6-5/8"
8
7
6
8"
4"
1
2
5
3
PLACID
CONSTANT CURRENT
POWER SUPPLY
4
The power supply is suitable for Placid Industries brakes up to 220 lb.-in. & clutches up to 130 lb.-in. torque. The power supply is a
constant current type, with a 3/4 turn potentiometer for setting output current from 0% to 100%. The cutput current can also be
controlled with a 0-10 Volt Input Signal or Follower Arm Potentiometer. The SPAN adjustments set maximum and minimum current
levels.
Input : 120 Volts A.C. 50 / 60 Hz., fused at 1 ampere
Output: PS-12-MC, 0-12 volts D.C., 1.25 amps, 15 watts
PS-24-MC, 0-24 volts D.C., 0.75 amps, 22 watts
Fused at 2 amperes (internal)
0-10 Volt Input Resistance: 2000 ohms
1. % RATED CURRENT potentiometer
2. Current SPAN MAX. potentiometer
3. Current SPAN MIN. potentiometer
4. LED 'Power On' light
5. L.C.D. digital ammeter
6. On underside of case: SWITCH for
Manual (Potentiometer) or
0-10 volt control & Follower control.
7. Terminal Strip for :
1) D.C. Output for brake or clutch coil ( + , - )
2) Ground ( )
3) 0-10 Volt Input Signal ( 0-10v, COM. )
4) Follower Arm Potentiometer
8. A.C. input, A.C. power On/O switch, input fuse
POWER SUPPLY
Specify 12 or 24 Volts D.C.
MODEL: PS - ( voltage ) - MC
SPECIFICATIONS
07-xxx 1/07
Placid Industries
Lake Placid, NY
+
+
COIL OUTPUT (dc)
GREEN
CONTROL
INPUT
FOLLOWER POT
0-10v COM
PLACID
INDUSTRIES
Phone 518 523-2422
www placidindustries.com
P1/4
POWER SUPPLY - PS-MC
INSTRUCTIONS - MANUAL (Potentiometer) CONTROL
MODELS: All enclosed power supplies
COIL OUTPUT (dc) INPUT
+
CONTROL
0-10v COM
FOLLOWER POT
+
GREEN
ADJUSTMENTS - When Using Manual (Potentiometer)
Control:
% RATED CURRENT POTENTIOMETER - To control
output current, from 0% to 100%.
Ground brake or
clutch case to power
supply, if not already
grounded.
SPAN MAX. - Sets the maximum output current. Is a
15 turn potentiometer. Use the miniature plastic
screwdriver provided
to make adjustments.
SPAN MIN. - Sets the output current to zero when the
% RATED CURRENT potentiometer is set to zero. Is a
15 turn potentiometer. Use the miniature plastic
screwdriver provided to make adjustments.
BRAKE OR
CLUTCH
INITIAL SET UP - When Using Manual (Potentiometer) Control:
1) Determine the 100% rated current of the brake (or clutch) from the data sheet, or estimate it from the formula:
100% rated current = (rated voltage) / (coil resistance, ohms)
The rated voltage is listed on the label of the brake or clutch.
2) For safety, disconnect the A.C. power.
3) Set 'SWITCH' (on underside of case) to position 2, 'FRONT PANEL POTENTIOMETER' position, so the output
current is controlled by the % Rated Current Potentiometer.
4) Set the SPAN MAX. potentiometer fully counter-clockwise (for minimum output current).
5) Connect A.C. power.
6) Set the % RATED CURRENT potentiometer to 100% (for maximum output current).
7) SPAN MAX. - Turn the SPAN MAX. potentiometer clockwise until output current equals the 100% rated current of
the brake (or clutch).
8) SPAN MIN. - Set the % RATED CURRENT potentiometer to 10%. Adjust the SPAN MIN. potentiometer until the
output current is 10% of rated current.
9) Recheck Steps 6 - 8.
Placid Industries
1580 Lake St., Elmira, NY 14901, USA Phone 518 523-2422 Fax 518 523-2746
www.placidindustries.com
07-xxx 1/10
P2/4
POWER SUPPLY - PS-MC
INSTRUCTIONS - 0-10 VOLT CONTROL
MODELS: All enclosed power supplies
COIL OUTPUT (dc) INPUT
+
CONTROL
0-10v COM
FOLLOWER POT
+
GREEN
+
Computer
BRAKE
OR
CLUTCH
INITIAL SET UP - When Using 0-10 Volt Control:
or PLC
Ground brake or
clutch case to power
supply, if not already
grounded.
ADJUSTMENTS - When Using 0-10 Volt Control:
0-10 VOLT INPUT SIGNAL - Output current is
proportional to the user's 0-10 volt input signal.
At 0 volts, output current is 0. At 10 volts, output
current is maximum.
SPAN MAX. - This 15 turn potentiometer sets
the maximum output current level.
SPAN MIN. - This 15 potentiometer sets the
output current to zero when the 0-10 volt signal
is zero volts.
1) Determine the 100% rated current of the brake (or clutch) from the data sheet, or estimate it from the formula:
100% rated current = (rated voltage ) / (coil resistance, ohms)
The rated voltage is listed on the label of the brake (or clutch).
2) For safety, disconnect the A.C. power.
3) Set 'SWITCH' (on underside of case) to position 1, '0-10v CONTROL' so the output current is controlled by the
0-10 volt D.C. input signal.
4) Set the SPAN MAX. potentiometer fully counter-clockwise, approximately 15 turns, or until it clicks (for minimum
output current).
5) Connect A.C. power.
6) Set your 0-10 volt signal to 10 volts. (for maximum output current).
7) SPAN MAX. ADJ. - Using the miniature plastic screwdriver, turn the SPAN MAX. potentiometer clockwise until the
output current equals the 100% rated current of the brake (or clutch).
8) SPAN MIN. - Set your 0-10 volt signal to 1 volt. Adjust the SPAN MIN. potentiometer until output current is 10%
of rated current.
9) Recheck Steps 6 - 8.
Placid Industries
1580 Lake St., Elmira, NY 14901, USA Phone 518 523-2422 Fax 518 523-2746
www.placidindustries.com
07-xxx 1/10
P3/4
POWER SUPPLY PS-MC
INSTRUCTIONS - HOW TO REPEATEDLY CYCLE BETWEEN 0 AMPERES & ANY CURRENT LEVEL
DO NOT power up & power down the AC input. DO NOT interrupt the DC output wires.
Output Connector On Rear
Relay
FOLLOWER POT
+
GREEN
+
Computer
or PLC
When using 0 - 10 VOLT CONTROL:
If the signal voltage cannot be brought to 0, then use a switch or
relay to interrupt the 10 volt signal.
When the wire is connected, output current is controlled by the
0-10v signal.
With the wire disconnected, power supply output current is zero.
COIL OUTPUT (dc) INPUT
+
BRAKE
OR
CLUTCH
0-10v COM
CONTROL
Switch or
Contacts
Output Connector On Rear
COIL OUTPUT (dc) INPUT
+
BRAKE
OR
CLUTCH
% Rated Current
Potentiometer
CW
Switch or
Relay
Contacts
Enclosed Models:
Remove case cover
for access to circuit
board & output
connector.
CONTROL
0-10v COM
FOLLOWER POT
+
GREEN
FOLLOWER ARM
POTENTIOMETER
WHITE
YELLOW
ORANGE
CW
Output Connector On Circuit Board
(0v 10+)
Switch or
Relay Contacts
BRAKE
OR
CLUTCH
+
D.C.
OUT
When using a FOLLOWER ARM POTENTIOMETER:
Swing the follower arm into the inactive region. If this is not
possible, then disconnect the wiper using a switch or relay.
When the wire is connected, output current is controlled by the
follower arm potentiometer.
With the wire disconnected, power supply output current is zero.
When using MANUAL (Potentiometer) control:
Use a switch or relay to interrupt the yellow wire to the % Rated
Current Potentiometer (the wire to the wiper).
When the wire is connected, output current is controlled by the
% Rated Current Potentiometer.
With the wire disconnected, power supply output current is zero.
Placid Industries
1580 Lake St., Elmira, NY 14901, USA Phone 518 523-2422 Fax 518 523-2746
www.placidindustries.com
P4/4
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