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SDC 1580 SERIES EMLOCK User Manual

Page 3

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P:\INSTALLATION INST\Electromagnetic Locks\INST-1500-10-70-80.vsd REV E 04-06 Page 3

AWG WIRE CHART

To determine the correct wire gauge to use on “one circuit” the following information is required:

1. The quantity, voltage, and current draw of all lock(s) to be used.
2. The distance in feet from the power supply to the furthest lock.

Add together the current draw (amps) of all locks on the same circuit. Cross reference the total amps with the distance between the
power source and the furthest lock to determine the wire gauge required. All wiring must be installed in accordance with all state and
local codes.

Minimum

Wire

Gauge for

12 Volts

AC or DC

AMPS

0.25
0.50
0.75
1.00
1.50
2.00
2.50

DISTANCE IN FEET FROM POWER SOURCE TO FARTHEST LOCKING DEVICE

25

50

75

100

150

200

250

300

400

500

1000

18

18

18

18

18

16

16

14

14

12

18

18

18

16

16

14

12

18

18

16

14

12

12

18

16

14

14

12

18

14

12

12

16

14

12

16

12

Minimum

Wire

Gauge for

24 Volts

AC or DC

AMPS

0.25
0.50
0.75
1.00
1.50
2.00
2.50

25

50

75

100

150

200

250

300

400

500

1000

18

18

18

18

18

18

18

18

16

16

16

18

18

18

18

18

16

16

14

14

12

18

18

18

18

16

14

14

12

12

18

18

16

16

14

14

12

12

18

18

16

14

14

12

18

16

14

14

12

18

16

14

12

DISTANCE IN FEET FROM POWER SOURCE TO FARTHEST LOCKING DEVICE

TROUBLE SHOOTING .

PROBLEM
Emlock releases slowly.
(residual magnetism)

Poor holding force.

No holding force.
Door does not lock.

CAUSE
Control switch wired on AC side of power source.

Field installed diode in parallel with power input.

Armature installed rigidly.

Low voltage.

AC voltage input.
(Emlock will make a humming noise)

No power.

Input polarity reversed.

Open circuit in Emlock coil.

Magnet coil short.

SOLUTION
Control switch must be wired on DC side of power supply.

When an AC transformer and rectifier are used, the control
switch must be wired between the rectifier and the Emlock.

Remove diode.

Armature must pivot loosely from its center mounting point to
permit full armature contact.

Check for proper voltage at the Emlock input. If low,
determine if the correct wire gauge is being used to prevent
excessive voltage drop.

Check power supply load capacity. It must meet or exceed
the combined current rating of all locks on the circuit.

Emlocks require DC input voltage. When AC voltage from a
transformer is used, a full wave bridge rectifier must be
installed to convert the AC voltage to DC voltage.

Check the voltage at the Emlock. If the voltage is low or zero,
double check all wire connections and the power supply.

Check voltage polarity. Terminal (-) is: Negative. Terminal (+)
is: Positive.

Check coil continuity with OHM meter. If reading is high or
open, replace the magnet coil. See Fig. 3A and the
Resistance Specifications.

Coil shorts or incorrect wiring will blow fuses. Measure the coil
for correct resistance. See Fig. 3A and the Resistance
specifications.

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