Parker H Series - Power Distribution

Industrial Automation Wiring and Grounding Guidelines E115P
9
Power Distribution
You can connect the power supply directly to the secondary
of a transformer (Figures 7 and 8). The transformer
provides DC isolation from other equipment not connected
to that transformer secondary. Connect the transformer
primary to the AC source; connect the high side of the
transformer secondary to the L1 terminal of the power
supply; connect the low side of the transformer secondary
to the neutral (common) terminal of the power supply.
Notes:
1 To minimize EMI generation, connect a suppressor across an
inductive load.
2
In many applications, a second transformer provides power to the
input circuits and power supplies for isolation from the output circuits.
3 Connect a suppressor here to minimize EMI generation from the
net inductive load switched by the CRM contacts. In some
installations, a 1µf 220Ω suppressor or 2µf 100Ω suppressor has
been effective.
Figure 7 – Grounded AC Power-Distribution System with Master-Control Relay
+–
Back-Panel
Ground Bus
Step-Down
2
Transformer
FUSE
Multiple E-Stop
Switches
Start
CRM
Grounded Conductor
CRM
CRM
L1 N or L2
GND
CRM
1FU
L1
2FU
L2
3FU
L3
L1
L2
L3
Disc.
H
1
H
3
X
1
X
2
H
2
H
4
Suppressor
1
Controller
Power Supply
Input
Module
Wiring
Arm
Output Module
Wiring Arm
Output
Actuator
To DC I/O
Actuators/
Sensors
Incoming
AC
User DC
Supply
Input
Sensor
Enclosure
Wall
To Motor
Starters
Suppressor
1
Suppressor
3
The I/O circuits form a net
inductive load switched by
the CRM contacts. Therefore,
a suppressor is needed
across the line at the load
side of the CRM contacts.
Grounding-Electrode
Conductor to
Grounding-Electrode
System
Equipment-
Grounding
Conductors
Connect When
Applicable