How do I connect a ripple control receiver to the DRM port? : Service Center

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How do I connect a ripple control receiver to the DRM port?

If the feed-in power of a PV system is to be controlled by the grid operator, a ripple control receiver is installed for this purpose. The DRM port of Solis inverters can be directly connected to the switching contacts of a ripple control receiver.
This allows for either a 0% - 100% control or a 0% - 30% - 60% - 100% control. This functionality is also possible in systems with multiple inverters.

DRM Port Pin Assignment

The DRM port has an RJ45 socket. The pin assignment can be found in the wiring diagram.
Potential-free switching contacts are connected to the DRM port, allowing the inverter to be remotely controlled. The switching outputs of the ripple control receiver are connected directly here.
There are two possible control methods:

Using pins 5 and 6, the inverter can be switched on and off (0% - 100% control).
Using pins 1 to 4, the output power can be limited in four stages (0% - 30% - 60% - 100% control).

Connecting the DRM Port to the Ripple Control Receiver

Foto: Delock

For connection to the ripple control receiver, we recommend using an adapter with an RJ45 connector and a terminal block, such as the Delock 65977 RJ45 terminal block. The wiring from the terminal block to the ripple control receiver can then be done using standard wire conductors.
The cable length between the ripple control receiver and the furthest inverter should not exceed 15 meters.

Alternatively, standard patch cables (network cables) can be connected directly to the ripple control receiver. The wire colors in a patch cable are:

White - Orange
Orange
White - Green
Blue
White - Blue
Green
White - Brown
Brown

Some three-phase grid-feed inverters in the 80kW to 110kW range have two DRM ports. If multiple such devices are present in a PV system, the inverters can be interconnected using patch cables. The first inverter is connected as described below, and for all other inverters, the connection is made in parallel as outlined.

0% - 100% Control

The 0% - 100% control is implemented using pins 5 and 6 of the DRM port, which are connected to the corresponding contact on the ripple control receiver.
This contact must be a normally closed (NC) switch. The contact remains closed during normal operation.

When the contact is opened, the inverter shuts down.
If multiple inverters are installed, all devices must have their pin 5s interconnected and pin 6s interconnected.

0% - 30% - 60% - 100% Control

In this control method, pins 1 to 4 serve as signal inputs, which receive +12V from pin 7 via the switching contacts of the ripple control receiver.
These contacts (S1 to S4) must be normally open (NO).

Closing one of these contacts reduces the inverter’s feed-in power to the corresponding level.
Pins 5 and 6 must be bridged, or the inverter will not connect to the grid.

If multiple inverters are installed, pins 1 to 4 and pin 8 (GND) must be interconnected across all inverters.

Pin 7 (+12V) can optionally also be interconnected.
Pins 5 and 6 must be bridged on all inverters, or they will not connect to the grid.
If the inverters are linked using patch cables, the bridge between pins 5 and 6 is required only on the first inverter.

0% - 100% Control

If switch S0 is closed, the inverter operates normally.
If S0 is opened, the inverter shuts down within 1 second and disconnects from the grid. The display will show "DRM Ctl Off".
If the switch is closed again, the inverter reconnects to the grid within 30 seconds. During this time, the display will show "Waiting", then "Generating" once operational.

0% - 30% - 60% - 100% Control

This functionality is only available if switch S0 remains permanently closed (bridge between pin 5 and pin 6).
Switching contacts S1 to S4 must be connected as per the wiring diagram.

Switch	Default Setting	Adjustable Range
S1	0%	0…110%
S2	30%	0…110%
S3	60%	0…110%
S4	100%	0…110%

If multiple switches S1 to S4 are closed simultaneously, the priority order is:
S1 > S2 > S3 > S4
(e.g., if S1 and S2 are both closed, the inverter follows the setting of S1).
If none of the switches S1 to S4 are closed, the inverter resumes operation without power limitations.

Activating DRM Control via Inverter Display (Grid-Tied Inverters)

By default, DRM functionality is disabled, and the switching contacts are inactive.

To enable DRM via the inverter display:

Go to:
Menu → Special Settings → Work Mode Settings → DRM Settings
Use the DRM ON/OFF option to enable or disable remote control.

⚠️ Note: If multiple inverters are present in the system, DRM must be activated and configured individually on each device.

Activating DRM Control via SolisCloud (S6 Hybrid Inverters)

✅ Currently supported on:

S6-EH3P(12–20)K-H
S6-EH3P(30–50)K-H

By default, DRM is disabled, and the switching contacts are non-functional. DRM can be activated through the SolisCloud platform as follows:

Step-by-Step Activation:

Log into your SolisCloud account.
Click on your plant.
From the plant view, click the serial number of the inverter you want to configure.
On the inverter overview page, click the "Inverter Control" button.

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