User Manual

Overview

The SSM-FM-11A.. Safe Speed Monitoring Module ("the Module") can be used to monitor a rotating or laterally moving device's stopping,

starting, or speed. The Module requires signals from two independent sensors.

As a "standstill" (under-speed) monitor, the Module is often used in combination with hard guarding, access doors, and safety gates with

solenoid-lock or -unlock safety switches. When the speed of the monitored device drops below the set switch point (where its speed is no

longer considered dangerous), the Module closes its safety output contacts, applying power to the safety switch solenoid, releasing the

switch lock and enabling the operator to open the safety gate.

In over-speed monitor applications, the N.O. safety contacts are closed for operation (when the motor speed of the monitored device is

below the set switch point). When the speed exceeds the set value, indicating a too-high (dangerous) speed, the safety output contacts

open.

Indicators

Standstill / Under-speed

Monitoring Applications

Over-speed Monitoring Ap-

plications

Figure 1. SSM-FM-11A... features and terminal

locations

1. Power ON (green)

when

Power is applied Power is applied

2. Safety output

channel 1 ON

(green) when

Standstill signal detected on

Input Channel 1

No over-speed detected on

Input Channel 1

2. Safety output

channel 2 ON

(green ) when

Standstill signal detected on

Input Channel 2

No over-speed detected on

Input Channel 2

Operation and Requirements

The Module is redundant and self-checking. It requires digital input signals from two independent input sensors (e.g., proximity switches)

to monitor for either standstill (under-speed) or over-speed conditions.

The input channels are factory pre-adjusted for simultaneity, and a simultaneity potentiometer (behind the Module front cover) is available

to further synchronize the input channel timing. Two banks of DIP switches are also located behind the front cover, for the purpose of

selecting the switch point range; a second potentiometer is used to fine-tune the switch point setting. See Figure, "Module adjustments."

SSM-FM-11A... Safe Speed Monitoring Modules

P/N 140782_web

rev. C