ABB ACH550-UH User Manual page 320

1-316
Note: Triacs used as sources for drive inputs, may have
excessive leakage current in the OFF state, enough to
read as ON to drive inputs. Driving two or more inputs,
divides the leakage current, reducing or eliminating the
problem. An alternative is to add a small capacitive load
– see figure.
WARNING! Relay coils generate noise spikes
in response to steps in applied power. To avoid
drive damage from such spikes, all AC relay
coils mounted across drive inputs require R-C
snubbers, and all DC relay coils mounted
across drive outputs require diodes – see
figure.
Analog cables
Recommendations for analog signal runs:
• Use double shielded, twisted pair cable.
• Use one individually shielded pair for each signal.
• Do not use a common return for different analog signals.
Digital cables
Recommendation for digital signal runs: A double shielded cable is the best
alternative, but single-shielded, twisted, multi-pair cable is also usable.
Control panel cable
If the control panel is connected to the drive with a cable, use only Category 5 Patch
ethernet cable.
Drive's control connection terminals
The following table provides specifications for the drive's control terminals
Frame Size
All
Control terminal descriptions
The following full-page diagram provides a general description of the control
terminals on the drive. For specific application details, see the
page 1-49.
Note: Terminals 3, 6, and 9 are at the same potential.
Technical data
Control
Maximum Wire Size
2
mm AWG
1.5 16
ACH550-UH User's Manual
AC Coil
DC Coil
Torque
Nm lb-ft
0.4 0.3
Triac
Drive
1.0 uF
Inputs
250 V
0.47 uF
Drive
Inputs
33 Ohm
Typical R-C
Snubber
+
Drive
Diode
Outputs
-
on
Application macros