Specifications

Curtis PMC 1223/33, 1225/35, 1227/37 Manual
44
3 — PROGRAMMABLE PARAMETERS
Other Parameters
M1 IR COEFF [default access: OEM]
M2 IR COEFF [default access: OEM]
IR compensation is a method by which the controller maintains a constant vehicle
speed despite changes in motor loading. The IR speed coefficient parameter
adjusts how aggressively the controller tries to maintain constant speed under
changing load conditions. This parameter should be set at or below the resistance
(in milliohms) of the traction drive motor system including motor wiring and
connections. The IR speed coefficient should never be set higher than this value,
because jerky and uncomfortable or unsafe operation could result. The IR speed
coefficient is adjustable down to 0, with 0 equaling no IR compensation.
CALIBRATION 4 [default access: OEM]
The IR stiffness parameter allows adjustment of the IR compensation character-
istics at low speeds or light loads. The IR stiffness parameter can be programmed
from 0 to 32. Increasing the IR stiffness value makes the IR speed coefficient
response more aggressive at low speeds or light loads, but it also makes the throttle
response more harsh and abrupt. The IR stiffness value should therefore be set to
maximize the IR compensation response while maintaining as smooth a throttle
response as possible. For most applications, the midpoint setting (16) is a good
compromise.