Electrical Installation; 3-Phase Contactor; Auxiliary Supply; Semiconductor Fuses - Parker 598P Applications Manual

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Electrical Installation

3-PHASE CONTACTOR

An AC Line Contactor should be connected in series with the 3 Phase Power AC Supply to the Power Stack.
The Contactor does not switch current and should be driven via the Pilot Relay provided on the Power Board.
The Pilot Relay has a limited drive capability of 3 Amps and it is likely that the Inrush Current of the Contactor
used in this application will exceed this level and thus an intermediate Slave Relay should be fitted which is
controlled directly by the Drive with Contacts of this Slave Relay used to Close the Main Contactor. If the use
of a DC Contactor is preferred the coil should be controlled by a Slave Relay as previously described however
it is important to connect an Auxiliary Contact from this DC Contactor into the Enable Input of the Drive
Module on Control Board Terminal C5 to guarantee the correct sequencing of the Control Circuits.

AUXILIARY SUPPLY

The Controller needs an Auxiliary Supply to provide the Power for the Control Electronics Power Supplies and
the Slave Relay Coil. This should be a Single Phase AC Supply in the range 110Vac to 240 Vac 50/60 Hz. The
Electronic Power Supply Circuitry will function over this range without difficulty however the Pilot Relay uses
this supply to drive the Slave Contactor; hence the Auxiliary Supply Voltage should be tailored to suit the
desired coil voltage of the Slave Relay.
When the 598/9P External Stack Controller is required to power a Motor Field with a current greater than 60
amps an Auxiliary Fan will be fitted to the module, this Fan will be either 100/120 Vac or 220/240 Vac
depending upon the Customer Order requirements.

SEMICONDUCTOR FUSES

Semiconductor Fuses should always be provided to protect the Power Thyristors under fault conditions. Where
Line Fuses are used the Coding and Mains Present should be connected to the Stack side of the Fuse to enable
the Mains Present to detect Fuse Failure and inhibit the Control Circuits. Where Limb Fuses are used Micro-
switches should be added to the Indicator Fuses to detect fuse failure and the resultant combined signal used to
disable the Controller via the Enable Input.
Semiconductor fuses must also be provided for the Field AC Supply to protect the Field Power Devices. These
fuses should be selected to limit the Fault I

CURRENT TRANSFORMERS

The Drive Module relies upon Current Transformers to provide a measurement of the outgoing Armature
Current. The unit is designed to operate with Current Transformers with a ratio of 2000:1 and the Calibration
calculations and scaling will operate normally. Any other ratio of the Current Transformer will result in a
Calibration error in the Software, i.e. a 1000:1 CT will actually result in half the expected output current.
The Current Transformer, if not purchased from Parker SSD Drives, should have a core with a low magnetising
current to reduce the measurement error, and maximum output voltage of approximately 6 volts. Under normal
operation the output from the three Current Transformers is fed via a 3 phase rectifier to a fixed burden, thus
the output voltage under normal conditions is 1.1Vdc plus two diode volt drops. The Current Transformer
should cater for a worst case overload of 3 times Full Load Current or a maximum output of 3.3Vdc plus two
diode drops.

HEATSINK THERMOSTATS

Since most High Current Stack assemblies are force cooled, a Digital Input is provided on the External Stack
Module to shutdown the controller in the event of Cooling Failure or Heatsink over-temperature. The Input
Circuitry is operating at Control Signal voltage levels hence SELV and has no Safety Isolation. If Thermostats
are being used which are fitted to a "Live" Heatsink then the contacts of the Thermostats should be "anded"
together via relay logic and the Volt Free Contact of the Output Relay used to drive the Heatsink Over-
temperature Input. It is important to ensure that each individual Thermostat is capable of providing Basic
Isolation at the Stack Supply Voltage since the contacts will be connected to drive via the Output Relay which
itself provides the second level of Basic Isolation giving Double Isolation of the SELV circuitry.
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t through the Device to within the Device Rating.
598P/599P Application Manual