2 — INSTALLATION AND WIRING
Curtis 1232E/34E/36E/38E & 1232SE/34SE/36SE/38SE Manual, os 31 – May 2017 Return to TOC
pg. 16
Analog Outputs
A single line is available as a low power analog output and is intended to drive instrumentation such
as a battery discharge indicator. is output is generated from a ltered PWM signal and has about
1% ripple. e 2% settling time is <25 ms for a 0–5 V step and <30 ms for a 0–10 V step. is output
line is protected against shorts to B+ or B−. Note: e 1232E/SE does not have this analog output.
ANALOG OUTPUT SPECIFICATIONS
Signal Name Pin
Output
Voltage
Output
Current
Protected Voltage ESD Tolerance
Analog Out 30 0 to 10 V 10 mA
–1 V to
(MaxV + 10 V)
± 8 kV
(direct strike)
Power Supply Outputs
Two lines provide auxiliary output power for low power circuits such as electronic throttles, LED
indicators, displays, position encoder, and remote I/O boards. I/O Ground (at pin 7) is the return
line for these low power devices. Both power supply outputs are protected against shorts to B+ or B−.
POWER SUPPLY OUTPUT SPECIFICATIONS
Signal Name Pin Output Voltage
Output
Current
Protected Voltage ESD Tolerance
+12 V Out 25 11.5 to 14.5 V
100 mA max
for +12 Out
100 mA max
for +5 Out
200 mA max
(combined total)
–1 V to
(MaxV + 10 V)
± 8 kV
(direct strike)
+5 V Out 26 5 V ±10%
I/O Ground 7 n/a 500 mA max not protected
KSI and Coil Return
e KSI input provides power for all low power control circuits. is includes the microprocessors,
power supply outputs, power for the digital and PWM driver outputs, the power-capacitor
precharge (before main contactor closure). Battery voltage is sensed on the input for the VCL battery
discharge function.
Coil Return (pin 13) 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 (e.g., vehicle wiring correct, battery terminals reversed).
KSI and COIL RETURN INPUT SPECIFICATIONS
Signal Name Pin
Operating
Voltage
Input Current Protected Voltage ESD Tolerance
KSI 1
Between under-
and overvoltage
cutbacks
13 A max * continuous ± (MaxV + 10 V)
± 8 kV (direct
strike)
Coil Return 13 10 A or 12 A max **
(KSI – 0.3 V) to
(MaxV + 10 V)
* Including current from the coil return (pin 13).
** 12 A for 1236E/SE and 1238E/SE; 10 A for 1232E/SE and 1234E/SE.
13
24
1
23
35
12
13
24
1
23
35
12
Quick Links:
Figure 3 wiring diagram p.12
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