2120/2130
SINGLE-PHASE DC SERIES
2120/2130-2
DESIGN FEATURES AND FUNCTIONS
1. Enclosed Models — These units are furnished in a compact,
die cast aluminum, nonventilated enclosure. NEMA 1 and NEMA
12 models are offered. See Figure 3 for NEMA1 and Figure 4 for
NEMA 12 model dimensions. The complete control assembly is
mounted on the front panel which can be removed from the
enclosure by removing screws. The unenclosed panel assembly
can be mounted through a cut-out in the user’s enclosure, see
Figure 5 for cut-out dimensions.
2. Chassis Models — The units are furnished as a very compact
open chassis consisting of the regulator/power conversion circuit
board mounted to a formed aluminum chassis. Some models may
be furnished with supplemental heatsink (Options 1760, 1761) to
improve heat dissipation and thereby extend the horsepower
range. Chassis units are dimensionally interchangeable with many
competitive units. See Figure 1 for dimensions of Models 2121
and 2122. See Figure 2 for dimensions of Model 2123.
3. Full-Wave Power Conversion — NEMA Code K converter
configuration formed of discrete devices rated 600 PIV.
Converter consists of two (2) SCR’s, two diodes and a free
wheeling diode which provide optimum form factor for best motor
performance and long service. Enclosed models use the control
enclosure as an integral heatsink with the power control devices
electrically isolated from the enclosure.
4. Voltage Transient Protection — Metal oxide suppressor across
the AC line minimizes the effect of high voltage spikes from the
AC power source.
5. Tachometer Feedback — All standard units except Model 2121
include a connection to accept a 35, 50 or 100 VDC/1000 RPM
feedback signal from a motor mounted DC tachometer generator
for improved speed regulation as shown in Table 4
(Unidirectional units only).
6. Horsepower Selection — Easily calibrated by built-in trimpots
to suit individual motor horsepower ratings without special
instruments, or plug-in shunts.
7. Wiring Terminals — Enclosed models are provided with barrier
terminal strips for all external power and signal wires. Chassis
models are provided with male tab wiring connectors. A terminal
strip is offered as Options 1730Aand 1730B.
8. AC Line Fuse — Enclosed models include a fuse holder for an
AC line fuse mounted on the circuit board. Chassis units do not
include a fuse as standard, but a fuse holder may be provided
with Options 1719, 1730A or 1730B.
9. Operator Controls — All enclosed models include integral
operator controls consisting of a speed setting potentiometer and
an ON-OFF AC line power switch. Switch is maintained in ON
and OFF positions. Reversing models additionally include a 3position FORWARD-STOP-REVERSE maintained switch.
Switch includes a no pass through center detent which provides
anti-plug protection.
Chassis units are controlled by external, customer furnished
switches, pushbuttons, or control logic. Includes an inhibit circuit
for automatic operation by switch, relay or PLC.
10. Line Voltage Selection — Line voltage selection is automatic
without the use of jumpers or switches.
11. Field Supply — A full-wave, transient protected motor field
supply is provided.
OPERATING CONDITIONS
1. Line Voltage Variation........................................... ±10% of rated
2. Line Frequency Variation.................................................. ±2 Hz
3. Ambient Temperature
Open Chassis Models.................................................. 0 to 50°C
(32°F to 104°F)
Enclosed Models.......................................................... 0 to 40°C
(32°F to 104°F)
4. Altitude (Standard)........................................................ 3300 feet
(1000 meters) maximum
RATINGS
1. Service Factor.......................................................................... 1.0
2. Duty.............................................................................. Continuous
3. Overload Capacity (armature circuit) (2) ........ 150% for 1 minute
4. Operating Voltages.................................................... See Table 3
5. Run Speed Potentiometer.................................... 5k ohms, 1/2W
6. Horsepower Range .............................................. See Tables 1, 2
7. Reference Power Supply (1)............................................. 10VDC
8. Line Fuse (2).................................................... Provided by others
NOTES:
(1) Units are optionally adapt-
able for use with 4-20 mA,
and 0-10 VDC.
(2) A line fuse holder is pro-
vided as standard on
2131 and 2132 Models.
Fuse clips are optional on
all other models.
PERFORMANCE CHARACTERISTICS
1. Controlled speed range – Zero to motor base speed. Speed
range with respect to the specified regulation is as listed in Table
4. See Catalog Section E for continuous duty application
limitations of DC Motors.
2. Speed Regulation – (See Table 4) - Regulation percentages
listed are of motor base speed under steady-state conditions.
Normal operation will result in performance equal to or better
than specified.
3. Efficiency (Rated Speed/Rated Load)
(a) Controller SCR regulator .................................................. 99%
(b) Complete drive with motor (typical) .................................. 85%
(1) Unidirectional models only.
ADJUSTMENTS
1. Current Limit .............................. 0-150% full-load torque (typical)
2. Maximum Speed ........................... 60-100% of motor base speed
3. Minimum Speed................................ 0-40% of motor base speed
4. IR (load) Compensation.............................. 0-100% of rated load
5. Acceleration/Deceleration (1)................................... 0-4 seconds
NOTES:
(1) Model 2121 Acceleration/Deceleration is 1.0 seconds fixed rate.
TABLE 3. OPERATING VOLTAGES
POWER SOURCE OUTPUT VDC
(Single-Phase) Armature Field
115V, 50 or 60Hz 0-90 100
230V, 50 or 60 Hz 0-180 200
TABLE 4. SPEED REGULATION CHARACTERISTICS
REGULATION
Load Line Field
Speed
METHOD
Change Voltage Heating Temperature
Range
95% ±10% Cold/Normal ±10°C
Standard
Voltage
Feedback 2% ±1% 5-12% ±2% 30:1
with IR
Compensation
Optional Speed
(Tach) 1% ±1% 0.2% ±2% 100:1
Feedback (1)