Electro Cam PS-6144 Series - Manual (Page 24)

2-16 Installation & Wiring
Resolver Installation
General Information Choose a mounting location for the resolver that allows convenient mechanical con-
nection of the resolver shaft to the machine. The resolver is normally driven at a 1:1
ratio to machine cycles, but this is not true in all applications. The shaft can be coupled
to the machine using a chain and sprocket, timing pulley and belt, or a direct shaft-to-
shaft coupling. If a shaft-to-shaft coupling is used, Electro Cam Corp. recommends the
use of a FLEXIBLE coupling. Flexible couplings are available through Electro Cam
Corp. and are included on the price list.
Turn power to the machine OFF prior to installation!
No provision need be made for physically rotating the resolver shaft with respect to the
machine shaft. The PS-6144 can be easily programmed to set any resolver position as
the 0
°
position.
If possible, select a location that shelters the resolver from accidental mechanical abuse,
lubricants, washdown chemicals or any other liquids. Most Electro Cam resolvers have
a NEMA 4 rating or better, but avoiding contaminants will maximize their reliability and
service life.
Figure 16 shows three commonly used Electro Cam resolvers.
Ambient Temperature Electro Cam resolvers have an ambient temperature range of -40
°
to +125
°
C (-40
°
to
+257
°
F).
Resolver Wiring Cables for non-stainless Electro Cam resolvers are shipped with one end soldered to
the resolver connector. The connector for the other end is mounted on the controller.
The shield is connected at both ends of the cable to prevent damage due to electro-
static discharge. If electrical noise problems are suspected when the control is in op-
eration, call Electro Cam Corp. for advice regarding shielding.
The resolver cable used with the stainless steel resolvers (PS-5300-02-XXX) does not
have a connector at the resolver end because screw terminals are used inside that
resolver. When properly connected, both ends of the cable shield will be connected. If
electrical noise problems are suspected when the control is in operation, call Electro
Cam Corp. for advice regarding shielding.
Resolver cables supplied by Electro Cam are a special type consisting of three indi-
vidually twisted/shielded pairs with a common braid shield. This insures that reliable
position information is being received by the controller. The use of other cable types
could degrade the accuracy of the position signals and make them more susceptible to
electrical noise. For these reasons, it is recommended that customers do not make
their own resolver cables. Electro Cam will make resolver cables any length up to 1000'
and can expedite shipment as required.