12
£
FIGURE 6.
NX50 Servo-Motor
Optional Servo-Motor Requirements
Should the Servo-Motors not be supplied by Fireye the following guidelines should be followed
when selecting suitable motors;
All servo-motors must be of the same operating voltage, not exceeding 250V rms (high voltage ver-
sion), 50V rms (low voltage version).
All motors must be AC 50 or 60Hz.
The servo-motor current must not exceed 150mA rms (high voltage version), 750mA rms (low volt-
age version).
If the motor voltage is lower than the supply voltage then a suitable power supply (such as a trans-
former) must be provided.
The motor supply to the Controller must be protected with a suitable fuse for the motors being used,
to ensure that damage to the control unit does not occur, the absolute maximum fuse value is 4A.
The servo-motor time for 90° movement must not be less than 10 seconds or more than 60 seconds.
All servo-motors must have internal limit switches fitted which are adjusted to prevent excessive
rotation.
All servo-motors must be able to drive the load imposed on them.
All servo-motors must have suitable protection for the burner environment (for example,
NEMA4/IP65 for applications exposed to the weather).
If in any doubt about a particular servo-motor’s suitability, seek confirmation from your equipment
supplier, who have a list of suitable units.
Potentiometer requirements:
All servo-motor potentiometers should be good quality plastic film types, with high resolution.
Depending on the supply voltage, a minimum resistance is allowed for the feedback potentiometers
to prevent excessive current consumption. See page 21, Option Link Selection - “Pot Supp” for
details.
The potentiometer must be securely attached to the output shaft of the gearbox in such a way
as to give accurate indication of the shaft position under all conditions and at all times.
* Dimensions for clearance only, refer to Servo -Motor bulletin for exact dimensions
5 1/16” (128mm)
5.0” (124mm)
6 3/4
” (
169m
m)
1.0” (25mm)
