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1.
1.1.
Profile
Power control of complex loads needs special pre-
cautions. This is for example the case with infrared
lamps, or Silicon Carbide heating elements. These
kind of electrical loads have not to a constant current
absorption during the work phases. This means that
at startup when cold, you could have currents up to
15 times higher than the rated current of the load. To
avoid that these phenomena cause breakdowns or
downtime, the GRM continuously monitors the absorp-
tioncurrent and with special algorithms it limits it up to
achievement of optimal conditions. The GRM is able
to guarantee a stable supply of the energy to the load
by compensating for fluctuations of the voltage on the
electricity grid, due to variations in the temperature
of the loads and the aging of the heating elements.
Thanks to the feedback algorithms (feedback in V2,
I2 and P) is always delivered same amount of energy.
The range of ultra-compact power controllers GRM-H
meets all these needs, with sizes of current from 15 to
120 Ampere, voltages up to 600Vac.
The range of solid state contactors with heatsink
GRM-H meets all these needs, with current ratings
from 15 to 120 Ampere, voltages up to 600Vac, in
extremely compact dimensions in every single size.
The thermal design of all models guarantees the con-
tinuous supply of the rated current at an ambient tem-
perature of 40°C / 104°F through high efficiency heat
sinks, assisted by fans for the 90A and 120A models.
The derating curves show how higher current values
can also be obtained for lower temperatures as well as
the possibility of mounting various devices stacked on
the DIN rail.
CONFIGURATION AND DIAGNOSTICS
For the configuration of the GRM-H series devices, an
App is available for smartphones with Android and iOS
operating systems, which can be downloaded free of
charge from the relative stores. The App interfaces to
the device via contactless NFC (Near Field Communi-
cation) technology via a small NFC Dongle (which can
be ordered as part of the device or as an accessory).
It is also possible to read diagnostic data on the opera-
tion of the load and the device (energy meters, current
peaks or over-temperatures), duplicate or share the
configurations of multiple devices through this inter-
face.
The IO-Link interface guarantees efficient commu-
nication, capable of powering, configuring, moni-
toring and controlling the device, via only 3 wires.
Complete and simple device configuration is possible
with IODD files.
The devices can also be configured using a special
cable via PC and the GF_eXpress configuration tool.
Alternatively, basic device configuration is made avail-
able by means of a button and LED on the front.
The current thresholds for partial load break alarms
can be adjusted by means of a front key or digital input,
so that multiple objects can be configured at the same
time with the electrical panel closed.
CONTROL
The GRM-H series can be controlled in different ways
PRELIMINARY INSTRUCTIONS
819XX_MAN_GRM-H_11-2022_ENG_pag. 5
face.
The IO-Link interface guarantees efficient commu-
nication, capable of powering, configuring, moni-
toring and controlling the device, via only 3 wires.
Complete and simple device configuration is possible
with IODD files.
The devices can also be configured using a special
cable via PC and the GF_eXpress configuration tool.
Alternatively, basic device configuration is made avail-
able by means of a button and LED on the front.
The current thresholds for partial load break alarms
can be adjusted by means of a front key or digital input,
so that multiple objects can be configured at the same
time with the electrical panel closed.
CONTROL
The GRM-H series can be controlled in different ways
based on the options chosen:
- Command signal configurable as 0..5V, 0..10V,
0..20mA, 4..20mA, potentiometer and PWM, for pro-
portional commands (Burstfiring, FixedCycleTime,
HalfSingleCycle, PhaseAngle).
- Control via the IO-Link point-to-point communication
protocol for comprehensive process diagnostics.
All commands are managed via push-in connectors,
for faster and easier connection, even without tools.
The device status is always displayed by a multi-co-
lour LED on the front panel, for an immediate view of
its operation. In the event of an error in the command
signal, a fault power can be programmed which the
device will maintain until the signal is restored.
POWER CONNECTIONS
Both the line voltage terminal available on the upper
part of the device and the load terminal on the lower
part are of the "cage" type, which offers the best and
safest seal even for cables of different cross-sections,
whether mounted with a cable lug or simply stripped.
DIAGNOSTICS AND ALARMS
It is increasingly vital for operators and maintainers
to recognize possible anomalies in the system imme-
diately and solve them quickly in order to ensure the
efficiency and profitability of machinery and plants.
The GRM-H series offers complete availability of load
information.
There are 3 physical outputs, two are PNP type and
one voltage-free normally open contact.
The outputs can be configured and associated with
different alarm states: partial or total breakages of the
load, lack of voltage on the load, faults on the line, over
temperature.
The thermal alarm is triggered if heat dissipation
exceeds a critical threshold, signalling it with a red led
on the front panel, interrupting the power supply and
triggering the alarm output.
This function is always present, on all current sizes.
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