Models 1231C/1221C
The Curtis PMC models 1231C and 1221C motor
controller. An efficient and cost effective speed
control for on-road electric vehicle applications. These
controllers utilize power MOSFET technology,
pioneered by Curtis PMC, to provide benefits
unavailable with older speed control systems.
The Curtis PMC models 1231C and 1221C are high
power, heavy duty MOSFET electronic motor speed
controllers which are ideal for use in electric
commuter vehicles, light delivery
trucks, and other vehicles utilizing up to 144 volts

For DC series wound electric motors
High frequency switching and ultra low voltage drop provides
very high efficiency and quiet operation. Costs, heatsinking
requirements and motor and battery losses are reduced. Low
end torque, range and battery life are increased.
• Environmental protection provided by a sealed (factory
serviceable), rugged, anodized aluminum extrusion housing.
Simple mounting and wiring with push-on type connectors for control
signals. Plated solid copper busses used for all power
• Thermal protection and compensation circuit provides undertemperature
cutback, constant current limit over operating
range, and linear rollback in over-temperature. No sudden
loss of power under any thermal conditions.
• Frequency shifting from 15 kHz to 1.5 kHz at low throttle
settings provides improved protection against stalled motors.
• Heavy duty power base in 1231C contains additional active
devices to improve power handling capability.
• Potentiometer fault protection circuitry disables the controller
if the throttle wires become open.
• High Pedal Disable prevents controller operation if the key
switch is turned on while throttle is applied.
• Optional heatsink (p/n 16286) for model 1231C controller
improves thermal capability.
• No adjustments are required.
• Simple installation — Uses a two wire throttle potentiometer.
• Frequency of Operation: 15/1.5 kHz
• Standby Current: less than 30 mA
• Ambient Operating Temperature Range: -25°C to 50°C
• Controller Temperature Cutback Point: -25°C and +85°C

Build a car for you, not for them ! (the oil
The MODEL 810 EXCELerator is a heavy duty
industrial accelerator. The special linear design
provides a smooth resistance from the initial
switch through the final (1A) switch. A standard
feature is the ball joint on the end of the slide
provides a variety of mounting options. The unit
can be used in applications where a resistance of
0 to 5000 or 5000 to 0 ohms is required.
Potentiometer - 5000 ohms +/- 10% linear,
Active region=1.25 inch

Rated- 10A @ 125 v.a.c.
3A @ 48 v.d.c.
1.5A @ 72 v.d.c.

80* C pvc protective jacket

Stops- internal at travel limits
Travel - 1.25 inches
First .125 inch actuates initial               
Last .125 inch actuates final         
Return Spring- initial-4 pounds
final-14 pounds

Shaft- .250 inch dia. 1/4-28 thread
one              end, ball joint the other

Bearings-long life, perm lubed
molybdenum disulphide filled nylon
This is a genuine curtis part, (beware of offshore imitations)
0-5000 ohms, with microswitch
Model 810 EXCELerator
Genuine Curtis PB-6
conversions since 1975
The Zilla motor controller package comes complete with a standard Hairball. All Zillas require a Hairball in order to run. You can select options
for your Hairball above if desired. The Zilla package also includes a three foot Cat-5 cable with ferrite to connect the Zilla and Hairball, a serial
cable and adapter for connecting a laptop computer to the Hairball, a contactor snubber diode, shorting plug, two high voltage stickers and a
Zilla screwdriver. The computer that you will need for setting Hairball settings must have a RS-232 serial port with a 9 pin connection. In case
your computer is not appropriate or you just want a portable way to adjust settings, we sell an appropriate Palm Pilot handheld terminal in the
accessories section.

· Maximum nominal input voltage range for Lead Acid batteries: 72 to 300 volts.
· Absolute maximum fully loaded input voltage range: 36 to 400 volts
· Maximum motor current at 50°C heatsink temperature: 1000 Amps
· Maximum Battery Current at 200V: 950 Amps
· Maximum Battery Current at 300V: 885 Amps
· Maximum Battery Current at 400V: 800 Amps
· Continuous motor current @ 50°C coolant temp & 100% Duty Cycle: 300 Amps
· Peak Power: 320,000 Watts
· PWM frequency 15.7 kHz
· Power devices IGBT
· Voltage Drop: < 1.9 volts at maximum current.
· Simply, the most powerful controller in the industry, by far.
· Backed by over fifteen years of experience
· Water cooling for sustained high power operation.
· 1000 motor Amps available with proper cooling.
· Multiple Microprocessors which cross check for security and safety.
· Full motor current limit control with smooth temperature cutback.
· Silent high frequency operation.
· Compact size, dimensions: 7.00" Wide, 4.63" High, 9.00" Long
· Weight 15.5 lb.
The Hairball interface is required to run the Zilla controller. It is included in the Zilla package. It enables many new features and safeties listed
· Control connections to the Hairball are low voltage and referenced to the vehicle 12V ground for safety.
· Controller precharge circuit is included with self resetting fuse and arc-less main contactor control.
· Uses standard 5 K ohm potentiometer for pedal input (not supplied in package).
· Available configured to run non contact Hall Effect accelerator pedal assembly instead of the 5K pot.
· Unique "accelerator to amps" transfer function for smooth starts, even in high voltage systems.
· Standard RS-232 serial port for adjusting controller parameters.
· Programmable motor voltage and current limits.
· Programmable battery voltage and current limits.
· Valet mode to allow yet another set of settings on the fly with the flip of a switch.
· Two motor speed inputs for overspeed limiting of one or two motors. (requires motor speed sensor, not included)
· Separate voltage, current and speed limit adjustment for reverse.
· Adjustable low battery voltage protection.
· Additional battery voltage indicator set point for operating a dash warning light.
· More than forty status and error codes insure easy diagnostics in case of faults.
· No serial terminal is required to read and clear status and error codes.
· Main contactor voltage drop and stuck contactor monitoring.
· Pulse output for driving a standard 4 or 6 cylinder tachometer.
· Two dash light outputs for driving a check engine light and low battery indicator.
· Overheat indicator built into dash light output.
· Inhibits driving when plugged in, also indicated on dash light. (Requires switch on AC inlet)
· Stalled rotor protection to reduce the possibility of damaged commutators. (Requires motor speed sensor, not included)
· Optionally, up to six high side contactor drivers allow arc-less control of electric reversing and series parallel switching of dual motor systems.
· Optional Autoshift automatically shifts dual motors from series to parallel and back again at the optimum time for more power and efficiency.
· Hairball code with new features can be downloaded as it is developed by means of the bootloader and flash memory, using your home
· Dimensions: 3.5" Wide, 1.75" High, 10" Long
The Hairball has a few hardware options that can be configured when it is first manufactured:
· -P: The Hall Effect Pedal input option. This option enables the Hairball to use the HEPA throttle pedal which is sold separately in the
Accessories section. The Hairball with the -P option installed must use a HEPA pedal for input, it can no longer be used with a normal pot box.
Please see the HEPA pedal listing for important fitting information. This option is available on the base Hairball or in combination with the -A or -S.
· -A: The -A option adds six contactor drivers for controlling motor contactors. This is normally used if you plan to use contactor sets (such as the
SW202a which we sell in the Contactors section) to electrically reverse the motor(s). If you are planning on switching two motors in series
parallel arrangement (this is used in dual motor race cars) then you also will want this option. The -A option adds functionality to the standard
model and so enables for future expansion in case you are not sure of your final configuration. This can be combined with a -P option.
· -S: The Sparrow option was made for use in Sparrows but also has other applications. This option adds two contactor drivers to the standard
model for forward/reverse switching of one motor. Unlike the -A option, the Sparrow option has been configured so that it can use reversing
contactors that do not have built in microswitches for sensing contact position. This is good for vehicles like the Sparrow which are configured to
use the Kilovac EV200 type contactors for reversing therefore it is better to use the -A option when possible. The -S option also has default
settings that are reasonable for a Sparrow. Settings can be changed after setting the defaults. This can be combined with a -P option.
· Maximum nominal input voltage range for Lead Acid batteries: 72 to
348 volts.
· Absolute maximum fully loaded input voltage range: 36 to 400 volts**
· Maximum motor current at 50°C heatsink temperature: 2000 Amps
· Maximum Battery Current at 200V: 1900 Amps
· Maximum Battery Current at 300V: 1770 Amps
· Maximum Battery Current at 400V: 1600 Amps
· Continuous motor current @ 50°C coolant temp & 100% Duty Cycle:
over 600 Amps
· Peak Power: 640,000 Watts
· PWM frequency 15.7 kHz
· Power devices IGBT
· Voltage Drop: < 1.9 volts at maximum current.
*** we are suggesting not exceeding 375 volts on the EHV models
ZILLA  2K controller
ZILLA  1K controller
The HEPA (Hall Effect
Pedal Assembly) is
required for the -P option
Hairball. If you do not
have this pedal
assembly, the -P option
will not work and the -P
option is required to use
this pedal.
The HEPA package
includes 12 feet of cable
with a connector for the
pedal connection and the
installation notes.
Zilla Speed Sensor is a
hall effect sensor
embedded in a bracket
with a matching
magnet. Its open
collector output
provides four pulses
per motor revolution at
a 50% duty cycle as
utilized by the Hairball.
MC1000C Motor Controller
MC600C Motor Controller

Note: Motor controllers are built to order, typical lead time 1-2 weeks.

The MCxxxC is ZEVA’s third generation of DC motor controller, designed to be one of the best value, most reliable and easiest to use motor controllers
available for electric vehicles. Featuring an extremely tough, weatherproof anodized aluminium housing, smooth throttle response, silent operation at all
times, and the latest in power semiconductor devices to achieve an efficiency of over 99% at all times.

The MCxxxC also supports an industry-standard CAN bus interface for optional remote monitoring of controller status and statistics, reprogramming of
settings, and even throttle control over CAN bus. The MCxxxC is compatible with ZEVA’s EVMS Monitor for simple plug-and-play integration.

A range of operating parameters are programmable over CAN bus, including battery and motor voltage and current limits, throttle ramp rates, throttle type,
and motor idle functionality. The MCxxxC supports all common throttle types including 0-5V Hall Efffect, 2-wire 0-5kohm, and Hall Effect Pedal Assemblies.
Built-in multicolour LED provides visual feedback on a range of conditions such as over/under voltage, thermal cutbacks, throttle errors, overcurrent, and
various possible (but unlikely!) internal faults.
Specifications   MC1000C

Battery voltage: 12-144VDC (9-175V absolute maximum)
Power supply: 12VDC (200mA)
Maximum current: 1000A
Continuous current: 300A
On-resistance: <0.7mohm
Switching frequency: 16kHz
Fully isolated logic and power *circuits
Thermal cutback and shutdown
Independent hardware overcurrent detection
RGB status LED
Housing dimensions: 306x140x95mm
Weight: 3.5kg
Specifications  MC600C

Battery voltage: 12-144VDC (9-175V absolute maximum)
Power supply: 12VDC (200mA)
Maximum current: 600A
Continuous current: 200A
On-resistance: <1mohm
Switching frequency: 16kHz
Fully isolated logic and power *circuits
Thermal cutback and shutdown
Independent hardware overcurrent detection
RGB status LED
Housing dimensions: 202x140x95mm
Weight: 3.5kg

Motor controllers for electric vehicles typically have a large internal capacitor bank on their input with very low ESR (Equivalent Series Resistance).
As such they require inrush protection when first powering up to prevent a large current spike which can damage components – most commonly,
welding contactors shut or blowing fuses.

The ZEVA Smart Precharger is designed to offer a 2-stage soft start for motor controllers, limiting inrush current via a resistive circuit to charge up
the internal capacitors before automatically closing the main contactor when the process is complete. It can also detect faults and safely
discontinue precharge if it fails to start correctly (usually due to an external wiring fault or no battery voltage), or fails to complete within 5 seconds
(usually due to unexpected loads after the main contactor).

The precharger is available in three different resistances, to suit three different voltage ranges, as below. (Normally, select the lowest resistance
that will work with your pack voltage.)

50ohm, recommended for 12-160V nominal battery packs
100ohm, recommended for 120-240V nominal battery packs
200ohm, recommended for 200-350V nominal battery packs

Power supply: 8-18VDC (12V nominal,
3A max)
Typical precharge time: 1-2 seconds
Internal coil spike suppression diode
Dimensions: 71x25x18mm
Smart Precharger
We have several controller options for DC series wound motors !

                1-- The Zilla 1000 and 2000 Amp controllers
                2-- The ZEVA  600 and 1000 Amp controllers
                3-- The Curtis 500 amp controllers