Do not measure line to ground. Voltages will vary widely when doing this.
When the load is applied, this voltage will drop
. Ideally it will only drop to 5% below the
average of the 3-phase voltages.
If your load motor runs backwards, reverse the two single-phase carry through lines T1 and T2 at
the motor that needs reversing. If these lines are switched going to the idler, then the direction of
all equipment will be reversed.
3.3 GENERAL MAINTENANCE
The rotary phase converter may operate continuously with or without a load. The converter will
run cool and quiet in the no load condition because the voltages are well balanced.
1. Never start the converter with a load applied (including transformers)
2. The converter should start within a second or two. Wait to start loads (including
transformers) until the converter reaches full speed. A timer circuit can be used to
automatically start loads after the converter reaches full speed.
3.3.1 MAINTENANCE
Keep dust and moisture from the control panel and the idler. Keep dust from accumulating in the
motor. Dust can be blown out using compressed air. Keep dust from accumulating on the
surface of a TEFC model as this prohibits proper cooling.
3.3.2 LUBRICATION
Larson Electronics rotary phase converter idler/generators are custom made and come with pre-
packed bearings using the lubricant specifically designed for this idler.
DO NOT use Lithium based lubricants
. These may cause premature bearing failure and will
void any warranty.
Be careful not to force so much grease into the bearings that the excess finds its way into the
windings of the idler. Some idlers have sealed bearings and will never require greasing. If the
idler has grease fittings located on the end bells of the idler, use the chart below for a greasing
schedule.
Frame
HP Range
Hours running
Grease Type
Up to 210
3-5
12,000
Polyrex EM
210-280
7.5-20
9,500
Polyrex EM
280-360
25-50
7,400
Polyrex EM
>360
60 & 75
3,500
Polyrex EM
