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HVAC Drive H300 95
Issue Number: 3
Figure 4-21 Preferred chain connection for multiple motors
Figure 4-22 Alternative connection for multiple motors
4.9.5 / Δ motor operation
The voltage rating for
and Δ connections of the motor should always
be checked before attempting to run the motor.
The default setting of the motor rated voltage parameter is the same as
the drive rated voltage, i.e.
400 V drive 400 V rated voltage
230 V drive 230 V rated voltage
A typical 3 phase motor would be connected in
for 400 V operation or
Δ for 230 V operation, however, variations on this are common e.g.
690 V
Δ 400 V.
Incorrect connection of the windings will cause severe under or over
fluxing of the motor, leading to a very poor output torque or motor
saturation and overheating respectively.
4.9.6 Output contactor
A contactor is sometimes required to be installed between the drive and
motor for safety purposes.
The recommended motor contactor is the AC3 type.
Switching of an output contactor should only occur when the output of
the drive is disabled.
Opening or closing of the contactor with the drive enabled will lead to:
1. OI ac trips (which cannot be reset for 10 seconds)
2. High levels of radio frequency noise emission
3. Increased contactor wear and tear
The Drive Enable terminal (T31) when opened provides a Safe Torque
Off function. This can in many cases replace output contactors.
For further information see section 4.15 Safe Torque Off (STO) on
page 109.
4.10 Ground leakage
The ground leakage current depends upon whether the internal EMC
filter is installed or not. The drive is supplied with the filter installed.
Instructions for removing the internal filter are given in section
4.11.2 Internal EMC filter on page 98.
With internal filter installed:
Size 3 to 5: 28 mA* AC at 400 V 50 Hz
30 µA DC with a 600 V DC bus (10 MΩ)
Size 7 to 11: 56 mA* AC at 400 V 50 Hz
18 µA DC with a 600 V DC bus (33 MΩ)
* Proportional to the supply voltage and frequency.
With internal filter removed**:
<1 mA
**Please note that the internal filter is not removable on size 9E, 10E and
11E
4.10.1 Use of residual current device (RCD)
There are three common types of ELCB / RCD:
1. AC - detects AC fault currents
2. A - detects AC and pulsating DC fault currents (provided the DC
current reaches zero at least once every half cycle)
3. B - detects AC, pulsating DC and smooth DC fault currents
• Type AC should never be used with drives.
• Type A can only be used with single phase drives
• Type B must be used with three phase drives
If an external EMC filter is used, a delay of at least 50 ms should be
incorporated to ensure spurious trips are not seen. The leakage current
is likely to exceed the trip level if all of the phases are not energized
simultaneously.
If the cable between the drive and the motor is to be
interrupted by a contactor or circuit breaker, ensure that the
drive is disabled before the contactor or circuit breaker is
opened or closed. Severe arcing may occur if this circuit is
interrupted with the motor running at high current and low
speed.
Motor protection
relay
Chain connection (preferred)
connection
Inductor
Motor protection
relay
When the internal filter is installed the leakage current is
high. In this case a permanent fixed ground connection must
be provided, or other suitable measures taken to prevent a
safety hazard occurring if the connection is lost.
Only type B ELCB / RCD are suitable for use with 3 phase
inverter drives.
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