Installation and wiring of DEIF Multi line 2

Connect the generator voltage (UL1, UL2, UL3) to 79, 81, and 83, and connect the neutral point N to 84; Bus voltage (if GPC/PU) is connected to 85, 87, 89, and neutral N is connected to 88.

The maximum phase to phase voltage is 690V AC, which can adapt to the range of 100~690V (UL certification limits 110~480V).

It is recommended to use a 2A slow melting fuse to protect the measurement circuit. If the "black start synchronization" function (menu 2040) is enabled, it is recommended to use an automatic fuse with auxiliary contacts on the busbar side. When the fuse is damaged, it can be locked and closed through binary input to prevent accidental parallel connection.

2. Current input (terminals 73~78)

Supports 1A or 5A CT secondary side, with two lines per phase (s1, s2). CT grounding can be carried out at either end of s1 or s2, but it must be ensured that the entire circuit is grounded at one point.

The current input can withstand 4 × In continuously, 20 × In continuously for 10 seconds, and 80 × In continuously for 1 second, meeting the transient requirements of the fault.

Attention: If single-phase or phase separated wiring is used on site (such as single-phase generators), the measurement system configuration needs to be modified in the software menu, otherwise three-phase imbalance will cause false alarms.

3. Frequency measurement range

The controller automatically tracks 30~70Hz with an accuracy of Class 1.0 (negative sequence current Class 2.0). Ensure that the voltage signal is not lower than 30V in order to reliably measure the frequency.

DC power supply, binary input, and relay output

1. Power supply (terminals 1-2)

Supports 12/24V DC (8-36V continuous, minimum 6V can last for 1 second), with a maximum power consumption of 8W.

It is recommended to use the DEIF DCP-2 power module and connect it in series with a 2A slow melting fuse.

Built in power monitoring relay (terminals 3-4, normally closed), when the processor or power supply is abnormal, the contacts will disconnect and can be connected to an external alarm circuit.

2. Binary input (terminals 23-28, 43~55114~118, etc.)

All are bidirectional optocouplers, with an ON voltage of 8-36V DC and an OFF voltage below 2V, and a typical impedance of 4.7k Ω.

Can be configured for remote alarm suppression, alarm confirmation, speed/voltage regulation, mode selection, circuit breaker status (on/off), etc. Important: All dry contacts require an external power supply (24V wet connection provided by the controller). Do not connect external voltage, otherwise it may damage the optocoupler.

3. Relay output

The contact is rated at 250V AC/8A (resistive) and can be directly connected to circuit breaker closing coils, speed regulator frequency up and down signals, AVR voltage up and down signals, etc.

For inductive loads (such as contactors), RC absorption circuits or varistors must be connected in parallel for noise suppression, otherwise it may cause controller reset. Typical circuits can be found on page 54 of the manual.

4. Open electrode pulse output (terminals 20-22)

Used for kWh and kVArh pulse counting, with a maximum load of 10mA (requiring an external pull-up resistor to 8~36V DC), and cannot directly drive relays.

Analog input/output and set value wiring

1. Input of active/reactive power setting values (terminals 40-42)

0~10V or ± 10V analog quantity (passive type, requiring external power supply), can be provided by PLC output or potentiometer voltage division. Impedance 100k Ω, pay attention to shielding and grounding.

2. Load distribution line (terminals 37-39)

Used for transmitting active (terminal 37) and reactive (terminal 39) load signals when multiple machines are connected in parallel, with a signal range of -5~0~+5V and an impedance of 23.5k Ω. Shielded twisted pair cables must be used with a single end grounded to avoid common mode interference and distribution loss of control.

3. 4-20mA transmission output (options F1/F2)

Can be configured as active power, reactive power, current, voltage, etc. of the generator, actively output (internal power supply), with a maximum load of 500 Ω. The accuracy meets Class 1.0.

4. Engine sensor input (options M1/M2)

M1 provides 4 channels of 4-20mA (terminals 98-105), 2 channels of Pt100 (106-111), and 1 channel of magneto electric speed (112-113). Pt100 is connected in a three wire system and complies with EN 60751.

M2 provides 3 VDO resistance sensors (such as oil pressure, water temperature, and liquid level), sharing a common terminal and providing an internal pull-up resistor.

Communication Network Configuration and Engineering Key Points

Multi line 2 supports three mainstream fieldbus options, all located in slot # 2:

1. CANopen（H1）

Using shielded twisted pair cables, terminals 29/32 (CAN_S), 31/34 (CAN_L), and 30/33 (GND) are interconnected internally for convenient daisy chaining.

Both ends need to be connected to a 120 Ω terminal resistor, and the shielding layer is only grounded at one point.

2. Modbus RTU（H2）

RS-485 two-wire system, terminals 29/33 (A+), 31/35 (B -), 30/33 (GND). Internal interconnection also provides dual terminals for easy branching.