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Model EM-T-7A Extension Module

One- or two-channel control for use with a Primary Safety Device

Printed in USA P/N 54208B0B

Features

• Extension Module provides additional safety outputs for a Primary Safety Device

(for example, an E-stop Safety Module or a 2-hand control module), if controlled

and monitored by this device

• Features four 6-amp switching channels for connection to control-reliable machine

power interrupt circuits

• Four redundant output channels

• Contact status outputs are provided for connection to the Primary Safety Device’s

monitoring input

• 24V dc operation

• Housed in a narrow, 22.5 mm (0.9") DIN-rail-mountable module

• Convenient plug-in terminal blocks

• Design complies with standards UL 991 and EN 60204

Description

The model EM-T-7A Extension Module provides additional forced-guided (positive-

guided) relay contacts for a Primary Safety Device, such as an E-stop Safety Module or

a two-hand-control module. Controlled by the safety outputs of the Primary Safety

Device, the EM-T-7A Extension Module provides four redundant outputs. These outputs

may be connected to control-reliable machine power interrupt circuits. Each of the four

Extension Module outputs is a series connection of two forced-guided relay contacts

(K1 and K2 in Figure 3).

The outputs of the Extension Module follow the action of the safety outputs from the

Primary Safety Device which control it, within a switching delay time of approximately

20 milliseconds. The Extension Module’s four outputs are each rated for up to 250V

ac/dc at up to 6A.

The Extension Module offers an output circuit at terminals Y1 and Y2 which provides

K1 and K2 contact status information for connection to the monitoring input of the

Primary Safety Device (see Figure 3). This monitoring circuit prevents the Primary

Safety Device from being reset if contacts of either K1 or K2 of the Extension Module

fail in a shorted condition.

The Extension Module has indicators for input power (green), and status of internal

relays (K1 and K2, both green) (see Figure 1). There are no adjustments and no user-

serviceable parts. See page 6 for information regarding repair service.

WARNING . . .

This Extension Module is not a point-of-operation guarding device, as defined by OSHA

regulations. It is necessary to install point-of-operation guarding devices, such as safety light curtains and/or

hard guards, to protect personnel from hazardous machinery. Failure to install point-of-operation guards on

hazardous machinery could lead to serious injury or death.

Summary of content (8 pages)

PAGE 1
Model EM-T-7A Extension Module One- or two-channel control for use with a Primary Safety Device Features R R C • Extension Module provides additional safety outputs for a Primary Safety Device (for example, an E-stop Safety Module or a 2-hand control module), if controlled and monitored by this device • Features four 6-amp switching channels for connection to control-reliable machine power interrupt circuits • Four redundant output channels • Contact status outputs are provided for connection to
PAGE 2
Extension Module – Model EM-T-7A ! IMPORTANT NOTICE . . . Read this page before proceeding! Banner Engineering Corp. has made every effort to provide complete application, installation, operation, and maintenance instructions. In addition, any questions regarding the use or installation of this Banner Extension Module should be directed to the factory applications department at the telephone numbers or addresses shown on the back cover.
PAGE 3
Extension Module – Model EM-T-7A Model EM-T-7A Specifications Supply Voltage and Current A1-A2: 24V dc, +/-15%, 10% maximum ripple Supply Protection Circuitry Protected against transient voltages and reverse polarity Output Configuration Four output channels: Each channel is a series connection of two forced-guided (positive-guided) relay contacts – AgNi, gold-flashed Contact ratings: Maximum voltage: 250V ac/dc Maximum current: 6 A ac/dc Minimum current: 30 mA @ 24V dc Maximum power: 1500VA, 200 W Mec
PAGE 4
Extension Module – Model EM-T-7A Installation Primary Safety Device Requirements Model EM-T-7A Extension Module is driven by one or two safety output channels of a Primary Safety Device. The design of the Primary Safety Device must meet OSHA and ANSI control reliability requirements. The EM-T-7A must be used ONLY with Primary Safety Devices which have a dedicated input for feedback monitor contacts (see hookup diagrams).
PAGE 5
Extension Module – Model EM-T-7A ! WARNING . . . L1 Use of Arc Suppressors Machine Control Circuit If arc suppressors are used, they MUST be installed as shown across the actuator coil of the master stop control elements (MSC1 to MSC4). NEVER install suppressors directly across the output contacts of the Extension Module. It is possible for suppressors to fail as a short circuit.
PAGE 6
Extension Module – Model EM-T-7A L1 Machine Control Circuit +24 V dc EM-T-7A A1 13 0 V dc Y1 23 Monitoring Contact Feedback Input K 33 43 Primary Safety Device 14 24 U * 34 Y2 44 Monitoring Contact Feedback Input A2 MSC1 MSC1 MSC2 MSC3 MSC4 NOTE: This hookup is general in nature. Your specific hookup may vary significantly, depending on the Primary Safety Device used and the machine control configuration.
PAGE 7
Extension Module – Model EM-T-7A To satisfy the requirements of control reliability, all MSCs must offer at least one normally closed forced-guided monitor contact. One normally closed monitor contact from each MSC is wired in series to the monitoring contact feedback input of the Primary Safety Device, as shown in Figures 3 and 4. In operation, if one of the switching contacts of any MSC fails in the shorted condition, the associated monitor contact will remain open.
PAGE 8
Extension Module – Model EM-T-7A Periodic Checkout The checkout procedure described on page 7 should be performed according to the intervals specified by the product documentation of the Primary Safety Device controlling this Extension Module. Repairs Do not attempt any repairs to the EM-T-7A Extension Module. It contains no fieldreplaceable components. Return the Extension Module to the factory for warranty repair or replacement.