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Unidrive SPM User Guide
87
Issue Number: 3 www.controltechniques.com
1. Galvanic isolation, i.e. do not connect the control 0V terminal to
ground. Avoid loops in the control wiring, i.e. ensure every control
wire is accompanied by its return (0V) wire.
2. Shielded cable with additional power ground bonding. The cable
shield may be connected to ground at both ends, but in addition the
ground conductors at both ends of the cable must be bonded
together by a power ground cable (equipotential bonding cable) with
cross-sectional area of at least 10mm
2
, or 10 times the area of the
signal cable shield, or to suit the electrical safety requirements of the
plant. This ensures that fault or surge current passes mainly through
the ground cable and not in the signal cable shield. If the building or
plant has a well-designed common bonded network this precaution
is not necessary.
3. Additional over-voltage suppression - for the analog and digital
inputs and outputs, a zener diode network or a commercially
available surge suppressor may be connected in parallel with the
input circuit as shown in Figure 6-33 and Figure 6-34.
If a digital port experiences a severe surge its protective trip may operate
(O.Ld1 trip code 26). For continued operation after such an event, the
trip can be reset automatically by setting Pr
10.34
to 5.
Figure 6-33 Surge suppression for digital and unipolar inputs and
outputs
Figure 6-34 Surge suppression for analog and bipolar inputs and
outputs
Surge suppression devices are available as rail-mounting modules, e.g.
from Phoenix Contact:
Unipolar TT-UKK5-D/24 DC
Bipolar TT-UKK5-D/24 AC
These devices are not suitable for encoder signals or fast digital data
networks because the capacitance of the diodes adversely affects the
signal. Most encoders have galvanic isolation of the signal circuit from
the motor frame, in which case no precautions are required. For data
networks, follow the specific recommendations for the particular
network.
6.14 SPMC/U control connections
The rectifier must be supplied from an external 24V 3A supply to feed
the fans and control circuits. When supplied with 24V and the three
phase line power input are in tolerance, the rectifier is able to provide the
user with x1 rectifier OK contact, x2 status outputs to the SPMD inverter
(indicating the status of the rectifier), and x2 status inputs for
applications using more than one rectifier in parallel (see Figure 6-36)
Figure 6-35 Location of SPMC (rectifier) control terminals
The external 24V supply must be connected to enable the Unidrive SPMC/U.
When the Unidrive SPMC/U is connected to a Unidrive SPMD, the
status output connections must be connected as shown in Figure 6-36.
Unidrive SPMC/U external 24V supply requirements
Nominal voltage:
24V
Minimum voltage:
23V
Maximum voltage:
28V
Current drawn:
3A
Minimum start-up voltage:
18V
Recommended power supply: 24V, 100W, 4.5A
Recommended fuse:
4A fast blow (I
2
t <20A
2
s)
N
If the Unidrive SPM power supply (CT part number 8510-0000) is used
to supply the Unidrive SPMA/D or SPMC/U, a fuse on the 24V supply to
the SPMC/U is not required.
Unidrive SPM power supply
CT part number:
8510-0000
Current rating:
10A
Input voltage:
85 to 123 / 176 to 264Vac auto switching
Cable size:
0.5mm
2
(20AWG)
Fuse:
5A slow-blow from supply
Signal from plant
Signal to drive
0V
0V
30V zener diode
e.g. 2xBZW50-15
Signal from plant
Signal to drive
0V
0V
2 x 15V zener diode
e.g. 2xBZW50-15
NOTE
NOTE
NOTE
