3 — PROGRAMMABLE PARAMETERS
Curtis Model 1351 – December 2018
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pg. 66
Safety Output
e Safety Output has three distinct roles:
1. It provides controllable load power for the PWM and Digital drivers
2. Loads connected to this are protected against reversed battery connections
3. It can act as a high side driver
e Safety Output is o by default. In order to use this output as the coil return/battery supply side
connection for the loads (as shown in the example wiring diagram), it must be rst turned ON by
VCL or over the CAN bus. If this is not turned on, the loads and drivers connected to these pins
cannot operate properly.
e Safety Output is controlled by its parameter Safety_Out_Command and/or by the VCL function
Put_Driver(SAFETY_OUT,x) (where x = 0 for O or 1 for On).
VCL or CAN bus SDO command should set this output ON aer all safety checks are made and the
system is ready, but it must be on before any connected load is required to operate. VCL or CAN
SDO command can turn the Safety Output o to protect the loads in case of a system fault. e VCL
code examples are:
Safety_Out_Command = ON ;Turns ON (or OFF) the Safety
;Output. Shuts down all drivers
;if OFF.
Put_Driver(SAFETY_OUTPUT, 1) ;Turns ON the Safety Output.
;Enables all drivers as per their
;individual settings and/or VCL
;commands.
OUTPUTS — SAFETY OUTPUT
PARAMETER ALLOWABLE RANGE DEFAULT DESCRIPTION
Safety Output State
Safety_Output_State
0x3402 0x00
0 – 1
0 – 1
Read Only The present state of the output. This variable is also available in
the Monitor menu,
Monitor\Outputs\Safety Output\Safety Output State
0 = ON
1 = OFF
Safety Out Command
Safety_Out_Command
0x3408 0x00
0 – 1
0 – 1
0 Turns ON or OFF the safety Output.
Changing this parameter in CSS is only viable while KSI is On.
Cycling KSI to Off will always revert the Safety Out Command to 0
(zero), which is Off.
0 = Off. All the drivers supplied by the Coil Return (pins 11 and
12) are shut off. No B+ supply voltage is applied to the Coil
Return (pins 11 and 12). The Safety Output command can shut
down all drivers at once.
1 = On. B+ voltage is applied to the Coil Return supply (pins
11 and 12). All the drivers supplied by the Coil Return can be
individually setup/used. Maximum of 23 Amps.
Reference the example wiring diagram (Figure 4).
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