AMD5x Passive Infeed Unit and AMD5x Servo Drive - User Guide
ANCA MOTION
D-000129 Rev 09
78
The external regeneration resistor is checked every time the PIU is enabled. Refer to
The PIU monitors the regeneration resistor current which must be between acceptable limits for
the test to pass.
It is recommended to mount the resistor close to PIU connector X1, and use twisted wires of minimal lengths. If
the resistor and wiring is not installed in an enclosed cabinet, it is recommended to use shielded cable to enable
compliance with EMC emission standards.
The regeneration resistor must connect to X1. Refer to
Danger:
Do not short circuit both terminals of connector X1. Voltages up to 900V may occur at X1 terminals. Use
connecting cable with sufficient voltage insulation that conform to the requirements and applicable safety
regulations of the region of operation.
The regeneration resistor must be installed and cooled so it can dissipate the heat sufficiently. Materials near the
resistor must not be flammable. The resistor must be protected from thermal overload by a normally closed (N/C)
thermal switch which can be mounted on the body of the resistor. The thermal switch may be supplied internal to
the resistor. Refer to
– Regenerative Brake Resistor Over-Temperature Switch.
For resistors which are
user accessible a low temperature switch is recommended such as accessory
Note a low trip temperature limits the average kW capability of the resistor. Non-accessible
installations may use much higher temperature switches resulting in much higher resistor surface temperatures
and thus higher kW capability.
The regeneration resistor must be able to sustain 3 electrical load conditions:
Discharge of the DC Bus, which depends on the total bus capacitance energy, and occurs only when
the PIU is turned off.
The peak power listed in
5.9.1 Regenerative Brake Resistor
which depends on the resistor value.
The rms power during regeneration, which depends on the application cycle characteristics. The resistor
wattage rating should be greater than this value.
Capacitor Module
5.9.2
The AMD5x Capacitor module is used to increase the DC Bus capacitance and allows regenerative energy to be
stored and reused. Each module has a capacitance of 2115µF, with greater energy storage capability at lower
mains voltage. The modules are connected directly to the AMD5x system DC Bus. No pre-charging is necessary
as the PIU is capable of soft charging the DC Bus with the capacitor modules connected. A maximum of 4
capacitor modules can be installed on the AMD5x system.
For occasional and low energy applications the brake resistor can be used to dissipate the regenerative energy.
For continuous/regularly repeated or high energy applications Capacitor Modules should be added to prevent
regeneration energy being discharged into the braking resistor. The initial equipment investment can be recouped
by electricity supply savings.
Note:
At least one Capacitor Module is required when employing the 24kW PIU (AMD5-P6240-_____).
The capacitor module also has the following advantages:
Decreases ripple current in capacitors, thus reducing capacitor temperature and increases component
lifetime
Increased mains brownout ride through
Less regenerative energy dumped, thus lower cost of smaller resistor and less problem of removing
dissipated heat
The capacitor module is mounted at the right-hand end of the AMD5x system Refer
to
Summary of Contents for AMD5x Series
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