heavy negative (brown) to D/I (green).
6. Connect heavy negative (brown) to P (white).
7. Connect supply (min. 25 V).
8. Wait 10 seconds.
9. Observe controller response.
10. Restore standard connections after test.

Frequently Asked Questions

How to clear E1 and E6 errors? Verify correct supply voltage and perform one of the confirmed reset variants (positive to D/I and P, or negative to P and positive to D/I).

How to unlock the controller after a fault? In some cases, the controller can be quickly unlocked by connecting the D/I and P wires to the positive and negative supply terminals.