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Drive (CDM) Design
T1689 Technical Manual Rev 07
Component Selection – Electrical
MV3000 Air Cooled DELTA
Page 94
DC Overvoltage – Origin Discrimination
By monitoring the AC supply and the DC Link voltage it is possible to discriminate between a supply induced
overvoltage and a motor/load derived overvoltage (for example regeneration of power through the output
bridge beyond the braking capacity connected to the DC Link).
For this discrimination a MVC3006-4001 Mains Voltage Monitor unit and the appropriate firmware are
required.
With this hardware and software arrangement, the following actions will occur:
Mains Induced Overvoltage
In this case both the mains voltage and the DC Link will have reached predefined threshold levels. The PWM
will be inhibited until the DC Link falls below 1188V (
1%) when the software will perform an auto restart
operation and flycatch the load.
Motor/Load Induced Overvoltage
A DC Link transient without an accompanying AC supply transient will be treated in the normal way and the
drive will trip.
3.8.2
Control Circuit – Auxiliary Components
Additional components to those shown in the typical circuit diagrams will be required. Typically these are:
•
Pre-charge circuits for AEM / DC feeder schemes. See Section 3.8.6 – Pre-Charge Requirements.
•
Cooling fan supplies and controls.
•
Primary cooling fans
•
Enclosure fans
•
Temperature monitoring and protection of component and enclosure.
•
Check in specification chapter which items already have internal monitoring and
protection.
•
For those not monitored, decide on protection strategy and add monitoring as
appropriate.
•
Auxiliary control supplies.
•
The power supplies for the MV3000e controller are supplied by the SMPS unit.
•
A 24V d.c. auxiliary input connection on TB2 (pin 2 =24V, Pin 1 = 0V) is also available for
monitoring and programming the controller when the main supply is switched off.
•
24V d.c. output is available for digital inputs.
See
Table 2–13. – User I/O Termination Panel Connections
•
Customer interfaces may use other supplies these must be protected against over-current and
voltage transients.
•
Additional devices added to the CDM e.g. contactors or heaters may require 110V a.c. supplies.
3.8.2.1
Line Contactors & Relays
When installing line contactors and relays in close proximity to, or connected to, the DELTA modules the coils
must be fitted with suppression devices.
Suppression will normally take the form of a suitably sized series connected capacitor and resistor connected
across the contactor/relay coil.
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