TUG MZ Operation Maintenance & Parts Manual page 321

Curtis 1234/36/38 Manual,
1 1 J U LY 2 0 0 8 D R A F T
KSI and coil return
KSI input provides power for all low power control circuits, power capacitor
precharge (before main contactor turn on), power supply outputs, and high
power output drivers. Battery voltage is sensed on the input for the VCL bat-
tery discharge function.
Coil Return should be wired to the positive battery side of the contactors
being driven so that switching noise associated with PWM operation of the
contactors is localized to the contactor wiring only.
It is important to maintain the division between KSI and coil return
in order to ensure reverse polarity protection (vehicle wiring correct, battery
terminals reversed).
KSI AND COIL RETURN INPUT SPECIFICATIONS
SIGNAL NAME PIN
KSI 1
Coil Return 13
*
Additionally must carry the current supplied to the driver loads by the coil return (pin 13).
**
On the 1234, the combined current supplied by all seven output drivers should not exceed 10 A
Throttle and brake inputs
The two pot inputs are independently programmable to allow use of a voltage
throttle or a 2-wire or 3-wire resistance throttle. Voltage throttles require only
the Pot Wiper input (with I/O Ground for the return line). Resistance throttles
require Pot Wiper and Pot Low (2-wire) or Pot High, Pot Wiper, and Pot Low
(3-wire). All throttle I/O is protected against shorts to B+ or B-.
Alternatively, these two inputs can be used for analog signals other than
the throttle and brake pot inputs. Configuring the inputs for use with other
signals requires VCL programming; see Section 7.
SIGNAL NAME PIN
Throttle Pot High 15
Pot2 High 27
Throttle Pot Wiper 16
Pot2 Wiper 17
Pot Low 18
Rev. D
2 — INSTALLATION & WIRING:
OPERATING
INPUT
VOLTAGE
CURRENT
Between under- 1.0 A max
and overvoltage
cutbacks
12 A max
THROTTLE INPUT SPECIFICATIONS
OPERATING
INPUT
VOLTAGE
IMPEDANCE
0 V (shorted n/a
to Pot Low)
5 V (open
circuit)
0 to 6.25 V 290 kΩ
(voltage
and 3-wire) (source,
0 to 10 V 20 Ω nom.
I/O Signal Specifications
PROTECTED
VOLTAGE TOLERANCE
* ± (MaxV + 10 V) ±8 kV (air
discharge)
**
(KSI-0.3 V) to
(MaxV + 10 V)
/
S SINK PROTECTED
CURRENT VOLTAGE TOLERANCE
7 mA -50 V to ±8 kV (air
nominal (MaxV + 10 V) discharge)
(source)
0.76 mA
nominal
2-wire)
Faults if -1 V to
above (MaxV + 10 V)
11 mA
(sink)
ESD
.
ESD
21