Variacs
VARIAC® Variable Transformers
I have one of your MV or FV systems with automatic regulation. Is there a way to turn off regulation and manually control such a system?
The Controller Switch turns off automatic regulation on our systems that include one of our automatic controllers.
Inside the cabinet there is a Manual Raise/Lower Switch that can be used when the Controller Switch is OFF to manually raise or lower output voltage.
How long do brushes last in VARIAC transformers? How often should they be inspected?
Typical brush life in most applications is several years even with heavy usage. Operation for many years with the original brushes is not unusual.
Periodic brush inspection is recommended depending on use and environment. For most applications once per year is sufficient. Applications where the brush is in constant movement, operated with repeated periodic overloads and/or operated at high ambient temperatures may require more frequent inspections.
Are additional limit switches available for our motor driven Variac transformer? I want to use with an external circuit to signal position of transformer.
Limit switches control at the lower and upper limits of travel prevents over travel. We recommend thWhat are the standard Temperature, Humidity and Altitude Ratings for Variac Transformers?
VARIAC Standard Environmental RatingsTemperature: 0-50C; Relative Humidity: 0-95% Non-Condensing; MaCalibration of MP Control on a Variac System (Models with Display)
Calibration of MP Control on a Variac System (Models with Display) Single Channel Monitoring (MPAxT)Reforming Capacitors on Variable Frequency Drives (VFD) with Variacs
There are large capacitors in a typical VFD (Variable Frequency Drive). If the drive has beenHow to add external output modules to MP series control for Variac
Occasionally power systems with excessive surges and/or other power anomalies it is preferable to adWhat is the inrush current on a Variac variable transformer?
Inrush current is not possible to calculate since it is heavily dependent on your source impedanceHow much can I overload my Variac and for how long?
To calculate overload ratings, maximum overload time and cooldown time: Short Term Overload Ca