Banner SC22-3E Safety Controller with Ethernet - Manual (Page 80)

Before connecting the mat to the Safety Controller, verify that the mat and the wiring to the mat does not exceed the maximum
resistance specification using the following procedure.
1. Measure the resistance between wires connected to the same surface of the
mat (see diagram ):
W1 and W2:______A______ ohms
W3 and W4:______B______ ohms
W1 W2 W3 W4
2. While stepping on the mat, measure the resistance between W1 and W3. Repeat the measurement while stepping in various
locations around the mat. Choose the location with the highest reading and record the following measurements.
W1 and W3:______C______ ohms
W2 and W4:______D______ ohms
W2 and W3:______E______ ohms
W1 and W4:______F______ ohms
3. If all measurements (A through F) are less than 20 ohms, the mat and leadwire resistance is acceptable and no further calcu-
lations are needed.
4. If A and B are both less than 300 ohms, the leadwire resistance is acceptable.
5. Calculate the mat resistance: R = E + F - ( A + B + C + D ) / 2
6. If R < 20 ohms, the mat resistance is acceptable.
21. Bypass Function (without Mute)
a. Verify that when the safety input to be bypassed is in the Stop state: The associated Safety Outputs are OFF.
b. Verify that when the bypass input is in the Run state:
• The associated Safety Outputs turn ON.
• The associated Safety Outputs turn OFF when the bypass timer (backdoor timer) expires.
c. Verify that when the bypass switch is in the Stop state and goes back into the Run state: The associated Safety Outputs turn
ON.
d. Generate a stop command from the non-bypassed safeguarding device(s), one at a time. Verify that the associated Safety
Output(s) turns OFF while the input is bypassed.
22. Cancel OFF-delay Function
a. Configure a delayed output and check the box "Allow output to remain ON when off delay is cancelled" in the Advanced
Setting menu. Turn the delayed output ON. Start the delay time by generating a stop command from a safety input, mapped
to the delayed safety output.
• If the Safety Input is a latch input, perform the following steps:
1. Close the Safety Input.
2. Push the Reset button.
3. Activate the Cancel Delay Input.
• If the Safety Input is a trip input, perform the following steps:
1. Close the Safety Input.
2. Activate the Cancel Delay Input.
b. Verify that the delayed safety output stays closed, after the delay time has expired.
c. Configure a delayed output and
do not check the box "Allow output to remain ON when off delay is cancelled" (turn the
output OFF immediately after a Cancel OFF-Delay" signal) in the Advanced Setting menu. Turn the delayed output ON. Start
the delay time by generating a stop command from a safety input, mapped to the delayed safety output.
d. Close the Safety Input again during the OFF-delay time.
• If the Safety Input is configured for manual reset: Verify that the delayed output turns OFF immediately and remains
OFF (a reset signal during the delay time is ignored).
SC22-3/-3E Safety Controller Instruction Manual
80 www.bannerengineering.com - tel: 763-544-3164 P/N 133487 rev. C