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- Galvanic isolation of the I/O.
- Duplication of the cable shielding with an earth wire of 10 mm
minimum. The cable shielding and the earth wire must be
linked at both ends and connected to earth with the shortest
possible connection. This stratagem enables high currents to
pass into the earth wire, rather than into the shielding.
- Reinforcement of the logic and analogue I/O protection by
adding a zener diode or a peak limiter.
Elimination of uni-directional logic and analogue I/O
overvoltages
Signal
0V
1.6 - Description of cables and protection devices
• It is the responsibility of the user to connect and provide protection for the VARMECA 30 in accordance with the
legislation and regulations in force in the country of use. This is particularly important as regards the size of cables,
the type and rating of fuses, the earth or ground connection, powering down, acknowledging faults, insulation and
protection against overcurrents.
• These tables are given for information only, and must under no circumstances be used in place of the current standards.
• When using a circuit-breaker, it must be a motor circuit-breaker (D curve).
• The residual current device must be type B. Too many devices connected to a single residual current device can cause it
to trip. Check that the circuit-breaker is only protecting the VARMECA.
• Comply with the size of protection fuses.
Single-phase power supply 110V - 10 % to 120V + 10 %
P
VMA
Fuses
(kW)
rating
0.25
31 ML 025
0.37
31 ML 037
0.55
0.75
0.9
1.1
1.5
12
GENERAL INFORMATION
to the drive
30V Zener diode
(eg : 2xBZW50-15)
Cables
I (A)
(gG)
(mm
)
2
8
6.8
1.5
10
8.5
1.5
These circuits are not suitable for encoder signals or for high-
speed logic data networks, because the diodes may affect the
2
signal. The majority of encoders have galvanic isolation
between the motor casing and the encoder circuit, and in this
case, no precautions are necessary. For data networks, follow
the specific network recommendations.
If a logic output is subjected to significant overvoltages, the
drive trips on an «Old1» fault.
0V
Single-phase power supply 208V - 10 % to 240V + 10 %
VMA
PE
rating
M16 + M20
31 M 025
M16 + M20
31 M 037
31 M 055
31 M 075
32 M 090
32 M 110
32 M 150
Fuses
Cables
I (A)
(gG)
(mm
8
3.5
1.5
10
4
1.5
10
4.5
1.5
16
7
2.5
16
9
2.5
20
11
2.5
25
14
2.5
Installation and maintenance - VARMECA 30
3776 en - 2017.10 / n
PE
)
2
M16 + M20
M16 + M20
M16 + M20
M16 + M20
M16 + M20
M16 + M20
M16 + M20
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