BOOK0795-F
37
5. FEEDBACK - Two selectable modes of analog feedback are provided, as follows. See Table 12 (page 35)
for speed regulation characteristics.
a. Armature Feedback - Counter EMF voltage feedback with IR compensation, adjustable for individ-
ual motor characteristics.
b. DC Tachometer Feedback - The controller provides voltage scaling, and terminals for accepting the
output of a DC tachometer generator, mechanically coupled to the drive motor armature. The control-
ler will automatically transfer to armature feedback if the tachometer signal is lost. Tachometer gener-
ators with an output of 8 VDC to 175 VDC at maximum speed may be used.
6. FIELD SUPPLY - A half-wave or full-wave shunt field supply is available as shown in Table 14.
7. ISOLATED REGULATOR - The internal DC circuits are isolated from the AC power source for opera-
tor and equipment safety, and for simplified application. The common of the input speed reference signal
may be grounded or connected without additional isolation to other drive controllers or grounded external
signal sources. This isolation eliminates line voltage to ground potentials on the motor speed potentiome-
ter.
8. MOTOR CONTACTOR - Controller model numbers with an ‘A’ suffix, e.g., 2601A, 2611AP3, have a
DC magnetic armature contactor, which disconnects both motor armature leads from the controller. An
antiplug circuit ensures that the contactor does not make or break DC.
9. MOTOR OVERLOAD - A nonadjustable inverse time overload circuit continuously monitors motor
armature current and shuts down the controller whenever the current exceeds 120% of rated for a length of
time of continuous operation. The length of time is determined by the amount of overload.
10. POWER CONVERSION - The DC power bridge consists of four SCR’s and a freewheeling diode. Each
device is rated at least 600 PIV. The controller base forms an integral heat sink, with the power devices
electrically isolated from the base.
11. SELECTABLE CAPABILITIES - The DIP Switch (S3) allows the user to select various modes of oper-
ation, as follows:
TABLE 14. SHUNT FIELD DATA
CONTROLLER RATING
(VAC)
SHUNT FIELD VOLTAGE
(VDC)
MOTOR SHUNT FIELD
LEAD CONNECTIONS
Half-Wave Full-Wave
a
a. Low inductance motors require a full-wave field to prevent current instability.
F1 F2
115
50 F/2 F-
100 F+ F-
230
100 F/2 F-
200 F+ F-
To Next Page
Loading...