10
Installation
CONTROL TERMINAL LISTING
- tightening torque: 0.25 Nm (2.2 lbf.in)
13
RLIP
Relay driver input. Accepts 0 to +/- 10.5 V signal inputs.
The threshold to activate the relay driver is symmetrical around zero. This is set by
the LEVEL preset, b/-0.05 V and +/-10.5 V. When the T13 input exceeds the
positive or negative threshold, then the T12 RELAY DRIVER OUTPUT is turned ON.
Typical uses include zero speed detector, zero current detector, stall detector, etc.
This input will accept any output provided on other control terminals, 50K pull-down
to common.
14
OVLD
Overload. This output goes high (+10.5 V at 10 mA) if the current demand
exceeds 110%, and the stall timer starts timing. Flywheel diode to COM. See T12
RLOP for details of the output drive capability and configuration.
NOTE. OVLD stays high if the overload subsequently results in a stall trip condition.
The stall timer will allow 150% motor current for approximately 30 seconds before
tripping. The overload integrator can tolerate 50% overload x 30 seconds = 1500
units. (A 50% overload is 150% of motor current set on Imax).
Stall timer Operation:
Minimum available overload time prior to trip = 1500 / Overload %, in seconds.
Overload time examples: 125% Imax current for 60 seconds (1500 / 25 = 60)
112.5% Imax current for 120 seconds (1500 / 12.5 =120)
NOTE: The stall timer initiates as a result of the current demand exceeding
100% when the desired speed remains unsatisfied. For example, this may be
due to excessive load, insufficient supply voltage, loss of feedback, saturated
feedback, insufficient torque, jammed shaft. This allows the protection to be more
comprehensive than overcurrent alone.
LM324
+12 V
Output
terminal
Flywheel diode,
47K resistor,
and 47nF
capacitor
10.5 V
LM324
-
+
LM324
-
+
+12 V
+12 V
invert
T13
RLIP
T12
RLOP
Level preset range
0.5% to 105%
Flywheel diode,
47K resistor and
47 nF capacitor
50K
pull-down
This diode allows
relay outputs to be
OR’d together if
desired.
