Vestil EPT-30 - Manual (Page 66)

66
Curtis PMC 1207/1207A Manual A-11
APPENDIX A: GLOSSARY
feature disabled (i.e., a single-mode controller), you can adjust the maximum
speed mechanically via the trimpot labeled “
LOW
” on top of the controller.
The maximum creep speed setting is also adjustable via these two methods;
see Creep speed. The maximum emergency reverse speed is adjustable only via the
programmer.
Static-return-to-off (SRO)
The SRO feature prevents the vehicle from being started when “in gear.” SRO
checks the sequencing of brake input—or of KSI and brake input—relative to a
direction input. The brake input must come on before a direction is selected. If
a direction is selected before or simultaneously (within 50 msec) with the brake
input, the controller is disabled. There are three types of SRO: SRO relative to
brake input alone (Type “1” in the programming menu); SRO relative to both
KSI and brake input (Type “2”); and SRO relative to KSI, brake, and forward
inputs (Type “3”). The handheld programmer can be used to set the controller to
operate with any of these types of SRO, or with no SRO (SRO Type “0”).
If your controller is programmed so that both KSI and brake input are
required (SRO Type “2”), the following sequence must be followed to enable the
controller:
STEP
1, KSI on;
STEP
2, brake released (brake input “high”); and
STEP
3,
direction selected. The interval between steps 1 and 2 is the same as between steps
2 and 3; that is, KSI input must precede brake input by at least 50 msec. Once
the controller is operational, turning off either KSI or the brake causes the
controller to turn off; re-enabling the controller requires the 3-step sequence.
Similarly, if your controller is programmed so that KSI, brake, and forward
inputs are all required (SRO Type “3”), they must be provided in that sequence
in order to enable the controller. Note, however, that operation is allowed if a
reverse input precedes the brake input; this can be useful when operating a walkie
on ramps.
Sequencing delay, which can be set with the handheld programmer, provides
a variable delay before disabling the controller. If the brake is applied while
direction is selected, SRO is not activated if the brake is then released before the
delay time elapses.
Temperature compensation for current limits
Full temperature compensation provides constant current limits throughout the
normal operating range (heatsink temperatures of -25
°C to +85°C). The tem-
perature sensor is also used to calculate and display the heatsink temperature on
the handheld programmer.