5 Planning the installation
Device communication and system monitoring
Installation and Operation Manual M125HV EU V3 EN 2021-07-12
46
5.7.4 Connecting a data logger
NOTICE
Unwanted currents.
In some installation variants, unwanted currents
can flow when multiple inverters are connected
via RS485.
►
Do not use GND and VCC.
►
If the cable shield is used for providing
lightning protection then the housing of only
one inverter in the RS485 chain should be
grounded.
The inverter can be connected to a data logger via RS485, e.g.
for monitoring the PV system or changing the inverter settings.
The SUNSPEC protocol with Modbus RTU is used for data trans-
mission.
Multiple inverters can be connected in series to a data logger.
The following recommendations must be complied with to ensure
a stable data connection.
Connecting a single inverter to a data logger
►
Switch on the RS485 termination resistor.
►
Lay the cable with a suitable clearance to the AC and DC
cables to prevent interference in the data connection.
Connecting multiple inverters to a data logger
►
Switch on the RS485 termination resistor at the last inverter
in the chain.
►
If the data logger does not have an integrated RS485 ter-
mination resistor then also switch on the RS485 termination
resistor at the first inverter in the chain.
► Switch off the RS485 termination resistor at all other invert
-
ers (standard setting).
► A different inverter ID must be set at each inverter. Other
-
wise the data logger cannot identify the individual inverters.
►
Set the same RS485 baud rate at all inverters (standard:
19200).
►
Lay the cable with a suitable clearance to the AC and DC
cables to prevent interference in the data connection.
5.7.5 Connecting an external alarm unit
The inverter has two multifunction relays allowing connection of
an acoustic or visual alarm unit to each.
An event can be assigned to the dry contacts with Delta Service
Software after commissioning.
The Delta Service Software can be downloaded from www.
solar-inverter.com.
Event
Description
Disabled
The function is disabled.
On Grid
The inverter is connected to the grid.
Fan defective
The fans are defective.
Insulation
The insulation test has failed.
Alarm
An error event message, fault message or
warning has been sent.
Error
An error event message has been sent.
Fault
A fault message has been sent.
Warning
A warning message has been sent.
Table 5.9.: Events where an external alarm unit can trigger
The default setting for both relays is
Disabled
.
5.7.6 Connecting a ripple control receiver
An external ripple control receiver can be connected to the digital
inputs.
Pin assignments
Pin
Naming
Short cir-
cuit
Assigned action
1
V1
-
-
2
K0
V1 + K0
External power-off (EPO)
3
K1
V1 + K1
Maximum active power lim-
ited to 0 %
4
K2
V1 + K2
Maximum active power lim-
ited to 30 %
5
K3
V1 + K3
Maximum active power lim-
ited to 60 %
6
K4
V1 + K4
Maximum active power lim-
ited to 100%
7
K5
V1 + K5
Reserved
8
K6
V1 + K6
Reserved
Table 5.10.:
Pin assignment of the digital inputs for con-
necting a ripple control receiver
