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IronHorse GSD8 DC Drives User Manual – 1st Ed. Rev. A – 10/15/2019
Parameter Parameter Name
Description
GSD8-
240-5C
All other
GSD8
drives
50
Alarm Activation
Condition
This defines which conditions will result in the alarm 1 output being
activated.
• Mode 0: Always Inactive
The alarm output will remain in an inactive state. In this state, the NC
and C contacts will be internally electrically connected.
• Mode 1: Always Active (When Power Is Applied)
• The alarm output will become active when the power is applied to the
unit. In this state, the NO and C contacts will be internally electrically
connected.
• Mode 2: Active When Display Value Above Limit
The alarm output will activate when the displayed value is above the
upper limit setting, parameter 58.
• Mode 3: Active When Display Value Below Limit
The alarm output will activate when the displayed value is below the
lower limit setting, parameter 57.
• Mode 4: Active When Display Value Inside Range
The alarm output will activate when the displayed value is greater than
or equal to lower limit settings and less than or equal to the upper
limit setting.
• Mode 5: Active When Display Value Outside Range
The alarm output will activate when the displayed value is less than the
lower limit setting or greater than upper limit setting.
• Mode 6: Active When Target (Display) = Zero
The alarm output will activate when the displayed value is equal to
zero. This allows the alarm output to be used to drive a mechanical
brake to decrease stopping time or to provide holding torque at zero
speed.
• Mode 7: Active When Main Pickup Signal (S1) Stalled or stopped
The alarm output will activate when the main pickup signal input (S1)
has stalled or stopped. The alarm lower limit (Parameter 57) is used
to specify the stall timeout, in seconds, under a motor stall condition.
When using the lower limit to set the stall timeout, an inhibit
command or zero speed command will not be recognized as a stall
condition.
The pickup is considered to have stalled if the timeout passes with
no pickup pulses when the target (displayed) value is greater than
zero and the control has not been given an inhibit command. The
alarm upper limit (Parameter 58) is used to specify a zero speed or
stopped timeout condition in seconds. When using the upper limit
to set a zero speed or stopped timeout, an inhibit command, a zero
speed command or a motor stall condition will all be recognized as a
stopped condition. The pickup is considered to have stopped after the
timeout passes with no pickup pulses.
NOTE: When using the upper limit to set a stopped timeout the
lower limit should be set to zero.
• Mode 8: Active When Driving At Maximum Conduction Angle
The alarm output will activate when the control is driving the motor at
the maximum conduction angle. This can be used to determine if the
control is running away due to a broken pickup signal wire when stall-
detection is not desired.
Alarm 1 Logical “OR”
Activation Conditions
(Flags Table 1)
This Parameter, in conjunction with Parameters 51 & 52, defines which
conditions will result in the Alarm 1 output being activated. The
function is that of a Logical “OR”ing of the selected Drive Condition
Flags. A setting of zero defeats this “OR” function entirely. Please see
the sections “Setting and Reading Softswitches” and “Setting Alarm
Conditions” for further details.
