PT75MDMX HAMMOND POWER SOLUTIONS, PT75MDMX Datasheet - Page 2

• Manufacturer Part Number: PT75MDMX
• Description: Control Transformer
• Manufacturer: HAMMOND POWER SOLUTIONS

Specifications of PT75MDMX

• Transformer Type: Control
• Input Voltage: 415V
• Output Voltage: 220V
• Current Rating: 680mA
• Power Rating: 75VA
• Transformer Mounting: Chassis
• Secondary Current Nom: 0.68A
• Supply Voltage: 415V
• Output Current: 0.68A
• Primary Voltages: 380 / 415V
• Rohs Compliant: Yes
• Secondary Voltages: 110 / 220V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

SECTION 1
WHAT IS A CONTROL TRANSFORMER ?
W
A control transformer is an isolation transformer designed to provide a high degree of secondary voltage stability
(regulation) during a brief period of overload condition (also referred to as “inrush current” ). Control transformers
are also known as Machine Tool Transformers, Industrial Control Transformers or Control Power Transformers.
W
the Secondary Voltage ?
When selecting the VA requirement, you use the Secondary Voltage.
C
Yes, a control transformer can be connected in reverse. However, keep in mind the output voltage will be less than
its rating, due to the compensation factor of the windings.
C
A control transformer will not regulate the voltage. Output voltage is a function of the coil’s turn ratio only, times
the input voltage.
W
All Hammond Control Transformers are vacuum impregnated with “VT Polyester Resin” and oven cured which
seals the surface and eliminates moisture. Impregnating the entire unit provides a strong mechanical bond and
offers protection from environmental conditions.
E
The VA or volt ampere output rating designates the output which a transformer can deliver for a specifi ed time at
its rated secondary voltage and rated frequency, without exceeding its specifi ed temperature rise.
I
Hammond Manufacturing utilizes Mylar, Nomex and other high quality insulating materials. Insulation is used to
electrically insulate turn to turn windings, layer to layer windings, primary to secondary windings and ground.
W
When a transformer is continually overloaded, excessive heat develops and the insulation system will begin to
breakdown. As a result, the life expectancy of the transformer is shortened due to the heat exceeding the rating
of the insulation system.
© Hammond Power Solutions Inc.
nsulating Materials, what are they made of and what is their purpose?
xplain the “VA” or “Volt Ampere Output” Rating?
an you use a Control Transformer connected in reverse ?
an a Control Transformer regulate the output voltage ?
hat is a Control Transformer ?
hen you calculate the VA requirement of a Transformer, do you use the Primary or
hat is the benefi t of “Vacuum Impregnation” on a Transformer ?
hat is the effect of “Overload”?
30
INDUSTRIAL CONTROL
TRANSFORMERS
Data subject to change without notice.